2008年10月当雄 M W 6.3级地震断层参数的InSAR反演及其构造意义
2008年10月当雄 M W 6.3级地震断层参数的InSAR反演及其构造意义
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DOI：
10.3969/j.issn.0001-5733.2010.05.014
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发表时间：
2010-05
期刊：
影响因子：
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通讯作者：
冯万鹏;许力生;李振洪
中科院分区：
文献类型：
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作者：
冯万鹏;许力生;李振洪
2008年10月6日，西藏当雄发生Mw6.3地震。我们利用ENVISAT ASAR影像的下降同震干涉图确定了断层参数。此外，我们使用一维半变异函数估计的 InSAR 数据点的方差-协方差矩阵检查了 InSAR 导出的源参数的不确定性。反演结果显示，地震发生在阳邑盆地东缘的一条次级断裂上，走向178°，倾角58°，向西倾斜，为正断层，有少量右旋走滑。测量误差对 InSAR 导出源参数的不确定性的影响似乎也是有限的。此次地震导致震中至少下沉30厘米，表明亚东-古鲁裂谷带北部的阳邑盆地可能正在下沉。
A Mw6.3 earthquake occurred in Damxung, Tibet, on October 6th, 2008. We determined the fault parameters using a descending coseismic interferogram from ENVISAT ASAR images. In addition， we examined the uncertainties in the InSAR-derived source parameters using the variance-covariance matrix of InSAR data points estimated with a 1-D semivariogram function. The inverted results showed that the earthquake occurred on a secondary fault in the eastern margin of the Yangyi basin, with a strike of 178°, a dip of 58° and dipping to west, which was normal faulting with a little of right-lateral strike slipping. It also appeared that the impact of the measurement errors on the uncertainties in InSAR derived source parameters was limited. This earthquake led to a subsidence of at least 30 cm at the epicenter, implying the Yangyi basin in the northern Yadong-Gulu Rift Belt was subsiding probably.