The Tsunami Warning System in the Pacific

Transcription

1 The Tsunami Warning System in the Pacific Pacific Tsunami Warning Center West Coast Alaska Tsunami Warning Center

2 The Tsunami Warning System in the Pacific

3 Tsunami Alert Bulletins Issued by Tsunami Warning Centers 2-15 minutes after an earthquake large enough to cause a tsunami occurs Initial bulletin usually based only on seismic information Subsequent bulletins issued half hourly or more frequently if information warrants until tsunami is confirmed or alert is cancelled Tsunami Warning: The highest level of tsunami alert. Trigger: M 7.5 earthquake in the Pacific Areas from 0-3 hours travel time of the 1st wave arrival. Trigger: M earthquake offshore the California - British Columbia coast Areas from 0-2 hours travel time

4 Tsunami Alert Bulletins cont. Tsunami Watch: The second highest level of tsunami alert. Trigger: M 7.5 earthquake in the Pacific Areas from 3-6 hours travel time of the 1st wave arrival. Trigger: M earthquake offshore the California - British Columbia coast Areas from 2-3 hours travel time Tsunami Advisory: The third highest level of tsunami alert. Trigger: M 7.5 earthquake in the Pacific Areas greater than 6 hours travel time of the 1st wave arrival. Tsunami Warnings, Watches and Advisories do not mean that a tsunami has been detected, only that an earthquake with the potential to produce a tsunami has occurred.

5 TO - TSUNAMI WARNING SYSTEM PARTICIPANTS IN ALASKA/BRITISH COLUMBIA/WASHINGTON/OREGON/CALIFORNIA FROM - WEST COAST AND ALASKA TSUNAMI WARNING CENTER/NOAA/NWS SUBJECT - TSUNAMI WARNING AND WATCH - INITIAL BULLETIN NUMBER 1 ISSUED 01/21/2006 AT 0115 UTC (17:15 PST; 16:15 AST)...THIS MESSAGE IS FOR TEST PURPOSES TO SHOW AN EXAMPLE WEPA41 MESSAGE......A TSUNAMI WARNING IS IN EFFECT WHICH INCLUDES THE ALASKA COASTAL AREAS FROM KODIAK ALASKA TO ATTU ALASKA......A TSUNAMI WATCH IS IN EFFECT FOR THE CALIFORNIA - OREGON - WASHINGTON - BRITISH COLUMBIA AND ALASKA COASTAL AREAS FROM POINT SUR CALIFORNIA TO KODIAK ALASKA......AT THIS TIME THIS BULLETIN IS FOR INFORMATION ONLY FOR OTHER AREAS OF CALIFORNIA...

6 (01:15 1/21; 17:15 PST; 16:15 AST 1/20) EARTHQUAKE DATA PRELIMINARY MAGNITUDE LOCATION N 175.5W 55 MILES W OF ATKA VILLAGE ALASKA 55 MILES NE OF ADAK ALASKA TIME AST 01/20/ PST 01/20/ UTC 01/21/2006 EVALUATION IT IS NOT KNOWN - REPEAT NOT KNOWN - IF A TSUNAMI EXISTS BUT A TSUNAMI MAY HAVE BEEN GENERATED. THEREFORE PERSONS IN LOW LYING COASTAL AREAS SHOULD BE ALERT TO INSTRUCTIONS FROM THEIR LOCAL EMERGENCY OFFICIALS. PERSONS ON THE BEACH SHOULD MOVE TO HIGHER GROUND IF IN A WARNED AREA. TSUNAMIS MAY BE A SERIES OF WAVES WHICH COULD BE DANGEROUS FOR SEVERAL HOURS AFTER THE INITIAL WAVE ARRIVAL.

