Earthquake Information Update for October 19th, 2020

Tsunami Advisory has been issued for the Island of Hawaii following a magnitude 7.5 earthquake off the South coast of Alaska that occurred Monday morning (October 19th).

Published by: HIRSC - Weather Team

info@hiradioscannercommunity.com


TSUNAMI MESSAGE NUMBER   2
NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
446 PM HST MON OCT 19 2020

TO - EMERGENCY MANAGEMENT IN THE STATE OF HAWAII

SUBJECT - TSUNAMI ADVISORY

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.


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