the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Seismicity related to the eastern sector of Anatolian escape tectonic: the example of the 24 January 2020 Mw 6.77 Elazığ-Sivrice earthquake
Abstract. The 24 January 2020 Mw 6.77 Elazığ-Sivrice earthquake (Turkey), responsible for 42 casualties and ~ 1600 injured people, is the largest earthquake affecting the East Anatolian Fault (EAF) since 1971. The earthquake partially ruptured a seismic gap. The mainshock was preceded by two foreshocks with Mw ≥ 4.9 and small seismicity clusters occurring in the previous months close to the nucleation point of the main rupture. The significant aftershock sequence comprises twelve earthquakes with Mw ≥ 4.5 within 60 days. We jointly model quasi co-seismic static surface displacements from Interferometric Synthetic Aperture Radar (InSAR) and high-frequency co-seismic data from seismological networks at local, regional and teleseismic distances to retrieve source parameters of the mainshock. We reconstruct the rupture process using a Bayesian bootstrap based probabilistic joint inversion scheme to obtain source parameters and their uncertainties. Full moment tensor for 18 fore-/after-shocks with Mw ≥ 4.3 are obtained based on the modeling of regional broadband data. The posterior mean model for the 2020 Elazığ-Sivrice mainshock shows that the earthquake, with a magnitude Mw 6.77, ruptured at shallow depth (5 ± 2 km) with a left-lateral strike-slip focal mechanism, with a dip angle of 74° ± 2° and a causative fault plane strike of 242° ± 1°, which is compatible with the orientation of the EAF at the centroid location. The rupture nucleated in the vicinity of small foreshock clusters and slowly propagated towards WSW, with a rupture velocity of ~ 2100 ± 130 m s−1 and ~ 27 s rupture duration. The main rupture area, with a length of ~ 26 ± 5 km, only covered 70 % of the former seismic gap, leaving a smaller, unbroken segment of ~ 30 km length to the SE with positive stress change. The subsequent aftershock sequence extended over a broader region of ~ 70 km in length, spreading to both sides of the mainshock rupture patch into the regions experiencing a stress increase according to our Coulomb stress modeling. Our results support the hypothesis of a shallow locking depth of the Anatolian micro-plate, which has a possible implication to the seismic bursts along the EAF and alternating seismic activity on the North Anatolian and the East Anatolian faults.
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RC1: 'Seismicity related to the eastern sector of Anatolian escape tectonic: the example of the 24 January 2020 Mw 6.77 Elazığ-Sivrice earthquake', Anonymous Referee #1, 23 Jun 2020
- AC1: 'Reply to Referee#1', Mohammadreza Jamalreyhani, 09 Sep 2020
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RC2: 'The study of the 24 January 2020 Elazig-Sivrice earthquake in the eastern Turkey.', Anonymous Referee #2, 29 Jun 2020
- AC2: 'Reply to Referee#2', Mohammadreza Jamalreyhani, 09 Sep 2020
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RC3: 'Revision', Anonymous Referee #3, 17 Jul 2020
- AC3: 'Reply to Referee#3', Mohammadreza Jamalreyhani, 09 Sep 2020
-
RC1: 'Seismicity related to the eastern sector of Anatolian escape tectonic: the example of the 24 January 2020 Mw 6.77 Elazığ-Sivrice earthquake', Anonymous Referee #1, 23 Jun 2020
- AC1: 'Reply to Referee#1', Mohammadreza Jamalreyhani, 09 Sep 2020
-
RC2: 'The study of the 24 January 2020 Elazig-Sivrice earthquake in the eastern Turkey.', Anonymous Referee #2, 29 Jun 2020
- AC2: 'Reply to Referee#2', Mohammadreza Jamalreyhani, 09 Sep 2020
-
RC3: 'Revision', Anonymous Referee #3, 17 Jul 2020
- AC3: 'Reply to Referee#3', Mohammadreza Jamalreyhani, 09 Sep 2020
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Cited
14 citations as recorded by crossref.
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- 24 Ocak 2020 Sivrice (Türkiye) Depremi (Mw 6.8): Yer Hareketi Tahmin Denklemlerinin Değerlendirilmesi ve Mikrotremor Çalışmaları E. BAYRAK et al. 10.46464/tdad.1003057
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- Effects of imparted Coulomb stress changes in the seismicity and cluster of the December 2017 Hojedk (SE Iran) triplet B. Maleki Asayesh et al. 10.1007/s00531-020-01901-0
- 4-D tomographic change of Vp and Vp/Vs structure before destructive earthquakes: a case study of the Sivrice-Elazığ earthquake (mw = 6.8), Eastern Turkey C. Ozer 10.1007/s11069-021-04761-2
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- Reservoir-Triggered Earthquakes Around the Atatürk Dam (Southeastern Turkey) P. Büyükakpınar et al. 10.3389/feart.2021.663385
- Investigation of Source Parameters of the 2020 Elazig-Sivrice Earthquake (Mw 6.8) in the East Anatolian Fault Zone C. Bayik et al. 10.1007/s00024-022-02944-x
- Dynamic sub-surface characteristic and the active faults of the Genç District locating over the Bingöl Seismic Gap of the East Anatolian Fault Zone, Eastern Turkey K. Akbayram et al. 10.1007/s11069-022-05414-8
- P-Alıcı Fonksiyonları ve Rayleigh Dalgası Grup Hızları’nın Birleşik Ters Çözümü’nden Doğu Anadolu Fay Zonu’nun Kabuk ve Üst Manto Hız Yapısı H. ALKAN 10.31590/ejosat.818592
- Surface deformations of 24 January 2020 Sivrice (Elazığ)–Doğanyol (Malatya) earthquake (Mw = 6.8) along the Pütürge segment of the East Anatolian Fault Zone and its comparison with Turkey’s 100-year-surface ruptures O. Tatar et al. 10.1007/s42990-020-00037-2