7 (01:15 1/21; 17:15 PST; 16:15 AST 1/20) COASTAL AREAS BETWEEN AND INCLUDING KODIAK ALASKA TO ATTU ALASKA...A TSUNAMI WARNING IS IN EFFECT WHICH INCLUDES THE ALASKA COASTAL AREAS FROM KODIAK ALASKA TO ATTU ALASKA... ESTIMATED TIMES OF INITIAL WAVE ARRIVAL ADAK-AK 1644 AST JAN 20 SAND PT.-AK 1819 AST JAN 20 SHEMYA-AK 1723 AST JAN 20 COLD BAY-AK 1846 AST JAN 20 DUTCH HRBR 1738 AST JAN 20 KODIAK-AK 1907 AST JAN 20

8 (01:15 1/21; 17:15 PST; 16:15 AST 1/20) COASTAL AREAS FROM POINT SUR CALIFORNIA TO KODIAK ALASKA...A TSUNAMI WATCH IS IN EFFECT FOR THE CALIFORNIA - OREGON - WASHINGTON - BRITISH COLUMBIA AND ALASKA COASTAL AREAS FROM POINT SUR CALIFORNIA TO KODIAK ALASKA... ESTIMATED TIMES OF INITIAL WAVE ARRIVAL SEWARD-AK 1934 AST JAN 20 JUNEAU-AK 2109 AST JAN 20 YAKUTAT-AK 1947 AST JAN 20 TOFINO-BC 2221 PST JAN 20 SITKA-AK 1948 AST JAN 20 NEAH BAY-WA 2232 PST JAN 20 LANGARA-BC 2055 PST JAN 20 CHARLESTON-OR 2236 PST JAN 20 VALDEZ-AK 1957 AST JAN 20 CRESCENT CITY-CA 2243 PST JAN 20 CORDOVA-AK 2006 AST JAN 20 SEASIDE-OR 2244 PST JAN 20 HOMER-AK 2030 AST JAN 20 ASTORIA-OR 2307 PST JAN 20 KETCHIKAN 2107 AST JAN 20 SAN FRANCISCO-CA 2327 PST JAN 20

9 (01:15 1/21; 17:15 PST; 16:15 AST 1/20) COASTAL AREAS FROM THE CALIFORNIA-MEXICO BORDER TO POINT SUR CALIFORNIA...TSUNAMI INFORMATION STATEMENT... NO - REPEAT NO - TSUNAMI WATCH OR WARNING IS IN EFFECT FOR THE COASTAL AREAS FROM THE CALIFORNIA-MEXICO BORDER TO POINT SUR CALIFORNIA FOR INFORMATION ONLY - ESTIMATED TIMES OF INITIAL WAVE ARRIVAL SAN PEDRO-CA 2350 PST JAN 20 LA JOLLA-CA 0001 PST JAN 21

10 (01:15 1/21; 17:15 PST; 16:15 AST 1/20) THE PACIFIC TSUNAMI WARNING CENTER AT EWA BEACH HAWAII WILL ISSUE TSUNAMI BULLETINS FOR HAWAII AND OTHER AREAS OF THE PACIFIC OUTSIDE THE STATES AND PROVINCES LISTED ABOVE. BULLETINS WILL BE ISSUED HALF-HOURLY OR SOONER IF CONDITIONS WARRANT. THE TSUNAMI WARNING AND WATCH WILL REMAIN IN EFFECTUNTIL FURTHER NOTICE. REFER TO THE INTERNET SITE WCATWC.ARH.NOAA.GOV FOR MORE INFORMATION AND EXPECTED ARRIVAL TIMES.

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13 Tsunami Table Top Exercise Earthquake: 11:27 UTC ~11:36 UTC

