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Seismology. Main earthquakes recorded

Seismology. Main earthquakes recorded Catalonia. 2021
Date Time of origin Northern latitude (1) Southern latitude (1) Depth of focus (km) Magnitude (Richter Scale) County
January
6 20,44 43,035 3,097 8 2,5 Costa Aude
16 11,40 41,848 2,944 10 3,1 Gironès
February
5 11,07 41,573 2,606 4 2,2 Costa Maresme
15 08,09 42,689 2,300 4 2,2 Pyrénées-Orientales
21 10,31 43,036 0,149 4 1,7 Hautes-Pyrénées
23 20,21 41,850 1,771 3 1,7 Bages
24 02,32 42,137 2,710 4 1,8 Pla de l'Estany
March
8 04,44 42,304 1,536 1 2,4 Alt Urgell
29 11,04 43,050 3,189 20 2,6 Costa Aude
31 10,46 41,843 2,774 8 2,7 Selva
April
1 18,54 42,146 2,708 10 2,0 Pla de l'Estany
3 09,32 42,314 1,610 5 3,1 Alt Urgell
3 10,17 42,312 1,611 4 2,8 Alt Urgell
3 10,57 42,313 1,612 5 2,0 Alt Urgell
3 15,08 43,027 3,080 5 3,4 Costa Aude
3 16,41 43,025 3,103 7 2,2 Costa Aude
4 23,46 43,005 3,085 18 2,3 Costa Aude
5 19,41 42,995 3,073 7 1,7 Costa Aude
5 19,45 42,971 3,086 20 2,4 Costa Aude
7 03,24 43,037 3,099 7 1,7 Costa Aude
25 01,05 42,679 0,130 1 3,0 Huesca
25 13,13 42,997 0,069 5 1,9 Hautes-Pyrénées
May
10 19,12 42,965 2,309 5 1,7 Aude
25 12,31 43,044 0,068 6 2,2 Hautes-Pyrénées
30 03,39 42,366 3,201 0 2,6 Costa Alt Empordà
June
16 04,59 41,812 3,169 6 2,3 Costa Baix Empordà
23 11,56 42,362 3,180 0 2,2 Costa Alt Empordà
27 00,01 43,016 0,329 0 2,0 Pyrénées-Atlantiques
July
12 15,07 43,003 0,172 4 1,8 Hautes-Pyrénées
23 22,04 40,349 0,306 2 2,0 Castelló
31 04,29 42,867 0,275 2 1,7 Hautes-Pyrénées
August
7 13,17 43,001 0,593 4 2,0 Hautes-Pyrénées
7 20,44 43,144 2,422 9 2,4 Aude
September
1 03,45 43,009 0,073 11 1,8 Hautes-Pyrénées
10 04,28 42,922 0,196 0 2,0 Hautes-Pyrénées
10 04,29 42,911 0,188 1 2,7 Hautes-Pyrénées
24 10,04 43,021 0,167 1 2,6 Hautes-Pyrénées
October
8 09,43 42,408 2,314 1 3,5 Ripollès
11 08,23 42,523 1,432 3 3,6 Alt Urgell
December
24 23,04 43,020 0,070 5 1,8 Hautes-Pyrénées
31 00,06 42,291 2,224 6 1,7 Ripollès
Source: Institut Cartogràfic i Geològic de Catalunya.
Note: (1) In degrees.

Last update: February 11, 2022.

Methodological note

Definition of concepts

Magnitude of an earthquake
Instrumental measure of its force. It is related with the energy transported by seismic waves. It is expressed in decimal figures in accordance with the Richter scale, whose highest value is 9.
Profundity of the focus of the earthquake
Distance from the point where the earthquake originated and the epicentre or point of vertical projection over the surface of the Earth. It is expressed in kilometres.
Earthquake
Set of shockwaves generated from a point within the Earth, called its focus or hypocentre, as result of which there is a sudden release of energy produced by a brusque movement between blocks of the crust and the mantle of the Earth. They are defined by the following: magnitude and depth of the focus.

Methodological aspects

The Western Mediterranean is located in a collusion zone between the European and African tectonic plates.

The Seismology Service was created in 1981 to study in detail the seismic activity in the territory, to monitor it closely, and to determine and characterise the seismic zones.

Since 1984, hypocentral determinations have been conducted in consideration of the Service's own data and that of other bodies: the Midi-Pyrénées Observatory, the Institute of Catalan Studies, the National Geographic Institute, the Ebro Observatory, the Fabra Observatory and the Detection and Geophysical Laboratory. Information on seismic activity in Catalonia and its neighbouring regions is released annually in the Seismic Bulletin published by the Geological Institute of Catalonia.

The criterion was to select all the seismic movements those that had an epicentre within the Catalan territory and were of a magnitude equal to or higher than 1.7 on the Richter scale.

Provisional data.

Unavailable information is represented using the symbol ":". When the value is lower than that of the minimum unit to be able to estimate the statistical operation or if it effects statistical confidentiality, the symbol used is "..".