ZCZC
WEPA42 PHEB 082348
TIBPAC

TSUNAMI INFORMATION STATEMENT NUMBER 1
NWS PACIFIC TSUNAMI WARNING CENTER HONOLULU HI
2339 UTC SUN OCT 8 2023

...PTWC TSUNAMI INFORMATION STATEMENT...


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

 THIS STATEMENT 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 *****


PRELIMINARY EARTHQUAKE PARAMETERS - FROM JMA
--------------------------------------------

  * MAGNITUDE      5.0
  * ORIGIN TIME    2026 UTC OCT 8 2023
  * COORDINATES    29.7 NORTH  139.9 EAST
  * DEPTH          0 KM / 0 MILES
  * LOCATION       IZU ISLANDS  JAPAN REGION


EVALUATION
----------

  * AN EARTHQUAKE WITH A PRELIMINARY MAGNITUDE OF 5.0 OCCURRED IN
    THE IZU ISLANDS, JAPAN REGION AT 2026 UTC ON SUNDAY OCTOBER
    8 2023.

  * BASED ON ALL AVAILABLE DATA A TSUNAMI WAS GENERATED AT
    APPROXIMATELY THE TIME AND LOCATION OF THIS EARTHQUAKE.

  * TSUNAMI THREAT LIMITED TO IZU ISLANDS AND JAPAN.

  * JMA REPORTED MAXIMUM WAVEHEIGHT OF 60CM AT HACHIJOJIMA.


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

  * NO ACTION IS REQUIRED.


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)
    -------------------------------------------------------------
    TOSASHIMIZU SHIKOKU  32.8N 133.0E    2310   0.28M/ 0.9FT  04
    CHICHIJIMA JP        27.1N 142.2E    2221   0.13M/ 0.4FT  04
    MERA JP              34.9N 139.8E    2239   0.15M/ 0.5FT  06
    KUSHIMOTO JP         33.5N 135.8E    2220   0.12M/ 0.4FT  12


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

  * THIS WILL BE THE ONLY STATEMENT ISSUED FOR THIS EVENT UNLESS
    ADDITIONAL DATA ARE 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.

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

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