Sub- and Super-Shear Ruptures During the February 6, 2023 Mw 7.8 and Mw 7.6 Earthquake Doublet in Se Türkiye From Joint Inversion of Seismic and Geodetic Data
An earthquake doublet (Mw 7.8 and Mw 7.6) with left-lateral strike-slip kinematics occurred on the East Anatolian Fault Zone (EAFZ) on February 6th, 2023. The events produced significant ground motions and caused major impacts to life and infrastructure throughout SE Türkiye and NW Syria. Here we show the results of earthquake relocations of the first 11 days of aftershocks and rupture models for both events inferred from the kinematic inversion of HR-GNSS and strong ground motion data considering a multi-fault, 3D geometry. We find that the first event nucleated on a previously unmapped NE-SW striking Nurdağı-Pazarcık fault before transitioning to the East Anatolian Fault (EAF) and rupturing bilaterally or ~ 350 km and that the second event ruptured the Sürgü-Çardak fault for ~ 160 km. Maximum rupture speeds are estimated to be 3.2 km/s for the Mw 7.8 earthquake. For the Mw 7.6 earthquake, we find super-shear rupture speed of 4.8 km/s for the westward rupture propagation but sub-shear speed for the eastward rupture propagation at 2.8 km/s. Peak slip for both events is estimated to have been as large as ~8 m and ~6 m, respectively. We will also show early results for static and dynamic stress-change modeling and discuss the potential triggering mechanisms between the first and second e in the doublet.
Session: February 2023 Mw 7.8 Earthquake Sequence in Turkey [Poster]
Type: Poster
Room: Ballroom
Date: 4/19/2023
Presentation Time: 08:00 AM (local time)
Presenting Author: Diego Melgar
Student Presenter: No
Additional Authors
Diego Melgar Presenting Author Corresponding Author dmelgarm@uoregon.edu University of Oregon |
Tuncay Taymaz ttaymaz@gmail.com Istanbul Technical University |
Athanassios Ganas aganas@noa.gr National Observatory of Athens |
Brendan Crowell crowellbw@uw.edu University of Washington |
Zoe Mildon zoe.mildon@plymouth.ac.uk University of Plymouth |
Fred Pollitz fpollitz@usgs.gov U.S. Geological Survey |
Seda Yolsal-Çevikbilen sedaycevik@gmail.com Istanbul Technical University |
Tahir Irmak serkannirmak@gmail.com Kocaeli University |
Taylan Öcalan tocalan@yildiz.edu.tr Yildiz Technical university |
Sub- and Super-Shear Ruptures During the February 6, 2023 Mw 7.8 and Mw 7.6 Earthquake Doublet in Se Türkiye From Joint Inversion of Seismic and Geodetic Data
Category
February 2023 Mw 7.8 Earthquake Sequence in Turkey
Description