# CHAPTER 4 EARTHQUAKES

Save this PDF as:

Size: px
Start display at page:

## Transcription

1 CHAPTER 4 EARTHQUAKES Important Concepts 1. An earthquake occurs when movement along a fault zone results in a sudden release of built-up strain energy in the lithosphere. Most earthquakes occur at plate boundaries. 2. The point of first break or movement along a fault is called the earthquake s focus (or hypocenter). The point on the earth s surface directly above the focus is called the epicenter. 3. There are several types of earthquake, or seismic, waves: (a) P (primary) waves are compressional waves that cannot travel through the earth s liquid outer core. (b) S (secondary) waves are shear waves and cannot travel through the earth s core. Both P waves and S waves are classified as body waves, because they travel through the earth's interior. (c) Surface waves travel along the earth s surface, some causing vertical ground motions and others horizontal shearing motions. Much of the structural damage during earthquakes is caused by the surface waves. 4. P waves travel faster than S waves. The difference in the first arrival times of P waves and S waves, as detected by seismographs, is a function of the distance to the earthquake's epicenter. The epicenter of an earthquake can be determined from S P time difference recorded at three or more seismograph stations. 5. The magnitude of an earthquake is a measure of the amount of ground displacement or shaking associated with the earthquake and is usually reported using the Richter magnitude scale (although moment magnitude is a better measure of the released energy). The Richter scale is logarithmic. 6. The intensity of an earthquake is a measure of the damaging effects of an earthquake at a particular location and is usually reported on the Modified Mercalli scale. The damage caused by an earthquake depends not only on its magnitude, but also on other factors, such as the distance from the epicenter, the integrity of the structures and their foundations, and population density. 7. Earthquake-related hazards include: (a) Ground shaking and fault displacement. (b) Ground failures, including landslides and liquefaction. Liquefaction is a quicksand condition arising in wet soil shaken by seismic waves. (c) Tsunamis, or seismic sea waves, and coastal flooding. (d) Fires caused by fuel line and storage tank ruptures and electrical system damage. 8. Some progress in earthquake prediction and forecasting has been made by recognizing the presence of seismic gaps and by studying precursor phenomena and earthquake cycles. Unfortunately, it is not yet possible to precisely predict the timing, size, or precise location of a future major earthquake. 25

2 9. It may be possible to induce the generation of small earthquakes by injecting fluids into locked sections of major faults and thus prevent the occurrence of major earthquakes. Although attractive in principle, the concept has not been tested yet because of potential technical, legal, and political problems. 10. Although we cannot control earthquakes, improved earthquake prediction and forecasting, heightened public awareness of earthquake phenomena and hazards, the development of comprehensive disaster-response plans, and proper land-use and engineering practices can reduce the risk of loss of life and property damage caused by earthquakes. 11. Areas of recognized earthquake risk in the United States include southern Alaska, the western states, the Midwest along the New Madrid fault zone, and sections of the east coast. Canada, although less active seismically than the United States, still has the potential for significant earthquakes. Key Terms aftershocks body waves creep earthquake earthquake cycle elastic rebound epicenter fault focus intensity liquefaction magnitude Modified Mercalli Scale moment magnitude precursor phenomena P waves Richter magnitude scale seismic gap seismic waves seismograph S waves surface waves tsunami Multiple Choice 1. Slow, gradual movement along a fault is called a. slip. b. creep. c. elastic rebound. d. liquefaction. 2. The point of first break on a fault during an earthquake is called the a. slip. b. epicenter. c. point of weakness. d. focus. 3. Earthquakes originate in the a. lithosphere. b. asthenosphere. c. mantle. d. outer core. 26

3 4. Earthquake P waves a. travel more slowly than S waves. b. are a type of surface wave. c. cannot pass through the earth's core. d. are compressional waves. 5. Which of the following is not explained by the elastic rebound theory? a. the generation of earthquakes along fault zones b. the likely recurrence of earthquakes along the same fault zone c. the concept of seismic gap d. the common occurrence of fires in earthquake-affected communities 6. At present, we can predict a. the regions where major earthquakes are likely to occur in the future. b. the year in which a major earthquake will occur along the San Andreas fault zone. c. the precise magnitude of an earthquake if and when it occurs. d. the likelihood of strange animal behavior before the next earthquake along the New Madrid fault zone. 7. In the United States, earthquake intensity is usually measured on the a. Richter magnitude scale. b. Modified Mercalli Scale. c. Seismic Intensity Scale. d. Destruction Magnitude Scale. 8. Relative to an earthquake of magnitude 5 on the Richter magnitude scale, an earthquake of magnitude 7 releases a. 2 times more energy. b. 20 times more energy. c. 100 times more energy. d. 900 times more energy. 9. An earthquake having a magnitude of would be described as a a. minor earthquake. b. damaging earthquake. c. destructive earthquake. d. major earthquake. 10. The problem of liquefaction can be somewhat reduced by a. injecting lubricating fluids into the soil to reduce the friction between soil particles. b. installing efficient underground drainage systems. c. compacting the soil as much as possible. d. constructing earthquake-resistant buildings in areas prone to liquefaction. 11. Tsunamis a. are generated by tidal action. b. appear as high breakers in the open ocean. c. pose little threat to coastal areas. d. can travel at speeds of hundreds of miles per hour. 27

