Overall Orange Earthquake alert in Türkiye on 23 Apr 2025 09:49 UTC

GDACS is a cooperation framework between the United Nations, the European Commission and disaster managers worldwide to improve awareness, information exchange and coordination in the first phase after major sudden-onset disasters.

M 6.2 in Türkiye on 23 Apr 2025 09:49 UTC

Global Telecommunication Service

GTS (Global Telecommunication Service) is the official Warning and Alerting channel by the World Meteorological Organization (WMO) adopted by several Warning Organizations. As soon as a new GTS message regarding Tropical Cyclones(WT) or Tsunami(WE) the messages are processed and possibly assigned to the specific event. When a new GTS message is present an new tab in the specific event report page is present.The presence of a GTS message is shown in the homepage with a dedicated icon.

Click on the messages list to visualize on the right the detailed text.

Measurements Levels

SOURCE	GAUGE LOCATION	LAT	LON	TIME (UTC)	HEIGHT (m)	PERIOD (min)
INGV	Marmara (Turkiye)	40.97	27.96	10:49	0.04	6

23/04 13:58 WEMM40LIIB231357

23/04 13:54 WEME40LTAA231353

23/04 11:52 WEME40LTAA231150

23/04 11:24 WEMM40LIIB231123

23/04 11:10 WEME40LTAA231109

23/04 10:50 WEME40LTAA231049

23/04 10:31 WEME40LTAA231029

23/04 10:19 WEMM40LIIB231018

23/04 09:56 WEME40LTAA230955

23/04 09:55 WEMM40LIIB230953

2025-04-23 13:58 message from INGV link

Key information extracted from original GTS message :

Evaluation Advisory

Sea level readings indicate a TSUNAMI was generated
Observations and models indicate that no more TSUNAMI waves are expected
When no major waves are observed for two hours after the estimated time of arrival or damaging waves have not occurred for at least two hours then local authorities can assume the threat is passed
Danger to boats and coastal structures can continue for several hours due to the continuing sea level changes and rapid currents
As local conditions can cause a wide variation in TSUNAMI wave action the all clear determination must be made by local authorities
This will be the final message issued for this event unless additional information becomes available

Original Message :

WEMM40 LIIB 231357
TSUNAMI MESSAGE NUMBER 004
NEAM INGV IT-NTWC TSUNAMI SERVICE PROVIDER
ISSUED AT 1357Z 23 APR 2025

... END OF TSUNAMI ADVISORY ...
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

EVALUATION OF TSUNAMI ADVISORY
SEA LEVEL READINGS INDICATE A TSUNAMI WAS GENERATED.
OBSERVATIONS AND MODELS INDICATE THAT NO MORE TSUNAMI WAVES ARE
EXPECTED.
WHEN NO MAJOR WAVES ARE OBSERVED FOR TWO HOURS AFTER THE
ESTIMATED TIME OF ARRIVAL OR DAMAGING WAVES HAVE NOT OCCURRED FOR
AT LEAST TWO HOURS THEN LOCAL AUTHORITIES CAN ASSUME THE THREAT IS
PASSED. DANGER TO BOATS AND COASTAL STRUCTURES CAN CONTINUE FOR
SEVERAL HOURS DUE TO THE CONTINUING SEA LEVEL CHANGES AND RAPID
CURRENTS. AS LOCAL CONDITIONS CAN CAUSE A WIDE VARIATION IN TSUNAMI
WAVE ACTION THE ALL CLEAR DETERMINATION MUST BE MADE BY LOCAL
AUTHORITIES.

THIS WILL BE THE FINAL MESSAGE ISSUED FOR THIS EVENT UNLESS ADDITIONAL
INFORMATION BECOMES AVAILABLE.

