Applying InSAR technique to accurately relocate the epicentre for the 1999 Ms= 5.6 Kuqa earthquake in Xinjiang province, China
Applying InSAR technique to accurately relocate the epicentre for the 1999 Ms= 5.6 Kuqa earthquake in Xinjiang province, China
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DOI：
10.1111/j.1365-246x.2008.03994.x
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发表时间：
2009
影响因子：
2.8
通讯作者：
X. Zha;R. Fu;Z. Dai;P. Jing;S. Ni;Jinshui Huang
中科院分区：
文献类型：
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作者：
X. Zha;R. Fu;Z. Dai;P. Jing;S. Ni;Jinshui Huang
摘要1999年库车5.6级地震发生在天山与图尔库盆地之间的地震活动带上。由于地震台网稀疏，地壳结构复杂，利用地震波对此次地震震中进行精确定位十分困难。不同研究小组所确定的震中在20- 40公里的空间范围内各不相同。干涉合成孔径雷达（干涉合成孔径雷达）是一种空间分辨率高、精度好、覆盖范围广的大地测量技术。震中区的干涉图限制了这次地震的震中。库车地区干旱的气候和稀疏的植被为干涉合成孔径雷达研究提供了良好的条件。在本文中，我们首先构建了一个干涉图映射同震形变场由于1999年库车地震使用的同震干涉雷达图像对获得的欧空局ERS-2卫星。然后，我们开发了一种新的地理编码方法，并将其应用于干涉图。其次，我们根据发震机制和构造背景推断了发震断层的几何形状。为了模拟干涉图，我们假设位错埋在均匀的弹性半空间。最后，我们推断这次地震的震中位于（82.80东经，41.92北纬），这与美国地质勘探局国家地震信息中心和中国地震局的结果接近。现场调查结果表明，干涉合成孔径雷达福尔斯反演的震中位置落在新疆地震局描述的6级等震线上。
SUMMARY The 1999 M s = 5.6 Kuqa earthquake occurred in a seismically active belt between the Tianshan Mountain and the Traim basin. Because of the sparse seismic network and complex crustal structure, it is very difficult to accurately locate the epicentre for this event using seismic waves. The epicentres located by different research groups vary over a spatial range of 20– 40 km. Interferometric synthetic aperture radar (InSAR) is a geodetic technique with fine spatial resolution, good precision and wide coverage. An interferometric map of the epicentral region constrains the epicentre of this event. The arid climate and sparsely vegetation in the Kuqa region provide excellent conditions for InSAR studies. In this paper, we firstly construct a interferogram to map the coseismic deformation field due to the 1999 Kuqa earthquake using a coseismic interferometric pair of radar images acquired by the ESA ERS-2 satellite. Then, we develop a new geocoding method and apply it to the interferogram. Next, we infer the geometry of the seismogenic fault according to its focal mechanism and tectonic setting. To model the interferogram, we assume a dislocation buried in a uniform elastic half-space. Finally, we infer the epicentre of this earthquake to be located at (82.80 ◦ E, 41.92 ◦ N), which is close to the results of the National Earthquake Information Center of USGS and China Earthquake Administration. The epicentre location inferred from InSAR falls in the six-level isoseismal contour described by Xinjiang earthquake administration using the field investigations.