Brushlines in fault pseudotachylytes: A new criterion for coseismic slip direction

Eric C. Ferré*, En Chao Yeh, Yu Min Chou, Ruo Lin Kuo, Hao Tsu Chu, Caitlyn S. Korren

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

6 引文 斯高帕斯(Scopus)

摘要

Striations along fault planes, such as slickensides, generally indicate slip direction. These linear structures typically form through friction between two solids. Here we describe brushlines, a new class of fault striation in pseudotachylytes, formed during coseismic slip at the interface between host rock and frictional melt. Unlike slickensides, brushlines primarily lack longitudinal step-like asymmetry and display a hemicylindrical morphology. This new class of striation forms while the frictional melt has sufficiently low viscosity to be brushed along the direction of coseismic displacement by small asperities on the host-rock block. In the Hoping River pseudotachylytes of eastern Taiwan, the long axis of brushlines is parallel to the earthquake slip direction determined using the offset of piercing points across the fault. This study shows that the pseudotachylyte-host rock interface may host previously overlooked, invaluable coseismic kinematic information.

原文英語
頁(從 - 到)395-398
頁數4
期刊Geology
44
發行號5
DOIs
出版狀態已發佈 - 2016 五月 1

ASJC Scopus subject areas

  • 地質學

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