| 2008年10月当雄MW6.3级地震断层参数的InSAR反演及其构造意义 |
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| 引用本文： | 冯万鹏,许力生,李振洪.2008年10月当雄MW6.3级地震断层参数的InSAR反演及其构造意义[J].地球物理学报,2010,53(5):1134-1142. |
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| 作者姓名： | 冯万鹏 许力生 李振洪 |
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| 作者单位： | 1.中国地震局地球物理研究所,北京 100081;2.Department of Geographical and Earth Sciences, University of Glasgow, Glasgow G12 8QQ, United Kingdom |
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| 基金项目： | 中国地震局地球物理研究所中央级基本科研业务专项（018903）和国家自然科学基金（40874026）资助. |
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| 摘 要： | 2008年10月6日在西藏当雄发生了MW6.3地震.我们从一对降轨ENVISAT ASAR资料获得了这次地震的同震位移场，通过同震位移场的反演确定了发震断层参数.并且应用一维变异理论评估了InSAR结果中的误差协方差矩阵，直接用于评价断层反演参数的不确定性水平.结果表明，此次地震发生于羊易盆地东缘的次级断层，走向178°，倾角58°，倾向近正西，以正断层运动为主，兼具少量右旋走滑分量，且资料的误差水平对反演结果的影响不大.这次地震引起震中位置地表下沉至少30 cm，似乎是亚东-谷露裂谷带北段的羊易地堑下沉的表现.
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| 关 键 词： | 当雄地震 InSAR反演 不确定性 亚东-谷露裂谷带 |
| 收稿时间： | 2009-12-16 |
| 修稿时间： | 2010-03-05 |
Fault parameters of the October 2008 Damxung MW 6.3 earthquake from InSAR inversion and its tectonic implication |
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| FENG Wan-Peng,XU Li-Sheng,LI Zhen-Hong.Fault parameters of the October 2008 Damxung MW 6.3 earthquake from InSAR inversion and its tectonic implication[J].Chinese Journal of Geophysics,2010,53(5):1134-1142. |
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| Authors: | FENG Wan-Peng XU Li-Sheng LI Zhen-Hong |
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| Institution: | 1.Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;2.Department of Geographical and Earth Sciences, University of Glasgow, Glasgow G12 8QQ, United Kingdom |
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| Abstract: | An 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. |
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| Keywords: | Damxung Earthquake InSAR inversion Uncertainty Yadong-Gulu rift belt |
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