4 12. Seismic gaps represent a. periods of reduced or no seismic activity in the geologic record. b. locked sections along otherwise active faults. c. areas where there is little or no risk of earthquake activity. d. areas along an active fault where surface indications of the fault are absent. 13. Which of the following is an example of an earthquake precursor? a. an increase then a decrease in the electrical resistivity of rocks. b. changes in water levels in wells. c. anomalous animal behavior. d. All of the above are possible precursor phenomena. 14. The agency of the United States government authorized to issue warnings of impending earthquakes and other hazardous geologic events is the a. National Academy of Sciences. b. U.S. Department of the Interior. c. U.S. Geological Survey. d. Environmental Protection Agency. 15. At present, all of the following nations have government-sponsored earthquake prediction programs except a. Mexico. b. the United States. c. Japan. d. the People's Republic of China. 16. Which one of the following states has the greatest risk of experiencing a severely damaging earthquake? a. Texas b. South Carolina c. Michigan d. Colorado Fill In the Blanks 1. The phenomenon in which rocks snap back elastically to their prestress condition after an earthquake is called. 2. The point on the earth s surface directly above the focus of an earthquake is called the. 3. When an earthquake occurs, it releases energy in the form of, which are divided into body waves and surface waves. 4. are body waves that involve a side-to-side motion of molecules of the materials through which they travel. 5. The instrument that is used to detect the ground motions generated by earthquakes is called a. 6. is a measure of the damaging effects of an earthquake on surface features and on humans. 7. Earthquakes that follow the main shock are called. 28

5 8. An earthquake of Richter magnitude 6 causes times as much ground movement as one of Richter magnitude are events that precede an earthquake and can be used to predict its occurrence. 10. A method of releasing built-up strain along locked sections of faults by pumping fluid into fault zones is called. True or False Indicate whether the following statements are true or false. If false, correct the statement to make it true. 1. Deep-focus earthquakes are concentrated in subduction zones. 2. When an earthquake occurs, S waves from the quake are detected all over the earth. 3. As S waves travel through matter, the matter is alternately compressed and expanded. 4. The farther a receiving seismograph is from an earthquake s epicenter, the shorter the time lag between the first arrival of P waves and S waves. 5. Calculation of the Richter magnitude of an earthquake is based on the maximum amplitude of seismic waves recorded on the seismogram and adjusted for the distance of the seismograph from the epicenter. 6. Earthquakes are extremely rare events. 7. On the Modified Mercalli Scale, an earthquake of intensity I is the most destructive. 8. Buildings constructed on deep soil usually suffer less structural damage than those built on bedrock. 9. During the 1906 San Francisco earthquake, 70% of the damage was due to fire rather than to ground movement. 10. It is now possible to predict the timing and size of major earthquakes. 11. If you are indoors during an earthquake, run outdoors immediately. 29

6 12. The 1989 Loma Prieta earthquake has increased, not reduced, the near-term likelihood of failure along the peninsular segment of the San Andreas fault. Review Questions 1. What are the different types of seismic waves associated with an earthquake? Which of these is likely to cause most damage to buildings? 2. Explain the difference between the Richter magnitude of an earthquake and its intensity based on the Mercalli Scale. Which of these is a better gauge of the energy released during an earthquake? 3. What are the factors that determine the damage (loss of life and property) caused by an earthquake? 4. What is the correlation between plate tectonics and the distribution of earthquakes? Why are deep-focus earthquakes concentrated along subduction zones? 5. At the present time, how well can we predict future earthquakes in terms of their likely location and timing? Explain your answer. 6. List at least three kinds of earthquake-related hazards, and describe what, if anything, can be done to minimize the danger that each poses. 7. Explain the concept of minimizing the risk of a major earthquake by artificially producing smaller earthquakes along the San Andreas fault zone. Surfing the Net Excellent, comprehensive treatment of earthquakes and related hazards, with links to many other sources (National Earthquake Information Center, U.S. Geological Survey): <http://wwwneic.cr.usgs.gov/ Global seismic risk maps (final report of the Global Seismic Hazard Assessment Program, 1999): <http://seismo.ethz.ch/gshap> Excellent collection of images of photographs and artworks related to many earthquakes and information on earthquake engineering (The National Information Service for Earthquake Engineering): <http://nisee.berkeley.edu/> Information on tsunamis, especially the 1998 Papua New Guinea tsunami (U.S. Geological Survey): <http://walrus.wr.usgs.gov/tsunami/index.html> Information on hazards related to earthquakes, especially those applicable to the San Francisco Bay area (The Association of Bay Area Governments): <http://www.abag.ca.gov/bayarea/eqmaps/eqmaps.html> Research relevant to plate tectonics and earthquakes (The Geological Survey of Japan): <http://www.gsj.go.jp> 30

