Rupture kinematics of 2020 January 24 M-w 6.7 Doganyol-Sivrice, Turkey earthquake on the East Anatolian Fault Zone imaged by space geodesy


Melgar D., Ganas A., Taymaz T., Valkaniotis S., Crowell B. W. , Kapetanidis V., ...More

GEOPHYSICAL JOURNAL INTERNATIONAL, vol.223, no.2, pp.862-874, 2020 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 223 Issue: 2
  • Publication Date: 2020
  • Doi Number: 10.1093/gji/ggaa345
  • Title of Journal : GEOPHYSICAL JOURNAL INTERNATIONAL
  • Page Numbers: pp.862-874

Abstract

Here, we present the results of a kinematic slip model of the 2020 M-w 6.7 Doganyol-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 Ilnd 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 similar to 20 s. In the absence of ncar-source seismic stations, space geodetic data provide the best constraint on the spatial distribution of slip and on its time evolution.