Database Development for Earthquake Risk Assessment Muhammad Murad Billah Senior GIS Coordinator
CONTENTS Base Map Development Hazard Mapping - Active Fault Study - Engineering Geological Mapping - Seismic Hazard Mapping Vulnerability Mapping - Building - Lifeline (transportation & utility system) - Essential Facilities
GIS DATABASE DEVELOPMENT What is GIS? A geographic information system (GIS) integrates hardware, software, and data for capturing, managing, analyzing, and displaying all forms of geographically referenced information. Database View Model View Map View
BASE MAP Geological Map Source: GSB Grid Microzonation
BASE MAP Quickbird Images Resolution: 62cm Acquisition date: 2006-2008 Georeferencing: RTK GPS & DGPS
Base Map Development Collection of Quick Bird Image Selection of TIC/GCP on the Image and Establishment of Bench Mark Development of GIS database as a base map by incorporating attribute data & field information Geo-referencing the Quickbird Image by RTK GPS with the surveyed GCPs Field verification and Attribute information collection Base line survey with total station On Screen Digitization (building, road, water body, open space, hill)
BASE MAP Topographic Maps Source: SoB (Dhaka & Sylhet), BIWTA&CDA (Chittagong) Scan & georeference Spot-height digitization Digital Elevation Model (DEM) generation
BASE MAP Ward Maps Source: DCC, CDA, SCC Scan, georeference, digitize Field verification & revision Validate to City Corporation Cluster generation
BASE MAP Physical Feature Components: building, road, waterbody, open space, hill Source: RAJUK, CDA, ADPC Base Map Digitize, field survey Field verification & revision
HAZARD MAPPING Active Fault Study Engineering Geological Mapping Seismic Hazard Mapping
ACTIVE FAULT STUDY Active Fault Location Madhupur Fault Dauki Fault Plate Boundary Fault - 1 Plate Boundary Fault - 2 Plate Boundary Fault - 3
ACTIVE FAULT STUDY Observation, Investigation, and Trenching Site Corona Image Study, Historical Earthquake Field Survey: Moynamoti, Dauki, Hobigonj, Tangail, Shitakunda, Madhabkunda, Teknaf &Haluaghat Trenching: Gabrakhari, Haluaghat; and Dharmapur, Feni
ACTIVE FAULT STUDY Trenching activities Gabrakhari, Haluaghat
ACTIVE FAULT STUDY Trenching activities Dharmapur, Feni
ENGINEERING GEOLOGY Field activities & database development Boring Borehole database
ENGINEERING GEOLOGY Field activities & database development PS Logging D7 - Mehernagar, Dhobadia (Kaskura), Dhaka
ENGINEERING GEOLOGY Field activities & database development Array Microtremor Shallow seismic wave measurement
item Usable data (quantities) Dhaka Chittagong Sylhet Area (sqkm) 321 233 160 714 sqkm 420 Grids (250m) 5,150 3,750 2,600 11,500 grids 6720 Geology map by GSB generated Geomorphic Map by GSB generated Boring 38 38 38 114 holes 80 by ADPC(DU)/GSB 1,166 1,145 1,066 3,376 m 4400 less than 30m depth max 100m SPT 777 751 710 2,238 depths 2000 by ADPC(DU)/GSB 1.5m pitch 2m pitch PS logging 7 6 6 19 holes 16 by ADPC(AIT) 190 172 164 526 m 640m less than 30m depth max 50m Shallow Seismic Survey 50 41 34 125 pts 2 Array Microtremor 10 6 6 22 pts 2 Single H/V microtremor city Total reference of Gandhidham 97 86 74 257 pts 50
Usable data (boring location)
Usable data (soil tests) General features of existing soil, such as density but not non-linear characteristics
Usable data (shallow seismic survey)
Usable data (array microtremor) depth Dhaka Chittagong Sylhet Vs>300m/s 15-46m 9-38m < 35m Vs>500m/s 73-178m 19-148m 35-103m
Usable data (single H/V microtremor)
AVS30 for each grid
SEISMIC HAZARD MAP Soil Classification Liquefaction Susceptibility Slope Hazard Susceptibility
Soil Classification
Liquefaction susceptibility
Slope hazard potential
VULNERABILITY MAPPING Building - General Building Stock Lifeline - Transportation System - Utility System Essential Facilities
VULNERABILITY MAPPING Building General Building Stock
VULNERABILITY MAPPING Building Vulnerability Assessment in Dhaka, Chittagong and Sylhet Under CDMP Project following number of buildings have been surveyed In Dhaka about 8500 buildings In Chittagong 6000 buildings and In Sylhet 4500 buildings
Visual and Measurement
Instruments Used for Building Vulnerability Assessment Micro Tremor
Vibration Shaker (Specially developed for this project)
Schmidt Hammer
Ferro-Scan
Ferro-Scan Test
Schmidt Hammer Test
Micro Tremor Test
Vibration Shaker Test
Technology Transfer Depart of Civil Engineering of Shajalal University of Science and Technology (SUST) and Chittagong University of Engineering and Technology (CUET) has acquired the capacity to do similar assessment. 35 Engineers was trained under this project to use different instruments for building vulnerability assessment. 110 Engineering students got on the job training (in surveying building type, occupancy and other aspects).
LIFELINE Highway Transportation System Components: Road, Bridge Assessment: accessibility, structural characteristics
LIFELINE Railway Transportation System Components: Track, Urban Station, Dispatch Facility, Fuel Facility, Maintenance Facility Assessment: accessibility, building structure, service performance
LIFELINE Bus Transportation System Components: Urban Station, Dispatch Facility, Fuel Facility, Maintenance Facility Assessment: building structure, service performance
LIFELINE Inland Water Transportation System Components: Passenger Terminal, Dispatch Facility, Fuel Facility, Maintenance Facility Assessment: building structure, service performance
LIFELINE Potable Water System Components: Pipeline, production & distribution facility Assessment: pipe ductility, facility service performance
LIFELINE Waste Water System Components: Pipeline, collection & distribution facility Assessment: pipe ductility, facility service performance
LIFELINE Natural Gas System Components: Pipeline, distribution facility Assessment: pipe ductility, facility service performance
LIFELINE Electric Power System Components: Distribution facility Assessment: seismic design, facility service performance
LIFELINE Communication System Components: Distribution & transmission station Assessment: structural characteristics, facility service performance
ESSENTIAL FACILITY Components: - Hospital & Clinic - Police & Fire Station - Emergency Operation Center - School & University Assessment: building structure, service performance
Thank You for Your Patience! For further information write to: muradbillah@gamail.com