14 Petrapavlovsk Hachinhoe Sitka Crescent City Hilo

15 First Bulletin: 11:39 UTC.A TSUNAMI WARNING IS IN EFFECT. THIS IS A TSUNAMI WARNING FOR THE COASTAL AREAS FROM DUTCH HARBOR,AK TO ATTU, AK., INCLUSIVE. FOR THE COASTAL AREAS AND FOR RUSSIA AND JAPAN..A TSUNAMI WATCH IS IN EFFECT FOR THE COASTAL AREAS FROM THE NORTH TIP OF VANCOUVER I. BC. TO DUTCH HARBOR, AK, AND FOR MARCUS IS., MIDWAY IS., WAKE IS., HAWAII, MARSHALL ISL, GUAM, JOHNSTONE ISL., TAIWAN, CHUUK. AT THIS TIME, THIS BULLETIN IS FOR INFORMATION ONLY FOR OTHER AREAS OF THE PACIFIC. EARTHQUAKE DATA PRELIMINARY MAGNITUDE 7.6 LOCATION N 163.6E - VICINITY: KAMCHATKA TIME AST 12/05/ PST 12/05/ UTC 12/05/1997 Petrapavlovsk 11:39 PM Warning 22 minutes Sitka 2:39 AM Watch 5 hrs 17 minutes Crescent City 3:39 AM Advisory 7 hrs 14 minutes Hachinhoe 9:39 PM Warning 2 hrs 39 minutes Hilo 1:39 AM Advisory 6 hrs 5 minutes

16 Second Bulletin: 12:40 UTC TSUNAMI BULLETIN NUMBER 2 ISSUED 12/05/1997 AT 1240 UTC.A TSUNAMI WARNING IS IN EFFECT. THIS IS A TSUNAMI WARNING FOR THE COASTAL AREAS FROM DUTCH HARBOR,AK TO ATTU, AK., INCLUSIVE. FOR THE COASTAL AREAS AND FOR RUSSIA AND JAPAN..A TSUNAMI WATCH IS IN EFFECT FOR THE COASTAL AREAS FROM THE NORTH TIP OF VANCOUVER I. BC. TO SAND POINT, AK, AND FOR MARCUS IS., MIDWAY IS., WAKE IS., HAWAII, MARSHALL ISL, GUAM, JOHNSTONE ISL., TAIWAN, CHUUK, YAP, BELAU, PHILIPPINES. AT THIS TIME, THIS BULLETIN IS FOR INFORMATION ONLY FOR OTHER AREAS OF THE PACIFIC. EARTHQUAKE DATA PRELIMINARY MAGNITUDE 7.7 LOCATION N 163.6E - VICINITY: KAMCHATKA TIME AST 12/05/ PST 12/05/ UTC 12/05/1997 Petrapavlovsk 12:40 PM arrived 49 minutes ago Sitka 3:40 AM Watch 4 hrs 18 minutes Crescent City 4:40 AM Advisory 6 hrs 15 minutes Hachinhoe 10:40 PM Warning 1 hr 38 minutes Hilo 2:40 AM Watch 5 hrs 4 minutes

17 Third Bulletin: 13:52 UTC TSUNAMI BULLETIN NUMBER 3 ISSUED 12/05/1997 AT 1352 UTC TSUNAMI WARNING AND WATCH ARE CANCELLED FOR ALL COASTAL AREAS AND ISLANDS IN THE PACIFIC. AN EARTHQUAKE, PRELIMINARY MAGNITUDE 7.7 OCCURRED 05 DEC 1126 UTC. LOCATION N 163.6E - VICINITY: KAMCHATKA EVALUATION: NO DESTRUCTIVE PACIFIC-WIDE TSUNAMI THREAT EXISTS. HOWEVER, SOME AREAS MAY EXPERIENCE SMALL SEA LEVEL CHANGES. THIS WILL BE THE FINAL BULLETIN UNLESS ADDITIONAL INFORMATION BECOMES AVAILABLE. FOR ALL AREAS THE TSUNAMI WARNING AND TSUNAMI WATCH ARE CANCELLED.

18 Confirming a tsunami: Coastal Tide Gauges:

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22 Deep-ocean Assessment and Reporting of Tsunamis DART Program

23 DART Mooring System

24 Station NM Northwest of San Francisco, CA

25 Buoy Amplitude (cm) D D D D130 12

26 A Tsunami Warning is issued - then what? Tsunami bulletins: Sent to State, County, Cities and other governmental organizations. Broadcast over NOAA Weather Radio Disseminated through EAS radio and television system Only local government can make evacuation requests Only local government can issue an all clear

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28 To find out how your community can lower its tsunami risk, attend tomorrow s tutorial on Developing TsunamiReady Communities