Overall Orange Earthquake in Algeria on 18 Mar 2021 00:04 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 in Algeria on 18 Mar 2021 00:04 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)
CENALT	MATEL	38.93	8.72	01:22	0.1	6
INGV	Marina_di_teulada (Italy)	38.93	8.72	01:23	0.09	12

18/03 03:27 WEMQ40LFPW180317

18/03 02:35 WEMM40LIIB180234

18/03 01:52 WEMQ40LFPW180149

18/03 01:49 WEMM40LIIB180148

18/03 00:54 WEMQ40LFPW180045

18/03 00:15 WEMM40LIIB180014

18/03 00:15 WEMQ40LFPW180013

2021-03-18 03:27 message from CENALT 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
Evaluation of TSUNAMI information 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

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)
MATEL	38.93	8.72	01:22	0.1	6

Original Message :

WEMQ40 LFPW 180317

WEMQ40 LFPW 180317
TSUNAMI MESSAGE NUMBER 004
NEAM CENALT TSUNAMI SERVICE PROVIDER
ISSUED AT 0317Z 18 MAR 2021

... END OF TSUNAMI ADVISORY ...
THIS ALERT APPLIES TO ALGERIA ... ITALY ... SPAIN ... TUNISIA

... END OF TSUNAMI INFORMATION ...
THIS ALERT APPLIES TO ALBANIA ... BELGIUM ... BULGARIA ... CAPE VERDE
... CROATIA ... CYPRUS ... DENMARK ... EGYPT ... ESTONIA ... FINLAND ...
GEORGIA ... GERMANY ... GREECE ... ICELAND ... IRELAND ... ISRAEL ...
LEBANON ... LIBYA ... MALTA ... MAURITANIA ... MONTENEGRO ...
NETHERLANDS ... NORWAY ... POLAND ... PORTUGAL ... ROMANIA ... RUSSIAN
FEDERATION ... SLOVENIA ... SWEDEN ... SYRIA ... TURKEY ... UKRAINE ...
FRANCE ... MONACO ... MOROCCO ... UNITED KINGDOM

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 - 0004Z 18 MAR 2021
COORDINATES - 36.88 NORTH 5.21 EAST
DEPTH - 14 KM
LOCATION - NORTHERN ALGERIA
MAGNITUDE - 6.0

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.

EVALUATION OF TSUNAMI INFORMATION

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.

MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY
GAUGE LOCATION LAT LON TIME AMPL PER
------------------- ----- ------ ----- --------------- -----
MATEL 38.93N 8.72E 0122Z 0.10M 6MN

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

>

2021-03-18 02:35 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 180234
TSUNAMI MESSAGE NUMBER 003
NEAM INGV IT-NTWC TSUNAMI SERVICE PROVIDER
ISSUED AT 0234Z 18 MAR 2021

... END OF TSUNAMI ADVISORY ...
THIS ALERT APPLIES TO ALGERIA

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 - 0004Z 18 MAR 2021
COORDINATES - 36.92 NORTH 5.19 EAST
DEPTH - 12 KM
LOCATION - NORTHERN_ALGERIA
MAGNITUDE - 6.2

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.

=

>

2021-03-18 01:52 message from CENALT link

Key information extracted from original GTS message :

Evaluation 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

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)
MATEL	38.93	8.72	01:22	0.1	6

Original Message :

WEMQ40 LFPW 180149

WEMQ40 LFPW 180149
TSUNAMI MESSAGE NUMBER 003
NEAM CENALT TSUNAMI SERVICE PROVIDER
ISSUED AT 0149Z 18 MAR 2021

... TSUNAMI ADVISORY ONGOING ...
THIS ALERT APPLIES TO ALGERIA ... ITALY ... SPAIN ... TUNISIA

... TSUNAMI INFORMATION ONGOING ...
THIS ALERT APPLIES TO ALBANIA ... BELGIUM ... BULGARIA ... CAPE VERDE ... CROATIA ... CYPRUS ... DENMARK ... EGYPT ... ESTONIA ... FINLAND ... GEORGIA ... GERMANY ... GREECE ... ICELAND ... IRELAND ... ISRAEL ... LEBANON ... LIBYA ... MALTA ... MAURITANIA ... MONTENEGRO ... NETHERLANDS ... NORWAY ... POLAND ... PORTUGAL ... ROMANIA ... RUSSIAN FEDERATION ... SLOVENIA ... SWEDEN ... SYRIA ... TURKEY ... UKRAINE ... FRANCE ... MONACO ... MOROCCO ... UNITED KINGDOM

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 - 0004Z 18 MAR 2021
COORDINATES - 36.88 NORTH 5.21 EAST
DEPTH - 14 KM
LOCATION - NORTHERN ALGERIA
MAGNITUDE - 6.0

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.

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 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 LEVEL (ADVISORY, WATCH)
-------------------------------- ------------ ------------
ALGERIA - JIJEL 36.82N 5.79E 0017Z 18 MAR ADVISORY
ALGERIA - ALGER 36.77N 3.08E 0032Z 18 MAR ADVISORY
SPAIN - MAHON 39.89N 4.26E 0051Z 18 MAR ADVISORY
SPAIN - PALMADEMALLORCA 39.57N 2.65E 0111Z 18 MAR ADVISORY
TUNISIA - TABARKA 36.96N 8.75E 0056Z 18 MAR ADVISORY
ITALY - CARLOFORTE 39.15N 8.31E 0114Z 18 MAR ADVISORY

MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY
GAUGE LOCATION LAT LON TIME AMPL PER
------------------- ----- ------ ----- --------------- -----
MATEL 38.93N 8.72E 0122Z 0.10M 6MN

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.

