Rupture kinematics of 2020 January 24 Mw 6.7 Doğanyol-Sivrice, Turkey earthquake on the East Anatolian Fault Zone imaged by space geodesy. Issue 2 (16th July 2020)

• Record Type: Journal Article
• Authors: Melgar, Diego; Ganas, Athanassios; Taymaz, Tuncay; Valkaniotis, Sotiris; Crowell, Brendan W; Kapetanidis, Vasilis; Tsironi, Varvara; Yolsal-Çevikbilen, Seda; Öcalan, Taylan
• Is Part Of: Geophysical journal international. Volume 223:Issue 2(2020)
• Page Start: 862
• Page End: 874
• Publication Date: 2020-07-16
• Subjects: Satellite geodesy -- Earthquake dynamics -- Earthquake source observations; Geophysics -- Periodicals; 550
• DOI: 10.1093/gji/ggaa345
• Languages: English
• ISSNs: 0956-540X

Abstract

SUMMARY: Here, we present the results of a kinematic slip model of the 2020 M w 6.7 Doğanyol-Sivrice, Turkey Earthquake, the most important event in the last 50 yr on the East Anatolian Fault Zone. Our slip model is constrained by two Sentinel-1 interferograms and by 5 three-component high-rate GNSS (Global Navigation Satellite System) recordings close to the earthquake source. We find that most of the slip occurs predominantly in three regions, two of them at between 2 and 10 km depth and a deeper slip region extending down to 20 km depth. We also relocate the first two weeks of aftershocks and find a distribution of events that agrees with these slip features. The HR-GNSS recordings suggest a predominantly unilateral rupture with the effects of a directivity pulse clearly seen in the waveforms and in the measure peak ground velocities. The slip model supports rupture propagation from northeast to southwest at a relatively slow speed of 2.2 km s −1 and a total source duration of ∼20 s. In the absence of near-source seismic stations, space geodetic data provide the best constraint on the spatial distribution of slip and on its time evolution.