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Teil Earthquake, November 11, 2019 - Regional earthquake estimate based on instrumental and macro-seismic data (Shakemap)

2019-11

Description : On November 11, 2019 at 11:53 a.m., the Résif seismological stations recorded an earthquake of a magnitude greater than 5 near Montélimar. An analyst from Eost in Strasbourg locates the earthquake manually less than an hour later. He confirms a magnitude of 5.2 Mlv. The characteristics of the earthquake immediately appear remarkable: high magnitude and very low depth (2 to 3 km). This information is confirmed at the same time by the relocation work carried out in ISTerre (Grenoble) and Geoazur (Nice), where the mechanism at the focus is validated from the reactive seismological data, confirming the probable NE-SW direction of the fault. On the same day, the national post-seismic cell was activated and, from then on, many instruments and scientific teams were mobilized to monitor the evolution of the crisis and determine its characteristics with the greatest possible accuracy (magnitude, location, depth, type of associated fault movement, ground movements, etc.). Another surprising feature of this earthquake was quickly observed: it was followed by very few aftershocks. Apart from an aftershock of magnitude 1.5 three minutes after the main shock, the first aftershock (2.2 MLv) felt occurred on November 13. A few days after the first tremor, the CNRS initiated a specific scientific mission in which specialists from the CNRS, universities and other organisations would cooperate to study the event and its causes. Résif is a national research infrastructure dedicated to the observation and understanding of the internal Earth structure and dynamics. Résif is based on high-tech observation networks composed of seismological, geodetic and gravimetric instruments that are densely deployed throughout France. The data collected enable the study of ground deformation, surface and deep structures, local and global seismicity and natural hazards, particularly seismic, on French territory with a high spatio-temporal resolution. Résif is integrated into the European (EPOS - European Plate Observing System) and worldwide systems of instruments used to image the interior of the Earth as a whole and to study numerous natural phenomena.


https://medihal.archives-ouvertes.fr/hal-02504916
Contributor : Véronique Bertrand <>
Submitted on : Wednesday, March 11, 2020 - 10:21:49 AM
Last modification on : Tuesday, January 5, 2021 - 10:19:46 AM
Long-term archiving on: : Friday, June 12, 2020 - 1:52:02 PM