Saturday, October 27, 2012

[Geology2] TSUNAMI MESSAGE NUMBER - NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI




BULLETIN  TSUNAMI MESSAGE NUMBER   3  NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI  709 PM HST SAT OCT 27 2012    TO - CIVIL DEFENSE IN THE STATE OF HAWAII    SUBJECT - TSUNAMI WARNING    A TSUNAMI WARNING IS ISSUED FOR THE STATE OF HAWAII EFFECTIVE AT  0709 PM HST.  THIS UPGRADE IS DUE TO THE SEA LEVEL READINGS  RECEIVED AND THE RESULTING CHANGE IN THE HAWAII TSUNAMI  FORECAST.    AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS       ORIGIN TIME - 0504 PM HST 27 OCT 2012     COORDINATES - 52.8 NORTH  131.8 WEST     LOCATION    - QUEEN CHARLOTTE ISLANDS REGION     MAGNITUDE   - 7.7  MOMENT    MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY     GAUGE LOCATION        LAT   LON    TIME        AMPL         PER   -------------------  ----- ------  -----  ---------------  -----   DART 46404           45.9N 128.8W  0417Z   0.05M /  0.2FT  20MIN   LANGARA POINT BC     54.2N 133.1W  0424Z   0.20M /  0.7FT  26MIN   DART 46419           48.8N 129.6W  0346Z   0.06M /  0.2FT  12MIN     LAT  - LATITUDE (N-NORTH, S-SOUTH)   LON  - LONGITUDE (E-EAST, W-WEST)   TIME - TIME OF THE MEASUREMENT (Z IS UTC IS GREENWICH TIME)   AMPL - TSUNAMI AMPLITUDE MEASURED RELATIVE TO NORMAL SEA LEVEL.          IT IS ...NOT... CREST-TO-TROUGH WAVE HEIGHT.          VALUES ARE GIVEN IN BOTH METERS(M) AND FEET(FT).   PER  - PERIOD OF TIME IN MINUTES(MIN) FROM ONE WAVE TO THE NEXT.     NOTE - DART MEASUREMENTS ARE FROM THE DEEP OCEAN AND THEY          ARE GENERALLY MUCH SMALLER THAN WOULD BE COASTAL           MEASUREMENTS AT SIMILAR LOCATIONS.    EVALUATION     A TSUNAMI HAS BEEN GENERATED THAT COULD CAUSE DAMAGE ALONG   COASTLINES OF ALL ISLANDS IN THE STATE OF HAWAII. URGENT ACTION   SHOULD BE TAKEN TO PROTECT LIVES AND PROPERTY.     A TSUNAMI IS A SERIES OF LONG OCEAN WAVES. EACH INDIVIDUAL WAVE   CREST CAN LAST 5 TO 15 MINUTES OR MORE AND EXTENSIVELY FLOOD   COASTAL AREAS. THE DANGER CAN CONTINUE FOR MANY HOURS AFTER THE   INITIAL WAVE AS SUBSEQUENT WAVES ARRIVE. TSUNAMI WAVE HEIGHTS   CANNOT BE PREDICTED AND THE FIRST WAVE MAY NOT BE THE LARGEST.   TSUNAMI WAVES EFFICIENTLY WRAP AROUND ISLANDS. ALL SHORES ARE AT   RISK NO MATTER WHICH DIRECTION THEY FACE. THE TROUGH OF A TSUNAMI   WAVE MAY TEMPORARILY EXPOSE THE SEAFLOOR BUT THE AREA WILL   QUICKLY FLOOD AGAIN. EXTREMELY STRONG AND UNUSUAL NEARSHORE   CURRENTS CAN ACCOMPANY A TSUNAMI. DEBRIS PICKED UP AND CARRIED   BY A TSUNAMI AMPLIFIES ITS DESTRUCTIVE POWER. SIMULTANEOUS HIGH   TIDES OR HIGH SURF CAN SIGNIFICANTLY INCREASE THE TSUNAMI HAZARD.     THE ESTIMATED ARRIVAL TIME IN HAWAII OF THE FIRST TSUNAMI WAVE IS                         1028 PM HST SAT 27 OCT 2012    MESSAGES WILL BE ISSUED HOURLY OR SOONER AS CONDITIONS WARRANT.  

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