Decoding the Rupture Kinematics of the 2023 Mw 7.8 and Mw 7.5 Kahramanmaraş Earthquake Doublet: Insights From Comprehensive Seismic and Geodetic Analysis
Description:
We investigate the rupture kinematics and slip distributions of the recent Mw 7.8 and Mw 7.5 earthquake doublet which struck the East Anatolian Fault (EAF), the Narlı Fault (NF), and the Sürgü Fault near Kahramanmaraş, Turkey, on Feb 6, 2023. Employing a comprehensive dataset that includes distant and local seismic data, high-rate GNSS recordings, InSAR, and SAR images, we apply joint finite fault inversion and slowness enhanced back-projection to unravel the intricacies of the rupture process. Back-projection and finite fault inversion consistently reveals an asymmetric bilateral rupture for the Mw 7.5 event: a supershear west branch and a subshear east branch, each approximately 65 km in length. The supershear branch is further validated through the identification of Mach cones and Mach waves. For the Mw 7.8 mainshock, our detailed examination uncovers a nuanced rupture process: initiation and propagation commence on the NF, with bilateral propagation occurring upon reaching the junction with the EAF. The rupture then extends 120 km to the northeast at 3.05 km/s and 200 km to the southwest at 3.11 km/s. Furthermore, the initiation of slip on the EAF before the arrival of the rupture from the NF suggests a remote triggering relationship between the main fault and the splay fault. To delve into this relationship and the dynamics of rupture triggering from the splay fault to the main fault, we employ dynamic stress calculations. Our study aspires to provide critical insights into the propagation of rupture on complex faults, contributing valuable knowledge applicable to large strike-slip fault systems globally.
Session: Illuminating Complex, Multiplet Earthquake Sequences at Kahramanmaras (Turkiye), Herat (Afghanistan), and Beyond [Poster Session]
Type: Poster
Date: 5/2/2024
Presentation Time: 08:00 AM (local time)
Presenting Author: Liuwei
Student Presenter: Yes
Invited Presentation:
Authors
Liuwei Xu Presenting Author Corresponding Author xuliuw1997@ucla.edu University of California, Los Angeles |
Saeed Mohanna saeedmohanna@g.ucla.edu University of California, Los Angeles |
Lingsen Meng lsmeng@g.ucla.edu University of California, Los Angeles |
Chen Ji ji@geol.ucsb.edu University of California, Santa Barbara |
Jean-Paul Ampuero ampuero@geoazur.unice.fr Université Côte d’Azur |
Zhang Yunjun yunjunzgeo@gmail.com Chinese Academy of Sciences |
Masooma Hasnain mshasnain@g.ucla.edu University of California, Los Angeles |
Risheng Chu chur@apm.ac.cn Chinese Academy of Sciences |
Cunren Liang cunren.liang@pku.edu.cn Peking University |
Decoding the Rupture Kinematics of the 2023 Mw 7.8 and Mw 7.5 Kahramanmaraş Earthquake Doublet: Insights From Comprehensive Seismic and Geodetic Analysis
Category
Illuminating Complex, Multiplet Earthquake Sequences at Kahramanmaras (Turkiye), Herat (Afghanistan), and Beyond