Dynamics of episodic supershear in the 2023 M7.8 Kahramanmaraş/Pazarcik Earthquake, revealed by near-field records and computational modeling

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1038/s43247-023-01131-7. This is version 4 of this Preprint.

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Authors

Mohamed Abdelmeguid, Chunhui Zhao, Esref Yalcinkaya, George Gazetas, Ahmed Elbanna, Ares J. Rosakis

Abstract

The 2023 M7.8 Kahramanmaraş/Pazarcik earthquake was larger and more destructive than what had been expected. Here we analyzed near-field seismic records and developed a dynamic rupture model that reconciles different currently conflicting inversion results and reveals spatially non-uniform propagation speeds in this earthquake, with predominantly supershear speeds observed along the Narli fault and at the southwest (SW) end of the East Anatolian Fault (EAF). The model highlights the critical role of geometric complexity and heterogeneous frictional conditions in facilitating continued propagation and influencing rupture speed. We also constrained the conditions that allowed for the rupture to jump from the Narli fault to EAF and to generate the delayed backpropagating rupture towards the SW. Our findings have important implications for understanding earthquake hazard and guiding future response efforts and demonstrates the value of physics-based dynamic modeling fused with near-field data in enhancing our understanding of earthquake mechanisms and improving risk assessment.

DOI

https://doi.org/10.31223/X5066R

Subjects

Engineering, Physical Sciences and Mathematics

Keywords

Intermittent Supershear, Kahramanmaras/Pazarcik Earthquake, Supershear Ruptures, Dynamics Rupture Modeling of Kahramanmaraş/Pazarcik Earthquake, Near Fault Strong Motion Records

Dates

Published: 2023-05-03 16:15

Last Updated: 2023-12-05 22:50

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License

CC BY Attribution 4.0 International

Additional Metadata

Conflict of interest statement:
None

Data Availability (Reason not available):
All data included is publicly available and referenced in the manuscript