Finite Fault Forward Modeling of the Mw 7.8 and 7.7 February 2023 Earthquakes Near the Turkey-Syria Border and Aftershock Point Source Modeling Using a Regional 3D Velocity Model for the Middle-East
Description:
Two large and devastating earthquakes struck the Turkey-Syria border region on February 6th 2023 in and on the Eastern Anatolian fault rupturing various faults in the Anatolia, Nubia, Arabia triple junction region. The mainshock, a Mw 7.8 at 01:18 UTC, was followed by a Mw 7.7 event at 10:25 UTC. Based on the USGS finite fault model, the total rupture lengths for each event were over 300 km and ~150 km, respectively, with maximum slip for each exceeding 11 m. The finite fault models for each event suggest significant slip on several faults with complex slip distributions and source time histories as expected for such large earthquakes. Despite their complexity, the models do not predict certain observed ground motions well. We used a regional 3D velocity model (Osvuran et al., 2022) obtained from Full Waveform Inversion and primarily based on data from Turkey to run Specfem3D forward simulations of the finite fault solutions for both events to check whether a well-resolved 3D model produces significant improvements to waveform fits compared with 1D-based simulations. In addition, we used the 3D velocity model to calculate Green’s functions (GFs) for larger aftershocks (Mw≥5.0) and estimated moment tensors (MTs) using the Moment Tensor Uncertainty Quantification (MTUQ) code. We compared the MT solutions with results from 1D GFs to evaluate the 3D model performance in terms of improvements to waveform fitting characteristics and MT parameter resolution.
Session: February 2023 Mw 7.8 Earthquake Sequence in Turkey
Type: Oral
Date: 4/19/2023
Presentation Time: 09:00 AM (local time)
Presenting Author: Felix R. Rodriguez Cardozo
Student Presenter: No
Invited Presentation:
Authors
Felix Rodriguez Cardozo Presenting Author Corresponding Author frodriguezcardozo@gmail.com University of South Florida |
Lucas Sawade lsawade@princeton.edu Princeton University |
Ridvan Orsvuran rorsvuran@mines.edu Colorado School of Mines |
Ebru Bozdag bozdag@mines.edu Colorado School of Mines |
Jochen Braunmiller jbraunmiller@usf.edu University of South Florida |
Glenn Thompson thompsong@usf.edu University of South Florida |
|
|
|
Finite Fault Forward Modeling of the Mw 7.8 and 7.7 February 2023 Earthquakes Near the Turkey-Syria Border and Aftershock Point Source Modeling Using a Regional 3D Velocity Model for the Middle-East
Category
February 2023 Mw 7.8 Earthquake Sequence in Turkey