Gouge fabrics reset by thermal pressurization record stress on faults after earthquakes

Li Wei Kuo*, Hiroki Sone, Vladimir Luzin, En Chao Yeh, Ya Ju Hsu, Eh Tan

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

1 引文 斯高帕斯(Scopus)

摘要

Stress on seismogenic faults provides critical information about how much elastic energy is stored in the crust and released by earthquakes, which is crucial in understanding earthquake energetics and recurrence. However, determining post-earthquake stress states on faults remains challenging because current borehole methods are rarely applicable to damaged fault zone rocks. We applied neutron texture analysis to gouge samples of the 1999 Chi-Chi earthquake in Taiwan to infer the stress state after the earthquake. Results indicate that the clay fabric within the principal slip zone is orthogonal to the fault plane, whereas outside the principal slip zone the fabric is predominantly parallel to the bedding-parallel fault plane. We suggest that the clay fabric in the slip zone was first neutralized by the coseismic fluidization caused by thermal pressurization and later re-oriented to the new direction of post-earthquake principal stress. Such stress orientation is consistent with the orientations inferred from corescale fault slip data and dislocation models constrained from global navigation satellite system displacements. If thermal pressurization is a ubiquitous process during earthquakes, gouge fabrics can be used to help probe the post-earthquake stress state of faults.

原文英語
頁(從 - 到)1033-1037
頁數5
期刊Geology
50
發行號9
DOIs
出版狀態已發佈 - 2022 9月

ASJC Scopus subject areas

  • 地質學

指紋

深入研究「Gouge fabrics reset by thermal pressurization record stress on faults after earthquakes」主題。共同形成了獨特的指紋。

引用此