Overall Green Earthquake alert in Greece on 18 Sep 2020 16:28 UTC

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M 5.9 in Greece on 18 Sep 2020 16:28 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.

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Measurements Levels

SOURCE	GAUGE LOCATION	LAT	LON	TIME (UTC)	HEIGHT (m)	PERIOD (min)

18/09 18:34 WEME40LGAT181833

18/09 16:41 WEME40LGAT181640

18/09 16:38 WEME40LTAA181635

18/09 16:36 WEMM40LIIB181635

2020-09-18 18:34 message from NOA link

Key information extracted from original GTS message :

Evaluation Advisory

Sea level readings indicate that no TSUNAMI was generated
The TSUNAMI alert is cancelled
However earthquakes of this size can generate small tsunamis that cause locally changes in currents and resonance in harbours
Authorities should be aware of this possibility and take appropriate action
This will be the final message issued for this event unless additional information becomes available

Original Message :

WEME40 LGAT 181833
TSUNAMI MESSAGE NUMBER 002
NEAM NOA HL-NTWC TSUNAMI SERVICE PROVIDER
ISSUED AT 1831Z 18 SEP 2020

... TSUNAMI ADVISORY CANCELLATION ...
THIS ALERT APPLIES TO GREECE

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 - 1628 UTC FRI SEP 18 2020
COORDINATES - 34.89 NORTH 25.29 EAST
DEPTH - 25.5 KM
LOCATION - 19 KM SW FROM ARVI
MAGNITUDE - 5.8 ML

EVALUATION OF TSUNAMI ADVISORY
SEA LEVEL READINGS INDICATE THAT NO TSUNAMI WAS GENERATED.
THE TSUNAMI ALERT IS CANCELLED.
HOWEVER, EARTHQUAKES OF THIS SIZE CAN GENERATE SMALL TSUNAMIS THAT CAUSE LOCALLY
CHANGES IN CURRENTS AND RESONANCE IN HARBOURS. AUTHORITIES SHOULD BE AWARE OF
THIS POSSIBILITY AND TAKE APPROPRIATE ACTION.

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

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2020-09-18 16:41 message from NOA 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

Original Message :

WEME40 LGAT 181640
TSUNAMI MESSAGE NUMBER 001
NEAM NOA HL-NTWC TSUNAMI SERVICE PROVIDER
ISSUED AT 1639Z 18 SEP 2020

... TSUNAMI ADVISORY ...
THIS ALERT APPLIES TO GREECE

... TSUNAMI INFORMATION ...
THIS ALERT APPLIES TO BELGIUM ... EGYPT ... FRANCE ... GERMANY ... GREECE ...
CYPRUS ... ISRAEL ... ITALY ... LEBANON ... PORTUGAL ... SPAIN ... SWEDEN ...
TURKEY ... UNITED KINGDOM ... IOC (UNESCO) .... ERCC (EUROPEAN COMMISSION)

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 - 1628 UTC FRI SEP 18 2020
COORDINATES - 34.89 NORTH 25.29 EAST
DEPTH - 25.5 KM
LOCATION - 19 KM SW FROM ARVI
MAGNITUDE - 5.8 ML

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.

ESTIMATED INITIAL TSUNAMI WAVE ARRIVAL TIMES AT FORECAST POINTS WITHIN THE ADVISORY
AREA 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 FP COORDINATES ARRIVAL TIME ALERT LEVEL
-------------------- -------------- ------------- -----------

GREECE-IERAPETRA 35.01N 25.74E 1636Z 18 SEP ADVISORY
GREECE-SITEIA 35.23N 26.11E 1711Z 18 SEP ADVISORY
GREECE-AGIOS_NIKOLAOS 35.21N 25.72E 1714Z 18 SEP ADVISORY
GREECE-RETHIMNON 35.38N 24.47E 1724Z 18 SEP 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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2020-09-18 16:38 message from KOERI link

Key information extracted from original GTS message :

Evaluation Information

Based on historical earthquake and TSUNAMI modelling no TSUNAMI generation is expected that can cause damage or major effect in the region
However the possibility of a TSUNAMI generation such as due to submarine landslides can not be excluded
Koeri will continue to monitor sea level readings and MAY issue further messages if required
This will be the final message issued for this event unless additional information becomes available

Original Message :

WEME40 LTAA 181635
TSUNAMI MESSAGE NUMBER 001
NEAM TSUNAMI SERVICE PROVIDER KOERI (TURKEY)
ISSUED AT 1635Z 18 SEP 2020

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

... TSUNAMI INFORMATION ...
THIS ALERT APPLIES TO ALBANIA ... CROATIA ... CYPRUS ... EGYPT ... GREECE ... ISRAEL ... ITALY ... LEBANON ... LIBYA ... MALTA ... MONTENEGRO ... PALESTINE ... SYRIA ... TRNC ... TUNISIA ... TURKEY

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 - 1628Z 18 SEP 2020
COORDINATES - 34.71 NORTH 25.18 EAST
DEPTH - 35.00 KM
LOCATION - CRETE, GREECE
MAGNITUDE - 5.8 [MWP]
VALUE IS SUBJECT TO FURTHER REVISION UPON AVAILABILITY OF ADDITIONAL SEISMIC DATA - MAY DIFFER FROM FINAL MAGNITUDE ESTIMATION.

EVALUATION OF TSUNAMI INFORMATION
BASED ON HISTORICAL EARTHQUAKE AND TSUNAMI MODELLING NO TSUNAMI GENERATION IS EXPECTED THAT CAN CAUSE DAMAGE OR MAJOR EFFECT IN THE REGION. HOWEVER, THE POSSIBILITY OF A TSUNAMI GENERATION, SUCH AS DUE TO SUBMARINE LANDSLIDES, CAN NOT BE EXCLUDED. KOERI WILL CONTINUE TO MONITOR SEA LEVEL READINGS AND MAY ISSUE FURTHER MESSAGES IF REQUIRED.

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

END OF TSUNAMI MESSAGE NUMBER 001=

>

2020-09-18 16:36 message from INGV link

Key information extracted from original GTS message :

Evaluation 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
This will be the final message issued for this event unless additional information becomes available

Original Message :

WEMM40 LIIB 181635
TSUNAMI MESSAGE NUMBER 001
NEAM INGV IT-NTWC TSUNAMI SERVICE PROVIDER
ISSUED AT 1635Z 18 SEP 2020

... 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 ... TURKEY ...
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 - 1628Z 18 SEP 2020
COORDINATES - 34.70 NORTH 25.22 EAST
DEPTH - 20 KM
LOCATION - CRETE_GREECE
MAGNITUDE - 5.8

ALERT LEVEL IS ASSIGNED ACCORDING TO THE ABOVE ESTIMATIONS OF
EARTHQUAKE PARAMETERS AND BASED ON ICG/NEAMTWS DECISION MATRIX

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.

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

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