7 CHAPTER 4 ANSWER KEY Multiple Choice 1. b 2. d (figure 4.4) 3. a 4. d 5. d 6. a 7. b 8. d 9. b (table 4.2) 10. b 11. d 12. b 13. d 14. c 15. a 16. b (figure 4.31) Fill In the Blanks 1. elastic rebound 2. epicenter 3. seismic waves 4. S waves 5. seismograph 6. Intensity 7. aftershocks Precursor phenomena 10. fluid injection True or False 1. True 2. False. S waves do not reach the part of the earth on the opposite side from an earthquake because they cannot travel through the liquid outer core. 3. False. S waves are shear waves that involve a side-to-side motion of molecules as they travel through the earth. P waves involve back-and-forth vibrations or compression of molecules in the direction of wave travel. 4. False. The farther a receiving seismograph is from an earthquake s epicenter, the greater the time lag between the first arrival of P waves and S waves. 5. True 6. False. Hundreds of thousands of earthquakes of all magnitudes occur each year, although most are magnitude 5 or less (table 4.2). 7. False. An intensity of XII is the most destructive on the Modified Mercalli Scale (table 4.3). 8. False. Buildings constructed on deep soil usually suffer more structural damage than those built on bedrock. 9. True 10. False. Partly because earthquake precursors are not yet completely understood, consistently reliable earthquake predictions are at least a decade or more in the future. 11. False. Remain indoors during an earthquake, seeking protection beneath a table or desk, or in a doorway. 12. True 31

### Earthquakes. Earthquakes: Big Ideas. Earthquakes

Earthquakes Earthquakes: Big Ideas Humans cannot eliminate natural hazards but can engage in activities that reduce their impacts by identifying high-risk locations, improving construction methods, and

### Unit 13: Earthquakes

Unit 13: Earthquakes A. Earthquakes 1. Earthquake vibration of Earth produced by the rapid release of energy 2. Focus The point within Earth where the earthquake starts 3. Epicenter Location on the surface

### 3. When an earthquake occurs, energy radiates in all directions from its source, which is called the. a. epicenter c. fault b. focus d.

NAME EARTH SCIENCE CHAPTER 8 1. A fault is. a. a place on Earth where earthquakes cannot occur b. a fracture in the Earth where movement has occurred c. the place on Earth s surface where structures move

### Earthquake: A vibration caused by the sudden breaking or frictional sliding of rock in the Earth. Fault: A fracture on which one body of rock slides

Earthquake: A vibration caused by the sudden breaking or frictional sliding of rock in the Earth. Fault: A fracture on which one body of rock slides past another. Focus: The location where a fault slips

Earthquakes Table of Contents Section 1 What Are Earthquakes? Section 2 Earthquake Measurement Section 3 Earthquakes and Society http://youtu.be/lcvwan8w-jo http://youtu.be/xe7mfz8dnjw Section 1 What Are

### Earthquakes and Volcanoes

Earthquakes and Volcanoes Earthquakes What are earthquakes? Imagine bending a stick until it breaks. When the stick snaps, it vibrates, releasing energy. Earthquakes release energy in a similar way. Earthquakes

### Section 8.1 What Is an Earthquake? This section explains what earthquakes and faults are and what causes earthquakes.

Section 8.1 What Is an Earthquake? This section explains what earthquakes and faults are and what causes earthquakes. Reading Strategy Building Vocabulary As you read this section, write a definition for

### Seismic Earthquakes. The most common quakes occur from fault lines

Earthquakes GE 4150- Natural Hazards Slides and images taken from Dr. Jim Diehl, Jason R. Evans, Joanne M. Scott and Benfiled Greig Hazard Research Centre (C471 Geohazards) Tectonic Earthquakes Seismic

### Unit 4 Lesson 6 Measuring Earthquake Waves. Copyright Houghton Mifflin Harcourt Publishing Company

Shake, Rattle, and Roll What happens during an earthquake? As plates of the lithosphere move, the stress on rocks at or near the edges of the plates increases. This stress causes faults to form. A fault

### Chapter 5: Earthquakes

Chapter 5: Earthquakes 1. Experiencing an Earthquake firsthand 2. The Science of Ghost Forests and Megaearthquakes 3. Faults, Earthquakes, and Plate Tectonics 4. Seismic Waves and Earthquake Detection

### Tennessee. Earthquakes Good and Bad. The Bad: Cause significant injury, destruction of property, and loss of life. West New Madrid Seismic Zone

Earthquakes Good and Bad The Bad: Cause significant injury, destruction of property, and loss of life The Good: Energy released during earthquakes (seismic energy) provides much information about Earth

