####018003615#### 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=