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

Abstract

Summary Here we present the results of a kinematic slip model of the 2020 Mw 6.7 Doğanyol-Sivrice, Turkey Earthquake, the most important event in the last 50 years on the East Anatolian Fault zone. Our slip model is constrained by two Sentinel-1 interferograms and by 5 three-component high-rate GNSS 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 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.

Kinematics and Dynamics of the 24 January 2020 Mw 6.7 Elazig, Turkey Earthquake

“…By contrast, VR of high-rate GNSS, strong motion is just 40.2% and 33.4%. Particularly, due to a directivity pulse, the peak displacement waveforms at high-rate GNSS stations MALY and ADY1 are severely underestimated, which is also reported in Melgar et al (2020). Further improvements of the strong motion fits would probably require a more precise 3-D local velocity structure.…”

“…We compare our kinematic model (Figure 2c) with those produced by USGS based on teleseismic waveforms (https://earthquake.usgs.gov/earth quakes/eventpage/us60007ewc/finite-fault), Cheloni and Akinci (2020) and Pousse-Beltran et al (2020) based on InSAR observations, and Melgar et al (2020) based on joint InSAR and high-rate GNSS records. Furthermore, we supplement rupture models from each individual data set (see Figure S7) to check their constrains on slip features.…”

Isotropic and Anisotropic P Wave Velocity Structures of the Crust and Uppermost Mantle Beneath Turkey

“…This earthquake ruptured the crust down to a depth of ~21 km. Bilateral type rupture propagation predominantly continued in the SW direction (e.g., Melgar et al, 2020) along a relatively low‐ V zone, particularly at depths of 4 and 12 km, implying that the observed rupture of the mainshock presumably exploited a weak zone within the upper crust.…”

A Stochastic View of the 2020 Elazığ Mw 6.8 Earthquake (Turkey)

“…These offsets have been processed by Melgar et al. (2020) and extracted from high‐rate GNSS displacements.…”

“…(a) Surface displacement in the satellite line‐of‐sight (LOS) direction from a Sentinel‐1 (S1) ascending (asc.) interferogram, overlayed with coseismic GNSS offsets (Melgar et al., 2020). (b) Surface displacement from a Sentinel‐1 descending (dsc.…”