>

2021-03-18 01:49 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)
Marina_di_teulada (Italy)	38.93	8.72	01:23	0.09	12

Original Message :

WEMM40 LIIB 180148
TSUNAMI MESSAGE NUMBER 002
NEAM INGV IT-NTWC TSUNAMI SERVICE PROVIDER
ISSUED AT 0148Z 18 MAR 2021

... TSUNAMI ADVISORY ONGOING ...
THIS ALERT APPLIES TO ALGERIA

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 - 0004Z 18 MAR 2021
COORDINATES - 36.92 NORTH 5.19 EAST
DEPTH - 12 KM
LOCATION - NORTHERN_ALGERIA
MAGNITUDE - 6.2

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)
----------------------------------------------------------
ALGERIA - BEJAIA 36.74N 5.11E 0010Z 18 MAR ADVISORY

MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY
GAUGE LOCATION LAT LON TIME AMPL PER
----------------------------------------------------------
SPAIN - MAHON 39.89N 4.27E 0129Z 18 MAR 0.06M MIN
ITALY - MARINA_DI_TEULADA 38.93N 8.72E 0123Z 18 MAR -0.09M 12MIN
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.

=

>

2021-03-18 00:54 message from CENALT link

Key information extracted from original GTS message :

Evaluation Advisory

It is not known that a TSUNAMI was generated
This warning 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 :

WEMQ40 LFPW 180045

WEMQ40 LFPW 180045
TSUNAMI MESSAGE NUMBER 002
NEAM CENALT TSUNAMI SERVICE PROVIDER
ISSUED AT 0045Z 18 MAR 2021

... TSUNAMI ADVISORY ONGOING ...
THIS ALERT APPLIES TO ALGERIA ... ITALY ... SPAIN ... TUNISIA

... TSUNAMI INFORMATION ONGOING ...
THIS ALERT APPLIES TO ALBANIA ... BELGIUM ... BULGARIA ... CAPE VERDE ... CROATIA ... CYPRUS ... DENMARK ... EGYPT ... ESTONIA ... FINLAND ... GEORGIA ... GERMANY ... GREECE ... ICELAND ... IRELAND ... ISRAEL ... LEBANON ... LIBYA ... MALTA ... MAURITANIA ... MONTENEGRO ... NETHERLANDS ... NORWAY ... POLAND ... PORTUGAL ... ROMANIA ... RUSSIAN FEDERATION ... SLOVENIA ... SWEDEN ... SYRIA ... TURKEY ... UKRAINE ... FRANCE ... MONACO ... MOROCCO ... UNITED KINGDOM

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 - 0004Z 18 MAR 2021
COORDINATES - 36.88 NORTH 5.21 EAST
DEPTH - 14 KM
LOCATION - NORTHERN ALGERIA
MAGNITUDE - 6.0

EVALUATION OF TSUNAMI ADVISORY
IT IS NOT KNOWN THAT A TSUNAMI WAS GENERATED.
THIS WARNING 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 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 LEVEL (ADVISORY, WATCH)
-------------------------------- ------------ ------------
ALGERIA - JIJEL 36.82N 5.79E 0017Z 18 MAR ADVISORY
ALGERIA - ALGER 36.77N 3.08E 0032Z 18 MAR ADVISORY
SPAIN - MAHON 39.89N 4.26E 0051Z 18 MAR ADVISORY
SPAIN - PALMADEMALLORCA 39.57N 2.65E 0111Z 18 MAR ADVISORY
TUNISIA - TABARKA 36.96N 8.75E 0056Z 18 MAR ADVISORY
ITALY - CARLOFORTE 39.15N 8.31E 0114Z 18 MAR 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.

>

2021-03-18 00:15 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 180014
TSUNAMI MESSAGE NUMBER 001
NEAM INGV IT-NTWC TSUNAMI SERVICE PROVIDER
ISSUED AT 0014Z 18 MAR 2021

... TSUNAMI ADVISORY ...
THIS ALERT APPLIES TO ALGERIA

... 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 - 0004Z 18 MAR 2021
COORDINATES - 36.92 NORTH 5.19 EAST
DEPTH - 12 KM
LOCATION - NORTHERN_ALGERIA
MAGNITUDE - 6.2

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)
----------------------------------------------------------
ALGERIA - BEJAIA 36.74N 5.11E 0010Z 18 MAR 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.

=

>

2021-03-18 00:15 message from CENALT 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

Original Message :

WEMQ40 LFPW 180013

WEMQ42 LFPW 180013
TSUNAMI MESSAGE NUMBER 001
NEAM CENALT TSUNAMI SERVICE PROVIDER
ISSUED AT 0013Z 18 MAR 2021

... TSUNAMI INFORMATION ...
THIS ALERT APPLIES TO ALBANIA ... BELGIUM ... BULGARIA ... CAPE VERDE ... CROATIA ... CYPRUS ... DENMARK ... EGYPT ... ESTONIA ... FINLAND ... GEORGIA ... GERMANY ... GREECE ... ICELAND ... IRELAND ... ISRAEL ... LEBANON ... LIBYA ... MALTA ... MAURITANIA ... MONTENEGRO ... NETHERLANDS ... NORWAY ... POLAND ... PORTUGAL ... ROMANIA ... RUSSIAN FEDERATION ... SLOVENIA ... SWEDEN ... SYRIA ... TURKEY ... UKRAINE ... ALGERIA ... FRANCE ... ITALY ... MONACO ... MOROCCO ... SPAIN ... TUNISIA ... UNITED KINGDOM

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 - 0004Z 18 MAR 2021
COORDINATES - 36.98 NORTH 5.20 EAST
DEPTH - 10 KM
LOCATION - NORTHERN ALGERIA
MAGNITUDE - 5.8

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.

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.

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

>

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