WEPA40 RJTD 200803

TSUNAMI BULLETIN NUMBER 001

   ISSUED BY NWPTAC(JMA)

   ISSUED AT 0803Z 20 APR 2026

PART 01 OF 01 PARTS



HYPOCENTRAL PARAMETERS

ORIGIN TIME:0752Z 20 APR 2026

PRELIMINARY EPICENTER:LAT39.8NORTH LON143.2EAST

 OFF EAST COAST OF HONSHU, JAPAN

 JAPAN - KURIL ISLANDS - KAMCHATKA PENINSULA

MAG:7.4 (MJMA)



EVALUATION

 THERE IS A POSSIBILITY OF A DESTRUCTIVE LOCAL TSUNAMI

 NEAR THE EPICENTER



ESTIMATION AT FORECAST POINTS - NO TSUNAMI WAVES WITH AN AMPLITUDE

OF 0.3 METERS OR MORE ARE EXPECTED AT ANY FORECAST POINT.



HOWEVER, IN SOME COASTAL AREAS (PARTICULARLY NEAR THE EPICENTER),

HIGHER TSUNAMI WAVES THAN ESTIMATED MAY ARRIVE.

AUTHORITIES SHOULD BE AWARE OF THIS POSSIBILITY.



THIS WILL BE THE FINAL BULLETIN UNLESS CHANGES IN THE POTENTIAL

FOR TSUNAMI GENERATION ARE DEEMED POSSIBLE BASED ON EARTHQUAKE

RE-EVALUATION OR REPORTS INDICATING TSUNAMI OBSERVATION ARE

RECEIVED.



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