Inversion of coseismic deformation due to the 8th February 2016, Mw 4.2 earthquake at Los Humeros (Mexico) inferred from DInSAR

Eszter Bekési, PA Fokker, Joana E. Martins, Jan-Diederik van Wees

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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Abstract

On the 8th of February 2016, a Mw 4.2 earthquake was detected inside the Los Humeros caldera, located in the eastern sector of the Trans-Mexican Volcanic Belt. The event occurred after a sharp increase in the injection rate at the Los Humeros Geothermal Field and it was recorded by the seismic monitoring network of the power plant. The earthquake was felt by the local population and it caused damage in the power plant infrastructure. The focal mechanism solution of a previous study based on seismological data shows a reverse movement with a minor left-lateral component: Mw=4.2, depth=1500m, strike=169°, dip=61°, rake=42°. We have performed a geodetic and geomechanical analysis of the seismic source event based on ground deformation inferred from DInSAR. We used ascending and descending Sentinel-1 differential interferograms to retrieve the horizontal and vertical components of the co-seismic deformation. Subsequently, we inverted the estimated deformation to obtain the solution of an activated fault using the Okada model. These results shed light on the geomechanical aspects of the event and can help to understand the effects of field operations interacting with pre-existing structural features and active tectonic processes in the Los Humeros caldera.
Original languageEnglish
Title of host publicationEuropean Geothermal Congress 2019
Number of pages5
Publication statusPublished - 2019
EventEuropean Geothermal Congress 2019 - World Forum, The Hague, Netherlands
Duration: 11 Jun 201914 Jun 2019
http://europeangeothermalcongress.eu/

Conference

ConferenceEuropean Geothermal Congress 2019
Abbreviated titleEGC
CountryNetherlands
CityThe Hague
Period11/06/1914/06/19
Internet address

Keywords

  • Induced Seismicity
  • DInSAR
  • Los Humeros Geothermal Field

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