High-resolution seismicity imaging and early aftershock migration of the 2023 Kahramanmaraş (SE Türkiye) MW7.9 7.8 earthquake doubletKey points

We build a high-resolution early aftershock catalog for the 2023 SE Türkiye seismic sequence with PALM, a seamless workflow that sequentially performs phase picking, association, location, and matched filter for continuous data. The catalog contains 29,519 well-located events in the two mainshocks r...

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Bibliographic Details
Published in:Earthquake science 2023-12, Vol.36 (6), p.417-432
Main Authors: Hongyang Ding, Yijian Zhou, Zengxi Ge, Tuncay Taymaz, Abhijit Ghosh, Haoyu Xu, Tahir Serkan Irmak, Xiaodong Song
Format: Article
Language:English
Subjects:
2023 Türkiye Earthquake Doublet
aftershock catalog
aftershock migration
fault imaging
PALM
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Summary:We build a high-resolution early aftershock catalog for the 2023 SE Türkiye seismic sequence with PALM, a seamless workflow that sequentially performs phase picking, association, location, and matched filter for continuous data. The catalog contains 29,519 well-located events in the two mainshocks rupture region during 2023-02-01–2023-02-28, which significantly improves the detection completeness and relocation precision compared to the public routine catalog. Employing the new PALM catalog, we analyze the structure of the seismogenic fault system. We find that the Eastern Anatolian Fault (EAF) that generated the first MW7.9 mainshock is overall near-vertical, whereas complexities are revealed in a small-scale, such as subparallel subfaults, unmapped branches, and stepovers. The seismicity on EAF is shallow (
ISSN:1867-8777