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

Bletery, Quentin and Cavalié, Olivier and Nocquet, Jean-Mathieu and Ragon, Théa (2020) Distribution of Interseismic Coupling Along the North and East Anatolian Faults Inferred From InSAR and GPS Data. Geophysical Research Letters, 47 (16). Art. No. e2020GL087775. ISSN 0094-8276. doi:10.1029/2020GL087775.

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The North Anatolian Fault (NAF) has produced numerous major earthquakes. After decades of quiescence, the M_w 6.8 Elazığ 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 Elazığ earthquake released between 200 and 250 years of accumulated moment, suggesting a bicentennial recurrence time.

Item Type:Article
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URLURL TypeDescription
Bletery, Quentin0000-0002-9796-5487
Nocquet, Jean-Mathieu0000-0002-3436-9354
Ragon, Théa0000-0002-1276-1910
Additional Information:© 2020 American Geophysical Union. Issue Online: 21 August 2020; Version of Record online: 21 August 2020; Accepted manuscript online: 17 August 2020; Manuscript accepted: 05 August 2020; Manuscript revised: 30 July 2020; Manuscript received: 04 March 2020. The SAR data were provided by the European Space Agency through category1 project 6703, accessible at the following address (‐access/). The inversion was performed using the AlTar software developed by Sarah Minson, Junle Jiang, Hailiang Zhang, Romain Jolivet, Zacharie Duputel, Michael Aivazis, James Beck, and Mark Simons at Caltech. We thank the Editor and Romain Jolivet and A. Ozgun Konca for thorough reviews.
Group:Seismological Laboratory
Subject Keywords:Coupling; Interseismic; Anatolia; Earthquake; Bayesian; Inversion
Issue or Number:16
Record Number:CaltechAUTHORS:20200818-131824145
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Official Citation:Bletery, Q., Cavalié, O., Nocquet, J. M., & Ragon, T. (2020). Distribution of interseismic coupling along the North and East Anatolian Faults inferred from InSAR and GPS data. Geophysical Research Letters, 47, e2020GL087775.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105003
Deposited By: Tony Diaz
Deposited On:18 Aug 2020 21:26
Last Modified:16 Nov 2021 18:38

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