### EARTHQUAKE PREDICTION

Lecture 15 Earthquake Prediction EARTHQUAKE PREDICTION To successfully predict an earthquake we would like to know:- PLACE TIME MAGNITUDE (rather like a weather forecast) 1 Evidence must be integrated

### What is an earthquake?

Earthquakes and structural damage (and nifty examples of geophysical forensics) What is an earthquake? An earthquake is the vibration of Earth produced by the rapid release of energy Energy released radiates

### Earthquakes and the Earth s Interior

Earthquakes and the Earth s Interior San Francisco 1906 Magnitude 7.8 Charleston 1886 California s Notorious San Andreas Fault fault trace Earthquakes are the release of energy stored in rocks. Most earthquakes

### Geotechnical Earthquake Engineering

Geotechnical Earthquake Engineering by Dr. Deepankar Choudhury Professor Department of Civil Engineering IIT Bombay, Powai, Mumbai 400 076, India. Email: dc@civil.iitb.ac.in URL: http://www.civil.iitb.ac.in/~dc/

### A Violent Pulse: Earthquakes

A Violent Pulse: Earthquakes What is an Earthquake? Earth shaking caused by a rapid release of energy. tectonic stress build up rock break. energy moves outward as an expanding sphere of waves. waveform

### Earthquake Hazards and Risks

Page 1 of 7 EENS 3050 Tulane University Natural Disasters Prof. Stephen A. Nelson Earthquake Hazards and Risks This page last updated on 28-Aug-2013 Earthquake Risk Many seismologists have said that "earthquakes

### Earth and Space Science. Semester 2 Exam Review. Part 1. - Convection currents circulate in the Asthenosphere located in the Upper Mantle.

Earth and Space Science Semester 2 Exam Review Part 1 Convection -A form of heat transfer. - Convection currents circulate in the Asthenosphere located in the Upper Mantle. - Source of heat is from the

### Glossary. continental crust: the sections of crust, the outermost layer of the earth, that include the continents

aftershock: an earthquake that follows a larger earthquake or main shock and originates in or near the rupture zone of the larger earthquake. Generally, major earthquakes are followed by a number of aftershocks

### 14. Print out the page that shows your Virtual Seismologist Certificate and ANSWERS 15. After getting all 4, turn it into the teacher.

The Process 1. Go to the website: http://www.sciencecourseware.org 2. Click on: GEOLOGY LABS ONLINE 3. Click on VIRTUAL EARTHQUAKE 4. NEXT click on: NEW: A completely revised version of Virtual Earthquake

### Name Date Class. By studying the Vocabulary and Notes listed for each section below, you can gain a better understanding of this chapter.

CHAPTER 7 VOCABULARY & NOTES WORKSHEET Earthquakes By studying the Vocabulary and Notes listed for each section below, you can gain a better understanding of this chapter. SECTION 1 Vocabulary In your

### Seismic Waves Practice

1. Base your answer to the following question on the diagram below, which shows models of two types of earthquake waves. Model A best represents the motion of earthquake waves called 1) P-waves (compressional

### Earthquake, its causes, classification, seismic zones of India and geological consideration for construction of building, projects in seismic areas.

Earthquake, its causes, classification, seismic zones of India and geological consideration for construction of building, projects in seismic areas. An earthquake is a sudden vibration of earth surface

### PRINCIPLES OF EARTH SCIENCE. Prof. Gillian R. Foulger

PRINCIPLES OF EARTH SCIENCE EARTHQUAKES & SEISMIC HAZARD Prof. Gillian R. Foulger Recommended reading Books Bolt, Bruce, Earthquakes, W.H. Freeman, 4th edition, ISBN: 01339X, 320 pp, 1999. Stein, S. and

### NATURAL HAZARDS & NATURAL DISASTERS

NATURAL HAZARDS & NATURAL DISASTERS The World is always changing. Natural disasters are changes which are so great they may cause damage to the shape of the land or to the lives of people and other living

### Volcanoes and Earthquakes. Part 1: Volcanoes

Volcanoes and Earthquakes Part 1: Volcanoes Introduction Earth s crust is made of cool, solid rock. Yet, most of Earth is made of extremely hot rock in the mantle and liquid metal in the core. Sometimes,

### P-wave compression. propagating wave

Did you feel it? That side to side, up and down, ground-shaking motion felt by many Californians every year, not to mention folks all around the world. The shaking motion is referred to as an earthquake,

### FOURTH GRADE EARTHQUAKES 1 WEEK LESSON PLANS AND ACTIVITIES

FOURTH GRADE EARTHQUAKES 1 WEEK LESSON PLANS AND ACTIVITIES PLATE TECTONIC CYCLE OVERVIEW OF FOURTH GRADE VOLCANOES WEEK 1. PRE: Comparing different structures of volcanoes. DURING: Modeling three types

