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Peer-Reviewed Publication
Sci Adv2026;12(36):eaef6076.September 4, 2026Journal Article

Shallow creep and confined ruptures in frictionally unstable mica schist.

Sezim E Güvercin1, Sylvain Barbot1, Lei Zhang2, Mehmet Köküm3, Zekang Yang2, Cengiz Zabcı4,5
1Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089, USA.
2Institute of Geology, China Earthquake Administration, Beijing 100017, China.
3Department of Geological Engineering, Fırat University, 23119 Elazığ, Turkey.
4Istanbul Technical University, T. İş Bankası Marmara Aktif Fay Tehlike ve Risk Uygulama ve Araştırma Merkezi, 34467 İstanbul, Turkey.
5Istanbul Technical University, Department of Geological Engineering, 34467 İstanbul, Turkey.
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Abstract

Crustal faults across geological settings are often enriched in phyllosilicates because of the hydrothermal alteration of wall rocks. The frictional behavior of these altered rocks at mid-crustal conditions remains poorly understood. Here, we show that mica-schist gouge under crustal hydrothermal conditions can host mixed behavior promoting shallow aseismic creep and confined seismic ruptures. We…

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