Navarra registers two earthquakes of magnitude 3.6 and 3.1 with an epicenter north of Pamplona

The National Geographic Institute (IGN) has reported that this Monday at 10:45 p.m. there was an earthquake of magnitude 3.6 five kilometers deep and with an epicenter to the north of Pamplona, ​​in the Egüés Valley area. Minutes later, at 23:02, there would have been a second movement of less intensity (3.1) a little further north, in Lizoain.

An earthquake of magnitude 4.4 wakes up Navarra in the middle of the night

An earthquake of magnitude 4.4 wakes up Navarra in the middle of the night

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The first reactions suggest that it has been felt in the urban centers of the metropolitan area of ​​the capital of Navarra. It so happens that just a year ago, on October 1, 2020, there was an earthquake at the same point, although on that occasion it was even more intense (scale 4.4) and it was noticed in Euskadi or Aragon in addition to in Navarra itself.

As a consequence of this, the IGN prepared a report with the following conclusion: “From August 19, 2020, when the series began, until the update date of this report, a total of 641 earthquakes have been calculated in the area, of which 10 have a magnitude greater than or equal to 3.0 and 55 have been felt by the population “. Add this document: “In the Pyrenean region there have been great earthquakes throughout history, such as the IX-X intensity that occurred in 1428 in Queralbs (Girona), which caused the destruction of the city and some 800 victims, as well as three earthquakes of intensity VIII-IX: 1373 in Ribagorça (Lleida), 1427 in Olot (Girona) and 1660 in the French department of Hautes-Pyrenees. Further west, some minor earthquakes have taken place in the department of the Atlantic Pyrenees ( France), the largest of these being that of intensity VII-VIII in 1814 “. “In the last decades, earthquakes in the west of the Pyrenees are mainly concentrated on the French side, with magnitudes of up to 5.5. Near the epicentral zone, several earthquakes stand out in the surroundings of the city of Pamplona. From the 19th century there are 3 historical earthquakes with intensities between IV and IV-V cataloged and in the 20th century one with intensity VI in 1903 and another with intensity IV in 1990 stand out. Further south there are two earthquakes with intensity V that occurred in Legarda (M 4.5) in 1982 and in Gazólaz (M 4.0) in 1996. To the north it is worth highlighting an earthquake of magnitude 4.2 registered in Olave in 2017 also with intensity V and towards the east there is evidence of an earthquake with intensity IV in Aoiz occurred in 1887 “.

And “in the epicentral zone, the maximum magnitude recorded was 4.5 during the 2004 seismic crisis, a series that some studies associate with the Itoiz Reservoir, and in September 2020, both with intensity V.” “Apart from these two periods in which a large number of events are recorded, it is worth highlighting two events that occurred in the Lizoáin area in 2007 with magnitude 2.8 and intensity IV and in 2010 in Nagore with magnitude 3.5 and intensity III “, explains the IGN.

“The epicentral zone is located to the northeast of the Pamplona basin and is composed of anticlines and synclines with the trend of the axes towards the east, but truncated in some places by fault systems with EW and ESE-OSW directions. This area highlights various quaternary tectonic structures, the main one being the Pamplona fault, with a NNE-SSW orientation of about 120 km in length that crosses the mountain range from the foreland basin of the Ebro to the Paleozoic Basque Massifs and which is interpreted as a deep transverse structure. Other outstanding faults with associated seismicity are the Leiza fault of about 30 km in length, EW orientation and normal type, and the Roncesvalles and Aralar faults. The Pyrenees are the result of the convergence between the Iberian plates and Eurasia that began about 80 million years ago during the Mesozoic-Cenozoic alpine orogeny and whose surface expression has been interpreted by the Norpir fault enaica, a large tectonic structure that crosses the Pyrenees mountain range from east to west. Its current tectonic regime is complex, with numerous active structures and a great diversity of mechanisms. ”

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