### Magnitude 7.7 SOLOMON ISLANDS

A 7.7 magnitude earthquake struck offshore in the Solomon Islands. The earthquake occurred less than 30 kilometers off the island of Makira, at a depth of 48.7 km (30.3 miles), and 70 kilometers southwest

### EARTHQUAKES. Tommy Her, Ben Lee, James Edwards, Chandler Collier, Brent Dorn, and April Bartholomew (photographer)

EARTHQUAKES Tommy Her, Ben Lee, James Edwards, Chandler Collier, Brent Dorn, and April Bartholomew (photographer) Introduction to Physical Science, EMPACTS Project C. Dianne Phillips, Instructor, NWACC,

### EARTHQUAKES. Compressional Tensional Slip-strike

Earthquakes-page 1 EARTHQUAKES Earthquakes occur along faults, planes of weakness in the crustal rocks. Although earthquakes can occur anywhere, they are most likely along crustal plate boundaries, such

### Sound Waves and Seismic Waves

Sound Waves and Seismic Waves Seismologists record and analyze waves to determine where an earthquake occurred and how large it was Waves are fundamental to music and seismology Similarities: More high

### Earth Science Chapter 8 Section 2 Review

Name: Class: Date: Earth Science Chapter 8 Section 2 Review Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Which seismic waves travel most rapidly? a.

### Earthquakes and Volcanoes

chapter 38 Earthquakes and Volcanoes section 1 Earthquakes Before You Read Have you ever experienced an earthquake or perhaps seen an earthquake in a movie or on TV? On the lines below, describe an earthquake.

### Instructor: Ms. Terry J. Boroughs Geology 305 Restless/Dynamic EARTH: Geologic Structures (Folds & faults); Earthquakes; and the Earth s Interior

DATE DUE: Instructor: Ms. Terry J. Boroughs Geology 305 Name: Restless/Dynamic EARTH: Geologic Structures (Folds & faults); Earthquakes; and the Earth s Interior Instructions: Read each question carefully

### THE 2004 SUMATRA EARTHQUAKE AND INDIAN OCEAN TSUNAMI: WHAT HAPPENED AND WHY

Page 6 The Earth Scientist THE 2004 SUMATRA EARTHQUAKE AND INDIAN OCEAN TSUNAMI: WHAT HAPPENED AND WHY Seth Stein and Emile A. Okal Dept of Geological Sciences, Northwestern University, Evanston Illinois

### THIRD GRADE EARTHQUAKES 1 WEEK LESSON PLANS AND ACTIVITIES

THIRD GRADE EARTHQUAKES 1 WEEK LESSON PLANS AND ACTIVITIES PLATE TECTONIC CYCLE OVERVIEW OF THIRD GRADE VOLCANOES WEEK 1. PRE: Explaining why there are many types of volcanic rocks. LAB: Comparing rocks

### stress the amount of force per unit area that acts on a rock strain any change in a rock's shape or volume caused by stress Faults

----------------------------- -------- ------- Section 1 Review! deformation the bending, tilting, and breaking of Earth's crust; the change in the shape of rock in response to stress: fault a break in

### Name Crustal Interactions E-Science Date Midterm Review Science Department

Name Crustal Interactions E-Science Date Midterm Review Science Department 1 Base your answer to the following question on the cross section below, which shows the paths of seismic waves traveling from

### Lecture 12 Earthquake Magnitude

Lecture 12 Earthquake Magnitude Locating Earthquakes Last time, we learned that we could obtain a rough estimate of the distance in miles to an earthquake epicenter by multiplying the S - P time interval

### Lesson Plan: Earthquakes

Lesson Plan: Earthquakes Lesson Plan: Earthquakes Lesson Plan Content: This lesson plan and slide presentation is to be used in conjunction with: 1 x earthquakes teacher briefing 1 x earthquakes teacher

### Magnitude 7.2 GUERRERO, MEXICO

A powerful magnitude-7.2 earthquake shook central and southern Mexico on Friday. The earthquake occurred at a depth of 24 km (15 miles). Its epicenter was in the western state of Guerrero, near the seaside

### Chapter 7 Earthquake Hazards Practice Exam and Study Guide

Chapter 7 Earthquake Hazards Practice Exam and Study Guide 1. Select from the following list, all of the factors that affect the intensity of ground shaking. a. The magnitude of the earthquake b. Rather

### Investigation 3: Seismic Waves

Investigation 3: Seismic Waves Table of Contents: Folder 1: Seismic Waves... 25 Folder 2: Locating Earthquakes... 26 Folder 3: Exploring Earth s Interior... 29 Investigation Summary... 32 Folder 1: Seismic

### Magnitude 7.1 PAPUA NEW GUINEA

(Reuters) A major earthquake struck the Pacific state of Papua New Guinea Wednesday afternoon 89 km (55 miles) SSW of Lae, New Guinea, but no tsunami warning was issued as the quake occurred inland, and

### 8-3.1 Summarize the three layers of Earth crust, mantle, and core on the basis of relative position, density, and composition.

