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WEMM40 LIIB 231123

TSUNAMI MESSAGE NUMBER 003

NEAM INGV IT-NTWC TSUNAMI SERVICE PROVIDER

ISSUED AT 1123Z 23 APR 2025



... TSUNAMI ADVISORY ONGOING ...

THIS ALERT APPLIES TO TURKIYE



THIS ALERT IS ADDRESSED TO ALL COUNTRIES AND INSTITUTIONS SUBSCRIBED

TO THE SERVICES OF INGV TSP IN ITS MONITORING AREA



THIS MESSAGE IS ISSUED AS ADVICE TO GOVERNMENT AGENCIES. ONLY

NATIONAL AND LOCAL GOVERNMENT AGENCIES HAVE THE AUTHORITY TO MAKE

DECISIONS REGARDING THE OFFICIAL STATE OF ALERT IN THEIR AREA AND ANY

ACTIONS TO BE TAKEN IN RESPONSE.



AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS

ORIGIN TIME - 0949Z 23 APR 2025

COORDINATES - 40.91 NORTH 28.21 EAST

DEPTH - 19 KM

LOCATION - TURKIYE

MAGNITUDE - 6.3



ALERT LEVEL IS ASSIGNED ACCORDING TO THE ABOVE ESTIMATIONS OF

EARTHQUAKE PARAMETERS AND BASED ON ICG/NEAMTWS DECISION MATRIX



EVALUATION OF TSUNAMI ADVISORY

SEA LEVEL READINGS INDICATE A TSUNAMI WAS GENERATED.

THIS TSUNAMI CAN STRIKE COASTLINES WITH WAVE HEIGHT LESS THAN 0.5M AND/OR

CAUSE A TSUNAMI RUN-UP LESS THAN 1M. THIS

CENTER WILL CONTINUE TO MONITOR SEA LEVEL GAUGES NEAREST THE

REGION AND REPORT IF ANY ADDITIONAL TSUNAMI WAVE ACTIVITY IS OBSERVED.

AUTHORITIES SHOULD TAKE APPROPRIATE ACTION IN RESPONSE TO THIS POSSIBILITY.



EVALUATION OF TSUNAMI INFORMATION

BASED ON HISTORICAL EARTHQUAKE AND TSUNAMI MODELLING THERE IS NO

THREAT THAT A TSUNAMI HAS BEEN GENERATED THAT CAN CAUSE DAMAGE OR

MAJOR EFFECT IN THE REGION. THIS MESSAGE IS FOR INFORMATION ONLY.



HOWEVER, AT SOME COASTS, PARTICULARLY THOSE NEAR THE EPICENTER, HIGHER

TSUNAMIS MAY ARRIVE THAN OUR ESTIMATION.

AUTHORITIES SHOULD BE AWARE OF THIS POSSIBILITY.



ESTIMATED INITIAL TSUNAMI WAVE ARRIVAL TIMES AT FORECAST POINTS WITHIN

THE WATCH AREA ARE GIVEN BELOW. ACTUAL ARRIVAL TIMES MAY DIFFER AND

THE INITIAL WAVE MAY NOT BE THE LARGEST. A TSUNAMI IS A SERIES OF WAVES

AND THE TIME BETWEEN SUCCESSIVE WAVES CAN BE FIVE MINUTES TO ONE HOUR.

LOCATION, FORECAST POINT COORDINATES, ARRIVAL TIME, ALERT LEVEL

(ADVISORY, WATCH)

----------------------------------------------------------

TURKIYE - MARMARA 40.97N 27.96E 0954Z 23 APR ADVISORY

TURKIYE - YALOVA 40.66N 29.28E 1006Z 23 APR ADVISORY

TURKIYE - ERDEK 40.39N 27.85E 1031Z 23 APR ADVISORY



MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY

GAUGE LOCATION LAT LON TIME AMPL PER

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TURKIYE - MARMARA 40.97N 27.96E 1049Z 23 APR 0.04M 6MIN

LAT - LATITUDE (N-NORTH, S-SOUTH)

LON - LONGITUDE (E-EAST, W-WEST)

TIME - TIME OF THE MEASUREMENT (Z IS UTC TIME)

AMPL - TSUNAMI AMPLITUDE MEASURED RELATIVE TO NORMAL SEA LEVEL

IT IS ..NOT.. CREST-TO-TROUGH WAVE HEIGHT.

VALUES ARE GIVE N IN METERS (M)

PER - PERIOD OF TIME IN MINUTES (MIN) FROM WAVE TO THE NEXT.



SUPPLEMENT MESSAGES WILL BE ISSUED AS SOON AS NEW DATA AND

EVALUATION ALLOWS. THE TSUNAMI ALERT WILL REMAIN IN EFFECT UNTIL

AN END OF ALERT IS BROADCAST.



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