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WEME40 LTAA 230955

TSUNAMI MESSAGE NUMBER 001

NEAM TSUNAMI SERVICE PROVIDER KOERI (TURKIYE)

ISSUED AT 0955Z 23 APR 2025



THIS ALERT IS ADDRESSED TO ALL COUNTRIES AND INSTITUTIONS SUBSCRIBED TO THE SERVICES OF KOERI NEAM TSP IN ITS MONITORING AREA.



... TSUNAMI ADVISORY ...

THIS ALERT APPLIES TO TURKIYE



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 - 40.86 NORTH 28.23 EAST

DEPTH - 10.00 KM

LOCATION - MARMARA SEA

MAGNITUDE - 6.3 [MWP]

VALUE IS SUBJECT TO FURTHER REVISION UPON AVAILABILITY OF ADDITIONAL SEISMIC DATA � MAY DIFFER FROM FINAL MAGNITUDE ESTIMATION.



EVALUATION OF TSUNAMI ADVISORY

IT IS NOT KNOWN THAT A TSUNAMI WAS GENERATED. THIS MESSAGE IS BASED ONLY ON THE EARTHQUAKE EVALUATION. AN EARTHQUAKE OF THIS SIZE HAS THE POTENTIAL TO GENERATE A TSUNAMI THAT CAN STRIKE COASTLINES WITH A WAVE HEIGHT LESS THAN 0.5M AND/OR CAUSE A TSUNAMI RUN-UP LESS THAN 1M. AUTHORITIES SHOULD TAKE APPROPRIATE ACTION IN RESPONSE TO THIS POSSIBILITY. THIS CENTER WILL MONITOR SEA LEVEL DATA FROM GAUGES NEAR THE EARTHQUAKE TO DETERMINE IF A TSUNAMI WAS GENERATED AND ESTIMATE THE SEVERITY OF THE THREAT. A TSUNAMI IS A SERIES OF WAVES AND THE FIRST WAVE MAY NOT BE THE LARGEST. TSUNAMI WAVE HEIGHTS CANNOT BE PREDICTED AND CAN VARY SIGNIFICANTLY ALONG A COAST DUE TO LOCAL EFFECTS. THE TIME FROM ONE TSUNAMI WAVE TO THE NEXT CAN BE FIVE MINUTES TO AN HOUR, AND THE THREAT CAN CONTINUE FOR MANY HOURS AS MULTIPLE WAVES ARRIVE.



ESTIMATED INITIAL TSUNAMI WAVE ARRIVAL TIMES AT FORECAST POINTS WITHIN THE MONITORING 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  LEVEL

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

TURKIYE - TEKIRDAG M.EREGLISI    40.9690  27.9622  0956Z 23 APR  ADVISORY

TURKIYE - ISTANBUL SILIVRI (M)   41.0724  28.2390  1002Z 23 APR  ADVISORY

TURKIYE - ISTANBUL BAKIRKOY      40.9726  28.8798  1005Z 23 APR  ADVISORY

TURKIYE - TEKIRDAG               40.9736  27.5228  1006Z 23 APR  ADVISORY

TURKIYE - YALOVA                 40.6620  29.2776  1006Z 23 APR  ADVISORY

TURKIYE - ISTANBUL TUZLA (M)     40.8123  29.2968  1007Z 23 APR  ADVISORY

TURKIYE - TEKIRDAG ASYAPORT (M)  40.8956  27.4650  1007Z 23 APR  ADVISORY

TURKIYE - ISTANBUL PENDIK        40.8675  29.2395  1012Z 23 APR  ADVISORY

TURKIYE - ISTANBUL HAYDARPASA    40.9926  29.0147  1012Z 23 APR  ADVISORY

TURKIYE - ISTANBUL MALTEPE       40.9298  29.1123  1014Z 23 APR  ADVISORY

TURKIYE - ISTANBUL BCEKMECE (M)  41.0168  28.5828  1014Z 23 APR  ADVISORY

TURKIYE - ISTANBUL YENIKAPI      40.9981  28.9613  1014Z 23 APR  ADVISORY

TURKIYE - BURSA MUDANYA          40.3825  28.8773  1020Z 23 APR  ADVISORY

TURKIYE - TEKIRDAG SARKOY        40.6078  27.1125  1021Z 23 APR  ADVISORY

TURKIYE - ISTANBUL               41.1598  29.0741  1024Z 23 APR  ADVISORY

TURKIYE - BALIKESIR ERDEK        40.3899  27.8452  1112Z 23 APR  ADVISORY





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.



END OF TSUNAMI MESSAGE NUMBER 001=