Tuesday, January 23, 2018

PTWC: Tsunami Warnings Canceled For Alaskan Quake




















#13,094

As expected, once the magnitude of this  morning's quake  was reduced from 8.2M  to 7.9M, no large destructive tsunami was generated by today's quake (see NWS: 7.9 M Alaskan Earthquake Tsunami Travel Times) and in the past couple of minutes the Pacific Tsusnami Warning Cetner (TPWC) has cancelled all warnings.
 

 TSUNAMI MESSAGE NUMBER 3

NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
1102 UTC TUE JAN 23 2018

...PTWC FINAL TSUNAMI THREAT MESSAGE...


**** NOTICE **** NOTICE **** NOTICE **** NOTICE **** NOTICE *****

 THIS MESSAGE IS ISSUED FOR INFORMATION ONLY IN SUPPORT OF THE
 UNESCO/IOC PACIFIC TSUNAMI WARNING AND MITIGATION SYSTEM AND IS
 MEANT FOR NATIONAL AUTHORITIES IN EACH COUNTRY OF THAT SYSTEM.

 NATIONAL AUTHORITIES WILL DETERMINE THE APPROPRIATE LEVEL OF
 ALERT FOR EACH COUNTRY AND MAY ISSUE ADDITIONAL OR MORE REFINED
 INFORMATION.

**** NOTICE **** NOTICE **** NOTICE **** NOTICE **** NOTICE *****

THE TSUNAMI FORECAST IS UPDATED IN THIS MESSAGE.


PRELIMINARY EARTHQUAKE PARAMETERS
---------------------------------

  * MAGNITUDE      7.9
  * ORIGIN TIME    0932 UTC JAN 23 2018
  * COORDINATES    56.0 NORTH  149.2 WEST
  * DEPTH          19 KM / 12 MILES
  * LOCATION       GULF OF ALASKA


EVALUATION
----------

  * NOTE REVISED EARTHQUAKE MAGNITUDE

  * AN EARTHQUAKE WITH A PRELIMINARY MAGNITUDE OF 7.9 OCCURRED IN  THE GULF OF ALASKA AT 0932 UTC ON TUESDAY JANUARY 23 2018.

TSUNAMI THREAT FORECAST...UPDATED
---------------------------------

  * THERE IS NO TSUNAMI THREAT FOR AREAS COVERED UNDER
    THIS BULLETIN.

RECOMMENDED ACTIONS
-------------------

  * REMAIN OBSERVANT AND EXERCISE NORMAL CAUTION NEAR THE SEA.


TSUNAMI OBSERVATIONS
--------------------

  * THE FOLLOWING ARE TSUNAMI WAVE OBSERVATIONS FROM COASTAL  AND/OR DEEP-OCEAN SEA LEVEL GAUGES AT THE INDICATED
    LOCATIONS. THE MAXIMUM TSUNAMI HEIGHT IS MEASURED WITH
    RESPECT TO THE NORMAL TIDE LEVEL.

                            GAUGE      TIME OF   MAXIMUM     WAVE
                         COORDINATES   MEASURE   TSUNAMI   PERIOD
    GAUGE LOCATION        LAT   LON     (UTC)     HEIGHT    (MIN)
    -------------------------------------------------------------
    DART 46403           52.6N 156.9W    1024   0.03M/ 0.1FT  08
    DART 46410           57.6N 143.8W    1008   0.04M/ 0.1FT  06
    DART 46409           55.3N 148.5W    0944   0.12M/ 0.4FT  04


NEXT UPDATE AND ADDITIONAL INFORMATION
--------------------------------------

  * THIS WILL BE THE FINAL STATEMENT ISSUED FOR THIS EVENT UNLESS   NEW INFORMATION IS RECEIVED OR THE SITUATION CHANGES.

  * AUTHORITATIVE INFORMATION ABOUT THE EARTHQUAKE FROM THE U.S. GEOLOGICAL SURVEY CAN BE FOUND ON THE INTERNET AT
    EARTHQUAKE.USGS.GOV/EARTHQUAKES -ALL LOWER CASE-.

  * FURTHER INFORMATION ABOUT THIS EVENT MAY BE FOUND AT
    PTWC.WEATHER.GOV AND AT WWW.TSUNAMI.GOV.

  * COASTAL REGIONS OF HAWAII... AMERICAN SAMOA... GUAM... AND
    CNMI SHOULD REFER TO PACIFIC TSUNAMI WARNING CENTER MESSAGES  SPECIFICALLY FOR THOSE PLACES THAT CAN BE FOUND AT
    PTWC.WEATHER.GOV.

  * COASTAL REGIONS OF CALIFORNIA... OREGON... WASHINGTON...
    BRITISH COLUMBIA AND ALASKA SHOULD ONLY REFER TO U.S.
    NATIONAL TSUNAMI WARNING CENTER MESSAGES THAT CAN BE FOUND    AT NTWC.ARH.NOAA.GOV.

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