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The February 6th 2023 earthquake doublet in SE Türkiye: Spatio-temporal preparatory process and fault structure from an enhanced seismicity catalog

Authors
/persons/resource/dbecker

Becker,  Dirk
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;
4.2 Geomechanics and Scientific Drilling, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/kwiatek

Kwiatek,  G.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;
4.2 Geomechanics and Scientific Drilling, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/fcotton

Cotton,  Fabrice
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;
2.6 Seismic Hazard and Risk Dynamics, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/dre

Dresen,  G.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;
4.2 Geomechanics and Scientific Drilling, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/bohnhoff

Bohnhoff,  M.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;
4.2 Geomechanics and Scientific Drilling, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/patricia

Martinez Garzon,  P.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;
4.2 Geomechanics and Scientific Drilling, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Citation

Becker, D., Kwiatek, G., Cotton, F., Dresen, G., Bohnhoff, M., Martinez Garzon, P. (2023): The February 6th 2023 earthquake doublet in SE Türkiye: Spatio-temporal preparatory process and fault structure from an enhanced seismicity catalog, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4524


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020936
Abstract
On February 6th, 2023 at 01:17 UTC, a devastating MW 7.8 earthquake nucleated on the Pazarcik segment of the East Anatolian Fault Zone (EAFZ) bounding the Arabian and Anatolian tectonic plates. The fault rupture included nucleation on a secondary fault branch of the EAFZ towards the SE of the main fault and a subsequent rupture propagation towards the NE and SW on the main EAFZ. This event was followed 9 hours later by an Mw 7.5 event on the Sürgü Fault about 100km to the North.We evaluate the regional earthquake catalog provided by the Turkish Disaster and Emergency Management Presidency in the years leading up to the first mainshock and identify an acceleration in seismicity rates and seismic moment release in the very vicinity of the mainshock epicenter a few months before the earthquake in comparison to surrounding areas. First results show that this activity is concentrated in earthquake clusters on the secondary as well as main fault branch exhibiting low b-values around 0.6-0.7.We develop an enhanced event catalog in the surrounding of the earthquake doublet spanning the time interval 01/01/2023-11/02/2023 using the Phasenet package and perform automatic P- and S-wave phase picking. Picks are associated into events using GaMMA software and single event and relative event locations are performed using NLLoc and hypoDD. The resulting enhanced event catalog presents the detailed view of the spatio-temporal evolution of seismic actvity around the mainshock epicenter framing the last stage of the preparatory process and the first few days of aftershock activity.