EGU21-1204
https://doi.org/10.5194/egusphere-egu21-1204
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Distribution of Interseismic Coupling Along the North and East Anatolian Faults Inferred From InSAR and GPS Data

Quentin Bletery1, Olivier Cavalié1, Jean-Mathieu Nocquet1,2, and Théa Ragon3
Quentin Bletery et al.
  • 1Université Côte d'Azur, IRD, CNRS, Observatoire de la Côte d'Azur, Géoazur, Valbonne, France
  • 2Institut de Physique du Globe de Paris, Université de Paris, CNRS, Paris, France
  • 3Seismological Laboratory, California Institute of Technology, Pasadena, CA, USA

The North Anatolian Fault (NAF) has produced numerous major earthquakes. After decades of quiescence, the Mw 6.8 Elazı˘g earthquake (24 January 2020) has recently reminded us that the East Anatolian Fault (EAF) is also capable of producing significant earthquakes. To better estimate the seismic hazard associated with these two faults, we jointly invert interferometric synthetic aperture radar (InSAR) and GPS data to image the spatial distribution of interseismic coupling along the eastern part of both the NAF and EAF.We perform the inversion in a Bayesian framework, enabling to estimate uncertainties on both long-term relative plate motion and coupling. We find that coupling is high and deep (0–20 km) on the NAF and heterogeneous and superficial (0–5 km) on the EAF. Our model predicts that the Elazı˘g earthquake released between 200 and 250 years of accumulated moment, suggesting a bicentennial recurrence time.

How to cite: Bletery, Q., Cavalié, O., Nocquet, J.-M., and Ragon, T.: Distribution of Interseismic Coupling Along the North and East Anatolian Faults Inferred From InSAR and GPS Data, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-1204, https://doi.org/10.5194/egusphere-egu21-1204, 2021.

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