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Journal: |
Geophysical Research Letter 2009 No.4
clicks:900 |
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Title:
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Author:
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Tomokazu Kobayashi,Youichiro Takada,Masato Furuya,Makoto Murakami |
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Adress: |
Institute of Seismology and Volcanology, Graduate School of Science, Hokkaido University, Sapporo, Japan |
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Abstract:
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We have detected detailed ground displacements in the proximity of the Longmen Shan fault zone (LMSFZ) by applying a SAR offset‐tracking method in the analysis of the 2008 Sichuan earthquake. An elevation‐dependent correction is indispensable for achieving sub‐meter accuracy. A sharp displacement discontinuity with a relative motion of ∼1–2 m appears over a length of 200 km along the LMSFZ, which demonstrates that the main rupture has proceeded on the Beichuan fault (BF) among several active faults composing the LMSFZ, and a new active fault is detected on the northeastward extension of the BF. The rupture on the BF is characterized by a right‐lateral motion in the northeast, while in the southwest an oblique right‐lateral thrust slip is suggested. In contrast to the northeast, where a major rupture proceeded on the BF only, in the southwest multiple thrust ruptures have occurred in the southeastern foot of the Pengguan massif. |
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Comment: |
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