Wiley-Blackwell;WASHINGTON: American Geophysical Union (AGU)
摘要:
摘要： AbstractFault 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. 出版者： WASHINGTON: American Geophysical Union (AGU) 出版日期： 2016-03 出處： Geophysical Research Letters, 2016-03, Vol.43 (5), p.1950-1959 資源來源： Wiley Online Library - AutoHoldings Journals;Web of Science Primary (SCIE, SSCI & AHCI);Scopus 識別號： ISSN: 0094-8276 識別號： ISSN: 1944-8007 識別號： EISSN: 1944-8007 識別號： DOI: 10.1002/2015gl066882
