Sözbilir H., Eytemiz C., Bayık Ç., Arca D., Utku M., Özel Füzün S., ...Daha Fazla
SEISMOLOGICAL RESEARCH LETTERS, cilt.1, ss.1, 2026 (SCI-Expanded, Scopus)
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Yayın Türü:
Makale / Tam Makale
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Cilt numarası:
1
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Basım Tarihi:
2026
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Doi Numarası:
10.1785/0220250346
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Dergi Adı:
SEISMOLOGICAL RESEARCH LETTERS
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Derginin Tarandığı İndeksler:
Scopus, Science Citation Index Expanded (SCI-EXPANDED), Compendex, Geobase, DIALNET
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Sayfa Sayıları:
ss.1
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Dokuz Eylül Üniversitesi Adresli:
Evet
Özet
On 10 August 2025 (19:53 local time), a 6.1 earthquake with a shallow focal depth of 10.72 km struck the Sındırgı district within Türkiye’s Western Anatolia extensional province, resulting in one fatality, multiple injuries, and notable structural damage. Although the event ruptured the Sındırgı segment of the Simav fault zone, which is officially mapped as a right‐lateral strike‐slip structure, the mainshock’s focal mechanism unexpectedly revealed northwest–southeast (NW–SE)‐trending dip‐slip normal faulting, whereas subsequent aftershocks persisted for over 78 days and predominantly clustered in the segment’s southern uplifted block. Although this seismic activity was ongoing, a second 6.1 earthquake (7.93 km depth) occurred 13 km southeast of the initial mainshock on 27 October 2025 (22:48 local time), exhibiting an NW–SE oblique‐slip normal mechanism. Furthermore, focal mechanisms for aftershocks () varied significantly between oblique‐to‐strike‐slip and dip‐slip normal faulting, thereby highlighting a profound kinematic ambiguity regarding the earthquake’s source. To resolve this uncertainty, this study integrates field‐based geology, seismology, and Interferometric Synthetic Aperture Radar data, demonstrating that the sequence nucleated at a fault tip before aftershocks migrated east‐southeastward along newly mapped secondary faults of the Emendere fault zone. Consequently, Coulomb stress transfer modeling confirms that the stress accumulated from the 10 August event was transferred east‐southeast, directly triggering the 27 October earthquake and potentially loading adjacent faults for future ruptures. Based on these spatiotemporal and causal characteristics, we classify the Sındırgı sequence as a “double earthquake” driven by a hybrid mechanism; ultimately, the complex interplay of tectonic extension and geothermal implosion distinctly separates this sequence from the typical dip‐slip normal‐faulting events prevalent in Western Anatolia.