期刊
TECTONOPHYSICS
卷 584, 期 -, 页码 91-101出版社
ELSEVIER
DOI: 10.1016/j.tecto.2012.08.030
关键词
The 2008 Wenchuan earthquake; Xiaoyudong rupture; Paleoearthquake; Active fault
资金
- Basic Scientific Research Special Fund of the Chinese National Nonprofit Institutes [IGCEA1004]
- Wenchuan 8.0 earthquake emergency science investigation team of the China Earthquake Administration
Three faults were involved in the rupture process of the May 12, 2008 Mw7.9 Wenchuan earthquake, representing a rarely documented case of multiple faults rupturing simultaneously. Distinct from the other two major NE-trending surface ruptures, the similar to 7 km long Xiaoyudong surface rupture is oriented NW340 degrees and shows thrust- and left-slip faulting. In order to understand what role Xiaoyudong rupture played in the tectonic evolution of Longmenshan thrust system, we conducted a detailed investigation including geomorphic feature observation, coseismic displacement measurement, paleo-rupture event trenching, and fault kinematic estimation of the Xiaoyudong area. Our results not only document an in situ paleoearthquake occurring at 3.2-23 ka BP, but also present the Xiaoyudong rupturing event as an oblique thrust with minor components of left lateral slip. We also found vertical and sinistral slip rates estimated as 1.1-1.5 mm/yr and 0.5-0.7 mm/yr. respectively. Finally, we suggest that the Xiaoyudong rupture is not a passive tear fault but an active participator of slip partitioning on multiple faults within the Longmenshan thrust system, and moreover, it gave strong response to both the 2008 and the penultimate earthquake while it kept silence with the antepenultimate event. (C) 2012 Published by Elsevier B.V.
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