Earth s Structure and Processes 8-3 The student will demonstrate an understanding of materials that determine the structure of Earth and the processes that have altered this structure. 8-3.1 Summarize

### Teacher Workbooks. Science and Nature Series Cloze Paragraphs Natural Disasters Theme, Vol. 1

Teacher Workbooks Science and Nature Series Cloze Paragraphs Natural Disasters Theme, Vol. 1 Copyright 2005 Teachnology Publishing Company A Division of Teachnology, Inc. For additional information, visit

### Earth. Earthquake Generation. A Violent Pulse: EARTHQUAKES! Chapter 10 CE/SC Portrait of a Planet Fifth Edition

CE/SC 10110-20110 A Violent Pulse: EARTHQUAKES! Earth Portrait of a Planet Fifth Edition Chapter 10 San Francisco Bay Area Earthquake Generation Brittle Deformation Bending = stress build up Break = energy

### Earthquakes and Seismic Waves ;Everything You need to know

Earthquakes and Seismic Waves ;Everything You need to know What Are Plate Tectonics? Seismic Zones Recycling of Crustal Material What is an earthquake? What are Seismic Waves? Magnitude and Intensity of

### Name: Date: Class: Finding Epicenters and Measuring Magnitudes Worksheet

Example Answers Name: Date: Class: Finding Epicenters and Measuring Magnitudes Worksheet Objective: To use seismic data and an interactive simulation to triangulate the location and measure the magnitude

### Name: Lab: Earthquake Epicenters Adapted from Exploration in Earth Science, The Physical Setting, United Publishing Company, Inc

Name: Lab: Earthquake Epicenters Adapted from Exploration in Earth Science, The Physical Setting, United Publishing Company, Inc INTRODUCTION: Earthquakes occur when there is movement along a fault. The

### How do scientists measure earthquakes?

Name: Source: http://www.scholastic.com/browse/article.jsp?id=4892 http://gizmodo.com/5833688/what-do-earthquake-magnitudes-mean http://www.kids-fun-science.com/moment-magnitude-scale.html http://tremor.nmt.edu/faq/how.html

### EARTHQUAKES AND SEISMOLOGY

EARTHQUAKES AND SEISMOLOGY Seismology is the study of earthquakes and seismic waves. Seismologists are concern with minimizing earthquakes destructiveness. They do this by assessing seismic risk in different

### Earthquakes and Seismic Waves (pages 51 57)

Earthquakes and Seismic Waves (pages 51 57) Types of Seismic Waves (pages 52 53) Key Concept: Seismic waves carry energy from an earthquake away from the focus, through Earth s interior, and across the

### Earthquakes. www.earthquakes.bgs.ac.uk

Earthquakes www.earthquakes.bgs.ac.uk Introduction Earthquakes are among the most deadly natural hazards. There are around 100 earthquakes each year of a size that could cause serious damage. They strike

### II. Earth Science (Geology) Section (9/18/2013)

EAPS 100 Planet Earth Lecture Topics Brief Outlines II. Earth Science (Geology) Section (9/18/2013) 1. Interior of the Earth Learning objectives: Understand the structure of the Earth s interior crust,

### Soil Dynamics Prof. Deepankar Choudhury Department of Civil Engineering Indian Institute of Technology, Bombay

Soil Dynamics Prof. Deepankar Choudhury Department of Civil Engineering Indian Institute of Technology, Bombay Module - 3 Wave Propagation - Earthquake waves Lecture - 17 P-waves, S-waves, 3 circle method,

### ASTRONOMY 161. Introduction to Solar System Astronomy. Class 15

ASTRONOMY 161 Introduction to Solar System Astronomy Class 15 The Earth Monday, February 12 The Earth: Physical characteristics Mass = 5.97 10 24 kg Mean radius = 6,373 km Polar radius = 6,357 km Density

### Geography Chapter 2 A Living Planet

Geography Chapter 2 A Living Planet The Earth Inside and Out pp.27 47 Bodies of Water and Land Forms pp. 32-36 Internal Forces Shaping the Earth pp.37-41 External Forces Shaping the Earth pp. 42-45 1.

### The Severity of an Earthquake - ---- U.S. Department of the Interior/Geological Survey

The Severity of an Earthquake - ---- U.S. Department of the Interior/Geological Survey ----~ Earthquakes can be measured in terms of either the effect of the earthquake (intensity) or of the energy released

### EARTHQUAKE MAGNITUDE

EARTHQUAKE MAGNITUDE Earliest measure of earthquake size Dimensionless number measured various ways, including M L local magnitude m b body wave magnitude M s surface wave magnitude M w moment magnitude

### 4 Deforming the Earth s Crust

CHAPTER 4 4 Deforming the Earth s Crust SECTION Plate Tectonics BEFORE YOU READ After you read this section, you should be able to answer these questions: What happens when rock is placed under stress?

