Fault mirrors in seismically active fault zones: A fossil of small earthquakes at shallow depths

Li Wei Kuo, Sheng Rong Song, John Suppe, En Chao Yeh

研究成果: 雜誌貢獻文章

17 引文 斯高帕斯(Scopus)

摘要

Fault mirrors (FMs) are naturally polished and glossy fault slip surfaces that can record seismic deformation at shallow depths. They are important for investigating the processes controlling dynamic fault slip. We characterize FMs in borehole samples from the hanging wall damage zone of the active Hsiaotungshi reverse fault, Taiwan. Here we report the first documented occurrence of the combination of silica gel and melt patches coating FMs, with the silica gel resembling those observed on experimentally formed FMs that were cataclastically generated. In addition, the melt patches, which are unambiguous indicators of coseismic slip, suggest that the natural FMs were produced at seismic rates, presumably resulting from flash heating at asperities on the slip surfaces. Since flash heating is efficient at small slip, we propose that these natural FMs represent fossils of small earthquakes, formed in either coseismic faulting and folding or aftershock deformation in the active Taiwan fold-and-thrust belt.

原文英語
頁(從 - 到)1950-1959
頁數10
期刊Geophysical Research Letters
43
發行號5
DOIs
出版狀態已發佈 - 2016 三月 16

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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