<span>玛尼地震的InSAR形变研究与模拟</span>-华南地震

文章信息/Info

作者:: 石晓春1; 王长委2; 余鹏飞3; 杜志彪4; 1.广东省国土资源测绘院，广州 510500；2.华南农业大学资源环境学院，广州 510642；3.中国地震局地震研究所（地震大地测量重点实验室），武汉 430071；4.广州港工程管理有限公司，广州 510730

Author(s):: SHI Xiaochun1; WANG Changwei2; YU Pengfei3; DU Zhibiao4; 1. Institute of Surveying and Mapping，Lands and Resource Department of Guangdong Province，Guangzhou 510500，China；2. College of Natural Resources and Environment，South China Agricultural University，Guangzhou 510642，China；3. Key Laboratory of Earthquake Geodesy，Institute of Seismology，China Earthquake Administration，Wuhan 430071，China；4. Guangzhou Port Engineering Management Co. Ltd，Guangzhou 510730，China

Keywords:: Synthetic Aperture Radar Intcrferometry(InSAR); Manyi earthquake; Co-seismic deformation; Dislocation theory in elastic half space

摘要:: 采用欧洲空间局ERS-2的星载干涉雷达数据，选取1997年11月8日MW7.6级玛尼地震作为研究对象，采用了差分干涉方法，在通过对覆盖同一地区的SAR数据进行差分干涉处理，得到了玛尼地震的视线向同震形变场。经研究发现：该地震形变场呈长轴近北东东向不规则椭圆形分布，地表破裂带长度约为130 km，发震断层走向约为78°，断裂为左行走滑特征。断层以南为隆起区，在发震断层附近最大视线向隆起位移量为113.6 cm，断层以北为沉降区，最大视线向沉降位移量为170.4 cm。基于Okada模型实现了具有复杂结构的4段断层段参数的InSAR形变场数据模拟，获得断层的最大走滑为6 m，估计出玛尼地震的标量地震矩M0为2.69×1020 Nm，计算得到的矩震级MW为7.6。证明了研究方法的正确性和研究结论的可靠性。

Abstract:: By using the spaceborne Interferometric Radar Data of ESA ERS-2，taking the Mani MW7.6 earthquake on November 8th 1997 as the research object，the line-of-sight co-seismic deformation field of the Mani earthquake is obtained by using differential interferometric method to process the SAR data covering the same area. Results show that the seismic deformation field is irregular elliptical distribution along the long axis near NE and east direction, with a surface rupture zone length about 130 km, the strike of the seismogenic fault is about 78°，and the fault is characterized by left strike-slip. The south of the fault is the uplift area，has a maximum line-of-sight uplift displacement near the seismogenic fault as 113.6 cm，and the north of the fault is the subsidence area，has a maximum line-of-sight settlement displacement is 170.4 cm. Thanks to Okada model，the InSAR deformation field data of four fault segments with complex structure parameters are simulated，the maximum strike slip of the fault is got as 6 m，and the scalar seismic moment M0 of the Mani earthquake is estimated to be 2.69×1020 Nm，and the moment magnitude MW is calculated as 7.6. All of the above results prove that the research methods are correct and research conclusions are reliable.