### Geotechnical Earthquake Engineering

Geotechnical Earthquake Engineering by Dr. Deepankar Choudhury Professor Department of Civil Engineering IIT Bombay, Powai, Mumbai 400 076, India. Email: dc@civil.iitb.ac.in URL: http://www.civil.iitb.ac.in/~dc/

### Tectonic processes. 2.1 Where do earthquakes and volcanoes occur?

2 Tectonic processes In this chapter you will study: how the Earth s crust is broken into different types of tectonic s what type of tectonic activity occurs at the boundaries what can happen during earthquakes

### Class Notes: Plate Tectonics

Name: Date: Period: Tectonics The Physical Setting: Earth Science Class Notes: Tectonics I. Continental Drift Continental Drift -! Pangaea -! Alfred Wegener (1915) German and Proposed the theory of! Hypothesized

### Chapter 9 Earthquakes and Volcanism

Chapter 9 Earthquakes and Volcanism I. Earth s Surface Relief II. Orogenesis III. Earthquakes A. What is an earthquake B. Anatomy of an Earthquake C. Measuring Earthquakes D. Tsunamis Earth s Hypsometry

### EARTHQUAKES STRESS. Harjit Singh

EARTHQUAKES Induced by STRESS Harjit Singh Stress is one of the most destructive forces in nature. We all know the negative impacts that stress can have on humans. But what happens when rocks on continents

1 of 37 http://www.youtube.com/watch?v=c0ya4_snbru 2 of 37 What are earthquakes? Earthquakes Earthquakes are vibrations caused by earth movements at plate boundaries and at major fault lines (cracks in

### Earth Science: Earthquakes Teacher s Guide

Teacher s Guide Grade Level: 6 8 Curriculum Focus: Earth Science Lesson Duration: 3 class periods Program Description It may seem as if we re all on solid ground, but that ground is in constant motion,

### Earthquake Preparedness Tips & Strategies

Earthquake Preparedness Tips & Strategies What to Do BEFORE an Earthquake What to Do DURING an Earthquake BE PREPARED! For more information, log onto: www.gema.ga.gov www.ready.ga.gov www.geophysics.eas.gatech.edu

### Locating the Epicenter and Determining the Magnitude of an Earthquake

Locating the and Determining the Magnitude of an Earthquake Locating the Measuring the S-P time interval There are hundreds of seismic data recording stations throughout the United States and the rest

### Exam 2 review Earth Science 2 Exam on April 8th

1. How is Earth organized? A. Earth has an inner and outer core, a mantle, and a crust. B. Earth has an inner mantle and an outer lithosphere. with a liquid inner core. C. Earth's crust rests atop the

### The first wave to reach the surface in an earthquake is the primary

4 The first wave to reach the surface in an earthquake is the primary wave (P-wave), which is a type of compression or longitudinal wave. A longitudinal wave is one that transfers energy through compressions

### Earthquakes. www.earthquakes.bgs.ac.uk. Seismograph stations operated by the British Geological Survey

Seismograph stations operated by the British Geological Survey Earthquakes Photograph supplied by Andy Thompson, Arup Advanced Technology, EEFIT Mission www.earthquakes.bgs.ac.uk Introduction Earthquakes

### The Dynamic Crust 2) EVIDENCE FOR CRUSTAL MOVEMENT

The Dynamic Crust 1) Virtually everything you need to know about the interior of the earth can be found on page 10 of your reference tables. Take the time to become familiar with page 10 and everything

### GEO 101: PHYSICAL GEOGRAPHY Chapter 12: Tectonics, Earthquakes, and Volcanism

GEO 101: PHYSICAL GEOGRAPHY Chapter 12: Tectonics, Earthquakes, and Volcanism Earth s Topographic Regions Crustal Formation Processes Crustal Deformation Processes Orogenesis (Mountain Building) Earthquakes

### Seismic Waves. Epicenter and Focus. Focus. The shaking occurs as the energy travels out. form of waves (like ripples in water). Epicenter.

Seismic Waves When there is movement at a fault, energy is released: The shaking occurs as the energy travels out from the focus in the form of waves (like ripples in water). Epicenter and Fault Line Epicenter

### Earthquakes Redpath Museum, McGill University

Earthquakes Redpath Museum, McGill University www.wikipedia.org: public domain or licensed under a Creative Commons Attribution Share-Alike 3.0 License Earthquakes Parts of the Earth are always moving,

### DYNAMIC CRUST: Unit 4 Exam Plate Tectonics and Earthquakes

DYNAMIC CRUST: Unit 4 Exam Plate Tectonics and Earthquakes NAME: BLOCK: DATE: 1. Base your answer to the following question on The block diagram below shows the boundary between two tectonic plates. Which

### Earthquakes: Risk and Insurance Issues

Page 1 of 8 HOT TOPICS & INSURANCE ISSUES Earthquakes: Risk and Insurance Issues THE TOPIC JULY 2003 An earthquake is a sudden and rapid shaking of the earth caused by the breaking and shifting of rock

