CO-SEISMIC SLIP DISTRIBUTION OF THE 2001 WEST OF KUNLUN MOUNTAIN PASS EARTHQUAKE INVERTED BY GPS AND LEVELING DATA
CO-SEISMIC SLIP DISTRIBUTION OF THE 2001 WEST OF KUNLUN MOUNTAIN PASS EARTHQUAKE INVERTED BY GPS AND LEVELING DATA
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发表时间：
2004
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通讯作者：
W. Yong
中科院分区：
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作者：
W. Yong
通过对震前、震后的GPS实测数据以及1979年和2002年的水准测量数据进行分析，得到了2001年昆仑山口西侧地震的同震位移场。利用这些数据，以震后实测的详细地表破裂数据为约束，反演了沿地震断层的同震滑移分布。结果表明，破裂深度下限为14.2～21km（置信度70%），最佳值为17km。结果还表明，在太阳湖段与主破裂带西端之间的区域，虽然没有观测到地表破裂，但存在2～3m的左旋走滑。这与InSAR数据分析结果一致。此次地震的地下破裂终止于西边的太阳湖，但在地表破裂带以东30km范围内似乎仍存在1.5～2.0m的左侧滑移。本研究反演的垂直位移表明，在93°E以西，断裂带南侧抬升，而在93°E以东，断裂带北侧抬升。根据大地测量资料和地表破裂测量估算出的释放地震矩为6.1×10 20 N·m，与地震波记录反演的结果一致。
The co seismic displacement field of the 2001 west of Kunlun Mountain Pass earthquake is obtained through the analysis of GPS data mea￣sured before and after the earthquake and leveling data measured in 1979 and 2002. Adopting these data, constrained by detail surface rupture data mea￣sured after the earthquake, we inverted the co seismic slip distribution along the seismic fault. The result shows that the depth of rupture lower limit is 14.2～21km (with 70% confidence level), with 17km as the optimal value. The result also shows that left lateral strike slip of 2～3m exists in the area between the Sun Lake segment and the west end of the main rupture zone, although surface rupture is not observed there. This is consistent with the result of InSAR data analysis. The subsurface rupture of this earthquake is ended at the Sun Lake in the west, but it seems that left lateral slip of 1.5～ 2.0m still exists within the range of 30km to the east of the surface rupture zone. The vertical displacement inverted in this study shows that to the west of 93°E the southern side of the fault is eleva￣ted, while to the east of 93°E the northern side of the fault is elevated. The released seismic moment estimated by geodetic data and surface rupture surveying is 6.1×10 20 N ·m, consistent with the result inverted by seismic wave records.