Multi-scale rupture growth with alternating directions in a complex fault network during the 2023 south-eastern Türkiye and Syria earthquake doublet

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1029/2023GL103480. This is version 5 of this Preprint.

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Authors

Ryo Okuwaki , Yuji Yagi, Tuncay Taymaz, Stephen Paul Hicks 

Abstract

A devastating doublet of earthquakes with moment magnitude Mw 7.9 and Mw 7.6 earthquakes contiguously occurred in SE Türkiye near the NW border of Syria. Here we perform a potency-density tensor inversion to simultaneously estimate rupture evolution and fault geometry for the doublet. We find the initial Mw 7.9 earthquake involved discrete episodes of supershear rupture and back-rupture propagation, and was triggered by initial rupture along a bifurcated splay of the East Anatolian Fault. The second Mw 7.6 event was triggered by the earlier Mw 7.9 event, and it involved more extensive supershear rupture along a favorably curved fault, and was likely stopped by geometric barriers at the fault ends. Our results highlight the multi-scale cascading rupture growth across the complex fault network that affects the diverse rupture geometries of the 2023 Türkiye earthquake doublet, contributing to the strong ground shaking and associated devastation.

DOI

https://doi.org/10.31223/X5RD4W

Subjects

Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

Keywords

EarthquakeRupture process, inversion, Complex fault geometry, Teleseismic waves, Triggering, earthquake, rupture process, Inversion, Complex fault geometry, Teleseismic waves, triggering

Dates

Published: 2023-03-03 22:56

Last Updated: 2023-06-07 12:18

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License

CC BY Attribution 4.0 International

Additional Metadata

Conflict of interest statement:
None