Real-time seismology for the 05/12/2008 Wenchuan earthquake of China: A retrospective view |
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| Authors: | KeSong Wan SiDao Ni XiangFang Zeng Sommerville Paul |
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| Institution: | (1) Mengcheng National Geophysical Observatory, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China;(2) United Research Services Corporation, Pasadena, CA 91101, USA |
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| Abstract: | The devastating 05/12/2008 Wenchuan earthquake (Mw7.9) in Sichuan Province of China showed very few precursory phenomena and occurred on a fault system once assigned to be
of moderate long term seismic risk. Given the existing coverage of seismograph stations in Sichuan Province, real-time seismology
could have been effective in avoiding some earthquake damage and helping post-earthquake emergency response. In a retrospective
view, we demonstrated that the epicenter can be located with 20 km accuracy using just two broadband stations with three-component,
which takes only about 10 s after the onset of the earthquake. Initial magnitude is estimated to be M7 with the Tc measurement
over first 4 seconds of P waves. Better magnitude estimate can be obtained within 2 min by modeling Pnl waves for stations
about 500 km away where the S waveforms are clipped. The rupture area is well revealed by teleseismically-recorded >M5 early
aftershocks within two hours after the mainshock. Within a few hours, teleseismic body waves were inverted to derive a more
detailed rupture process and the finite fault model can be readily used to calculate ground motions, thus providing vital
information for rescue efforts in the case where no real-time strong motion records are available.
Supported by the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KZCX2-YW-116-1) and National Key
Technology Research and Development Program of China (Grant No. 2006BAC03B00) |
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| Keywords: | real-time seismology earthquake early warning strong ground motion rapid location |
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