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Moment tensor inversion and source rupture process of the September 27, 2003 M_S=7.9 earthquake occurred in the border area of China, Russia and Mongolia

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Acta Seismologica Sinica(English Edition) 2005年第3期18卷 255-268,378页

作者：赵翠萍陈章立郑斯华刘杰 Institute of Geophysics China Earthquake AdministrationBeijing 100081ChinaInstitute of Earthquake ScienceChina Earthquake AdministrationBeijing 100036ChinaEarthquake Administrationof Xinjiang Uygur Autonomous Regionürümqi830011China Institute of Earthquake Science China Earthquake AdministrationBeijing 100036China

plane with the strike of 127°, the dip of 79° and the rake of 171°. The rupture process inversion result of MS=7.9 earthquake shows that the total rupture duration is about 37 s, the scalar moment tensor is M0=0.97 × 1020 N·m. rupture mainly occurred on the shallow area with 110 km long and 30 km wide, the location in which the rupture initiated is not where the main rupture took place, and the area with slip greater than 0.5 m basically lies within 35 km deep middle-crust under the earth surface. The maximum static slip is 3.6 m. There are two distinct areas with slip larger than 2.0 m. We noticed that when the rupture propagated towards northwest and closed to the area around the MS=7.3 hypocenter, the slip decreased rapidly, which may indicate that the rupture process was stopped by barriers. The consistence of spatial distribution of slip on the fault plane with the distribution of aftershocks also supports that the rupture is a heterogeneous process owing to the presence of barriers.

关键词： earthquake occurred in the boundary area of China Russia and Mongolia moment tensor inversion source rupture process barrier

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source rupture process inversion of the 2013 Lushan earthquake,China

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Geodesy and Geodynamics 2013年第2期4卷 16-21页

作者： Zhang Lifen Iman Fatchurochman Liao Wulin Li Jinggang Wang Qiuliang Key Laboratory of Earthquake Geodesy Institute of SeismologyChina Earthquake Administration Institute of Geophysics China Earthquake Administration Indonesian Agency for Meteorology Climatology and Geophysics (BMKG)

The spatial and temporal slip distribution of the Lushan earthquake was estimated using teleseismic body wave data. To perform a stable inversion, we applied smoothing constraints and determined their optimal relative weights on the observed data using an optimized Akaike＇ s Bayesian Information Criterion （ABIC）. The inversion generated the source parameters. Strike, dip and slip were 218°, 39° and 100. 8° ,respectively. A seismic moment （M0） was 2. 1 × 10^20 Nm with a moment magnitude （Mw） of 6. 8, and a source duration was approximately 30 second. The rupture propagated along the dip direction, and the maximum slip occurred at the hypocenter. The maximum slip was approximately 2. 1 m, although this earthquake did not cause an apparent surface rupture. The energy was mainly released within 10 second. In addition, the Lushan earthquake was apparently related to the 2008 Wenchuan earthquake. However, the question of whether it was an aftershock of the Wenchuan earthquake requires further study.

关键词： source rupture process teleseismic wave Lushan earthquake

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