UPDATE 7:15 p.m.:
THE TSUNAMI ADVISORY IS ENDED FOR THE STATE OF HAWAII EFFECTIVE AT 6:58 PM HST.
AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS
ORIGIN TIME - 1055 AM HST 19 OCT 2020
COORDINATES - 54.7 NORTH 159.6 WEST
LOCATION - SOUTH OF ALASKA
MAGNITUDE - 7.5 MOMENT
MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY
GAUGE LOCATION LAT LON TIME AMPL PER
------------------- ----- ------ ----- --------------- -----
KAHULUI MAUI 20.9N 156.5W 0346Z 0.13M / 0.4FT 20MIN
HILO HI 19.7N 155.1W 0211Z 0.28M / 0.9FT 16MIN
HANALEI HI 22.2N 159.5W 0304Z 0.26M / 0.8FT 18MIN
NAWILIWILI HI 22.0N 159.4W 0142Z 0.09M / 0.3FT 12MIN
KAWAIHAE HAWAII 20.0N 155.8W 0205Z 0.05M / 0.2FT 12MIN
MOKUOLOE OAHU 21.4N 157.8W 0214Z 0.02M / 0.1FT 08MIN
HALEIWA HI 21.6N 158.1W 0147Z 0.19M / 0.6FT 10MIN
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
TSUNAMI WAVE HEIGHTS ACROSS THE STATE OF HAWAII ARE NOW BELOW ADVISORY LEVELS AND ARE CONTINUING TO DIMINISH. MEASUREMENTS RECORDED FOR KAHULUI AND HILO ARE NOW BELOW ADVISORY LEVEL. BASED ON ALL AVAILABLE DATA THE PACIFIC TSUNAMI WARNING CENTER IS NOW CANCELLING THE TSUNAMI ADVISORY. SMALL SEA LEVEL CHANGES AND STRONG OR UNUSUAL CURRENTS MAY PERSIST FOR SEVERAL ADDITIONAL HOURS IN SOME COASTAL AREAS AND APPROPRIATE CAUTION SHOULD BE EXERCISED BY BOATERS AND SWIMMERS.
THIS WILL BE THE FINAL MESSAGE ISSUED FOR THIS EVENT UNLESS
ADDITIONAL DATA ARE RECEIVED.
UPDATE 2:
A TSUNAMI ADVISORY CONTINUES IN EFFECT FOR THE STATE OF HAWAII. AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS ORIGIN TIME - 1055 AM HST 19 OCT 2020 COORDINATES - 54.7 NORTH 159.6 WEST LOCATION - SOUTH OF ALASKA MAGNITUDE - 7.5 MOMENT MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY GAUGE LOCATION LAT LON TIME AMPL PER ------------------- ----- ------ ----- --------------- ----- HANALEI HI 22.2N 159.5W 0304Z 0.26M / 0.8FT 18MIN NAWILIWILI HI 22.0N 159.4W 0142Z 0.09M / 0.3FT 12MIN KAWAIHAE HAWAII 20.0N 155.8W 0205Z 0.05M / 0.2FT 12MIN MOKUOLOE OAHU 21.4N 157.8W 0214Z 0.02M / 0.1FT 08MIN HILO HI 19.7N 155.1W 0211Z 0.30M / 1.0FT 16MIN HALEIWA HI 21.6N 158.1W 0147Z 0.19M / 0.6FT 10MIN KAHULUI MAUI 20.9N 156.5W 0200Z 0.38M / 1.2FT 20MIN 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 TSUNAMI WAVES HAVE BEEN RECORDED AT HILO AND KAHULUI JUST ABOVE ADVISORY LEVEL THAT COULD BE A HAZARD TO SWIMMERS AND BOATERS AS WELL AS TO PERSONS NEAR THE SHORE AT BEACHES AND IN HARBORS AND MARINAS. THIS HAZARD COULD CONTINUE FOR SEVERAL HOURS. THE SITUATION IS BEING MONITORED CLOSELY AND THE ADVISORY WILL END WHEN THE HAZARD HAS PASSED. FURTHER MESSAGES WILL BE ISSUED HOURLY OR SOONER AS CONDITIONS WARRANT UNTIL THE THREAT TO HAWAII HAS PASSED. UPDATE:
This is a Civil Defense Tsunami Advisory message for Monday, October 19th.
The Pacific Tsunami Warning Center has issued a Tsunami Advisory for the Island and State of Hawaii.
A Tsunami Advisory is issued when an earthquake has generated a wave expected to be three feet or less in height when it reaches Hawaii.
An earthquake with a magnitude of 7.5 has occurred at approximately 10:55 HST in the vicinity of the Aleutian Islands in Alaska.
All beaches and low-lying coastal areas are at risk and will be closed for the remainder of today.
I say again, a Tsunami Advisory is in effect for the Island and State of Hawaii.
A Tsunami Advisory is issued when an earthquake has generated a wave expected to be three feet or less in height when it reaches Hawaii.
An earthquake with a magnitude of 7.5 has occurred hear Aleutian Islands Alaska.
All beaches and low-lying coastal areas are at risk and will be closed the rest of the day today.
You will be informed as conditions change.
Your Hawaii County Civil Defense Agency thanks you for your cooperation.
ORIGINAL POST:
A TSUNAMI ADVISORY IS ISSUED FOR THE STATE OF HAWAII EFFECTIVE AT 0438 PM HST.
AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS
ORIGIN TIME - 1055 AM HST 19 OCT 2020
COORDINATES - 54.7 NORTH 159.6 WEST
LOCATION - SOUTH OF ALASKA
MAGNITUDE - 7.5 MOMENT
MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY
GAUGE LOCATION LAT LON TIME AMPL PER
------------------- ----- ------ ----- --------------- -----
KAWAIHAE HAWAII 20.0N 155.8W 0205Z 0.05M / 0.2FT 12MIN
MOKUOLOE OAHU 21.4N 157.8W 0214Z 0.02M / 0.1FT 08MIN
HILO HI 19.7N 155.1W 0211Z 0.30M / 1.0FT 16MIN
HALEIWA HI 21.6N 158.1W 0147Z 0.19M / 0.6FT 10MIN
KAHULUI MAUI 20.9N 156.5W 0200Z 0.38M / 1.2FT 20MIN
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
BASED ON ALL AVAILABLE DATA A MAJOR TSUNAMI IS NOT EXPECTED TO STRIKE THE STATE OF HAWAII. HOWEVER...SEA LEVEL CHANGES HAVE BEEN RECORDED AT HILO AND KAHULUI JUST ABOVE ADVISORY LEVEL THAT COULD BE A HAZARD TO SWIMMERS AND BOATERS AS WELL AS TO PERSONS NEAR THE SHORE AT BEACHES AND IN HARBORS AND MARINAS.THE THREAT MAY CONTINUE FOR SEVERAL HOURS AFTER THE INITIAL WAVE ARRIVAL.
THE ESTIMATED TIME OF ARRIVAL OF THE INITIAL WAVE IS 0327 PM HST MON 19 OCT 2020
FURTHER MESSAGES WILL BE ISSUED HOURLY OR SOONER AS CONDITIONS WARRANT UNTIL THE THREAT TO HAWAII HAS PASSED.