=

2025-04-23 13:54 message from KOERI link

Original Message :

WEME40 LTAA 231353
TSUNAMI MESSAGE NUMBER 006
NEAM TSUNAMI SERVICE PROVIDER KOERI (TURKIYE)
ISSUED AT 1353Z 23 APR 2025

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

... END OF 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 - TURKEY
MAGNITUDE - 6.3 [Mwp]

EVALUATION OF TSUNAMI ADVISORY
SEA LEVEL READINGS INDICATE A TSUNAMI WAS GENERATED. OBSERVATIONS AND MODELS INDICATE THAT NO MORE TSUNAMI WAVES ARE EXPECTED. WHEN NO MAJOR WAVES ARE OBSERVED FOR TWO HOURS AFTER THE ESTIMATED TIME OF ARRIVAL OR DAMAGING WAVES HAVE NOT OCCURRED FOR AT LEAST TWO HOURS THEN LOCAL AUTHORITIES CAN ASSUME THE THREAT IS PASSED. DANGER TO BOATS AND COASTAL STRUCTURES CAN CONTINUE FOR SEVERAL HOURS DUE TO THE CONTINUING SEA LEVEL CHANGES AND RAPID CURRENTS. AS LOCAL CONDITIONS CAN CAUSE A WIDE VARIATION IN TSUNAMI WAVE ACTION THE ALL CLEAR DETERMINATION MUST BE MADE BY LOCAL AUTHORITIES.

THIS WILL BE THE FINAL MESSAGE ISSUED FOR THIS EVENT UNLESS ADDITIONAL INFORMATION BECOMES AVAILABLE.

END OF TSUNAMI MESSAGE NUMBER 006=

2025-04-23 11:52 message from KOERI link

Original Message :

WEME40 LTAA 231150
TSUNAMI MESSAGE NUMBER 005
NEAM TSUNAMI SERVICE PROVIDER KOERI (TURKIYE)
ISSUED AT 1150Z 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 ONGOING ...
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 - TURKEY
MAGNITUDE - 6.3 [Mwp]

MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY.

COUNTRY GAUGE LOCATION LAT LON TIME AMPLITUDE(M) PERIOD(MIN)
------------- ---------------- ------- ------- ------------ ------------ -----------
TURKIYE ISTANBUL SILIVRI 41.0724 28.2390 0950Z 23 APR 00.03 02.1
TURKIYE TEKIRDAG M.EREGLI 40.9690 27.9622 0954Z 23 APR 00.02 06.4
TURKIYE YALOVA ESENKOY 40.6183 28.9532 1003Z 23 APR 00.04 04.8
TURKIYE BALIKESIR ERDEK 40.4924 27.9761 1006Z 23 APR 00.06 06.4
TURKIYE TEKIRDAG SARKOY 40.7098 27.3143 1010Z 23 APR 00.05 06.4

LAT - LATITUDE (N-NORTH)
LON - LONGITUDE (E-EAST)
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 GIVEN IN METERS (M).
PER - PERIOD OF TIME IN MINUTES (MIN) FROM ONE WAVE TO THE NEXT.

EVALUATION OF TSUNAMI ADVISORY
SEA LEVEL READINGS INDICATE A TSUNAMI WAS GENERATED. THIS TSUNAMI CAN STRIKE COASTLINES WITH A 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. 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.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 005=

2025-04-23 11:24 message from INGV link

Key information extracted from original GTS message :

Evaluation 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

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 LOCATION	LAT	LON	TIME (UTC)	HEIGHT (m)	PERIOD (min)
Marmara (Turkiye)	40.97	27.96	10:49	0.04	6

Original Message :

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
----------------------------------------------------------
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.

=

2025-04-23 11:10 message from KOERI link

Original Message :

WEME40 LTAA 231109
TSUNAMI MESSAGE NUMBER 004
NEAM TSUNAMI SERVICE PROVIDER KOERI (TURKIYE)
ISSUED AT 1109Z 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 ONGOING ...
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 - TURKEY
MAGNITUDE - 6.3 [Mwp]

MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY.

COUNTRY GAUGE LOCATION LAT LON TIME AMPLITUDE(M) PERIOD(MIN)
------------- ---------------- ------- ------- ------------ ------------ -----------
TURKIYE ISTANBUL SILIVRI 41.0724 28.2390 0950Z 23 APR 00.03 02.1
TURKIYE TEKIRDAG M.EREGLI 40.9690 27.9622 0954Z 23 APR 00.02 06.4
TURKIYE BALIKESIR ERDEK 40.4924 27.9761 1006Z 23 APR 00.06 06.4

LAT - LATITUDE (N-NORTH)
LON - LONGITUDE (E-EAST)
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 GIVEN IN METERS (M).
PER - PERIOD OF TIME IN MINUTES (MIN) FROM ONE WAVE TO THE NEXT.