### Magnitude 8.8 OFFSHORE MAULE, CHILE

A great 8.8-magnitude struck central Chile early Saturday. The quake hit 200 miles (325 kilometers) southwest of the capital Santiago. The epicenter was just 70 miles (115 kilometers) from Concepcion,

### Presentations. Session 1. Slide 1. Earthquake Risk Reduction. 1- Concepts & Terminology

Earthquake Risk Reduction Presentations Session 1 Slide 1 Earthquake Risk Reduction 1- Concepts & Terminology Welcome to the World Bank Institute s (WBI) Distance Learning (DL) course on Earthquake Risk

### Earthquakes and the Earth's Interior

Page 1 of 24 EENS 1110 Tulane University Physical Geology Prof. Stephen A. Nelson Earthquakes and the Earth's Interior This page last updated on 24-Sep-2015 Earthquakes Earthquakes occur when energy stored

### Name Period. Earth Science Regents

Earth Science Regents Name Period THE DYNAMIC CRUST There are 4 major sub-divisions to the Earth s interior: 1. The Crust a. it s thickness varies from 5 to 60 kilometers b. continental crust is thicker,

### Regents Questions: Plate Tectonics

Earth Science Regents Questions: Plate Tectonics Name: Date: Period: August 2013 Due Date: 17 Compared to the oceanic crust, the continental crust is (1) less dense and more basaltic (3) more dense and

### 89.325 Geology for Engineers Earthquakes

89.325 Geology for Engineers Earthquakes Name I. Introduction The crust of the earth behaves in a brittle manner. Stress is the force applied to a brittle substance and strain represents the build-up of

### SEISMIC THREAT TO THE ST. LOUIS AREA POSED BY THE NEW MADRID SEISMIC ZONE

BRIEF OVERVIEW OF SEISMIC THREAT TO THE ST. LOUIS AREA POSED BY THE NEW MADRID SEISMIC ZONE J. David Rogers, Ph.D., P.E., R.G., C.E.G. Karl F. Hasselmann Chair in Geological Engineering Natural Hazards

### What are external geologic processes?

ES 10 September 27 th 2012 Geologic Processes and Hazards Geology: scientific study of Earth s materials and processes Materials: Processes: external & internal (we ll see a list soon) Geologic Processes

### Unit 6 Earthquakes and Volcanoes

Unit 6 Earthquakes and Volcanoes Earthquakes and Volcanoes: Essential Questions What evidence can students observe that the Earth is changing? How do scientists know what s inside the Earth? What processes

### Answers: Internal Processes and Structures (Plate Tectonics)

Answers: Internal Processes and Structures (Plate Tectonics) 1. Outline evidence for lithospheric plate motion and continental drift. The continental coastlines fit together well. Similar fossils, glacial

### FOURTH GRADE PLATE TECTONICS 1 WEEK LESSON PLANS AND ACTIVITIES

FOURTH GRADE PLATE TECTONICS 1 WEEK LESSON PLANS AND ACTIVITIES PLATE TECTONIC CYCLE OVERVIEW OF FOURTH GRADE VOLCANOES WEEK 1. PRE: Comparing different structures of volcanoes. LAB: Modeling three types

### What's Shakin': Earthquake Research at Bridgewater

Bridgewater Review Volume 23 Issue 1 Article 6 Jun-2004 What's Shakin': Earthquake Research at Bridgewater Robert C. Cicerone Bridgewater State College, rcicerone@bridgew.edu Recommended Citation Cicerone,

### February 28 Earthquake: We got off easy

February 28 Earthquake: We got off easy State Geologist John Beaulieu Lucky may not be the first word that comes to mind after an earthquake that injured more than 200 and caused more than \$1 billion damage,

### The Sendai Earthquake an update

Geography Today The Sendai Earthquake an update Professor David Petley Executive Director, Institute of Hazard, Risk and Resilience, Durham University, United Kingdom Email: d.n.petley@durham.ac.uk Why

### Continental Drift: An Idea Before Its Time

Continental Drift: An Idea Before Its Time Alfred Wegener (1880 1930) Continental drift hypothesis: The world's continents are in motion and have been drifting apart into different configurations over

### SCIENCE 10 Unit 4: Earth Science Review

SCIENCE 10 Unit 4: Earth Science Review Use the following diagram to answer questions 1 and 2. 1. Which location has the youngest crust? A. A B. B C. C D. D 2. Which location is associated with subduction?

### Earthquakes Volcanoes Mountains

Earthquakes Volcanoes Mountains Sea Floor Spreading Where is it located? How does it form? How does it change the Earth s surface? Earthquakes Where are earthquakes located? Most earthquakes happen around

### Earthquakes More than 20,000 deaths and

5 Earthquakes More than 20,000 deaths and at least 166,000 injuries resulted from a powerful earthquake in India on January 26, 2001. Collapse of structures, such as this building in Ahmedabad, India,