EVALUATION OF TSUNAMI ADVISORY
SEA LEVEL READINGS INDICATE A TSUNAMI WAS GENERATED. THIS TSUNAMI CAN STRIKE COASTLINES WITH A 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. 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.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 004=

2025-04-23 10:50 message from KOERI link

Original Message :

WEME40 LTAA 231049
TSUNAMI MESSAGE NUMBER 003
NEAM TSUNAMI SERVICE PROVIDER KOERI (TURKIYE)
ISSUED AT 1049Z 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 ONGOING ...
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]

MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY.

COUNTRY GAUGE LOCATION LAT LON TIME AMPLITUDE(M) PERIOD(MIN)
------------- ---------------- ------- ------- ------------ ------------ -----------
TURKIYE ISTANBUL SILIVRI 41.0724 28.2390 0950Z 23 APR 00.03 02.1
TURKIYE TEKIRDAG M.EREGLI 40.9690 27.9622 0954Z 23 APR 00.02 06.4

LAT - LATITUDE (N-NORTH)
LON - LONGITUDE (E-EAST)
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 GIVEN IN METERS (M).
PER - PERIOD OF TIME IN MINUTES (MIN) FROM ONE WAVE TO THE NEXT.

EVALUATION OF TSUNAMI ADVISORY
SEA LEVEL READINGS INDICATE A TSUNAMI WAS GENERATED. THIS TSUNAMI CAN STRIKE COASTLINES WITH A 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. 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.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 003=

2025-04-23 10:31 message from KOERI link

Original Message :

WEME40 LTAA 231029
TSUNAMI MESSAGE NUMBER 002
NEAM TSUNAMI SERVICE PROVIDER KOERI (TURKIYE)
ISSUED AT 1029Z 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 ONGOING ...
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]

MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY.

COUNTRY GAUGE LOCATION LAT LON TIME AMPLITUDE(M) PERIOD(MIN)
------------- ---------------- ------- ------- ------------ ------------ -----------
TURKIYE ISTANBUL SILIVRI 41.0724 28.2390 0950Z 23 APR 00.03 02.1

LAT - LATITUDE (N-NORTH)
LON - LONGITUDE (E-EAST)
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 GIVEN IN METERS (M).
PER - PERIOD OF TIME IN MINUTES (MIN) FROM ONE WAVE TO THE NEXT.

EVALUATION OF TSUNAMI ADVISORY
SEA LEVEL READINGS INDICATE A TSUNAMI WAS GENERATED. THIS TSUNAMI CAN STRIKE COASTLINES WITH A 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. 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.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 002=

2025-04-23 10:19 message from INGV link

Key information extracted from original GTS message :

Evaluation 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

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 LOCATION	LAT	LON	TIME (UTC)	HEIGHT (m)	PERIOD (min)
Marmara (Turkiye)	40.97	27.96	10:03	0.03	6

Original Message :

WEMM40 LIIB 231018
TSUNAMI MESSAGE NUMBER 002
NEAM INGV IT-NTWC TSUNAMI SERVICE PROVIDER
ISSUED AT 1018Z 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
----------------------------------------------------------
TURKIYE - MARMARA 40.97N 27.96E 1003Z 23 APR -0.03M 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.

=

2025-04-23 09:56 message from KOERI link

Key information extracted from original GTS message :

Evaluation 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

Original Message :

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=

2025-04-23 09:55 message from INGV link

Key information extracted from original GTS message :

Evaluation Advisory

It is not known that a TSUNAMI was generated
This watch 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
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

Original Message :

WEMM40 LIIB 230953
TSUNAMI MESSAGE NUMBER 001
NEAM INGV IT-NTWC TSUNAMI SERVICE PROVIDER
ISSUED AT 0953Z 23 APR 2025

... TSUNAMI ADVISORY ...
THIS ALERT APPLIES TO TURKIYE

... TSUNAMI INFORMATION ...
THIS ALERT APPLIES TO ALBANIA ... ALGERIA ... BOSNIA_HERZEGOVINA ...
CROATIA ... CYPRUS ... EGYPT ... FRANCE ... GREECE ... ISRAEL ...
ITALY ... LEBANON ... LIBYA ... MALTA ... MONACO ... MONTENEGRO ...
MOROCCO ... SLOVENIA ... SPAIN ... SYRIA ... TUNISIA ... UK

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
IT IS NOT KNOWN THAT A TSUNAMI WAS GENERATED. THIS WATCH 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.

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

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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