SAR差分干涉测量技术在地震区域形变测量中的应用研究

合成孔径雷达(SAR)差分干涉测量是一种最新的大地形变测量遥感技术方法.利用欧洲空间局1996年4月15日获取的地球资源卫星ERS-1数据和4月16日获取的ERS-2数据,以及1997年12月2日获取的ERS-2数据,应用差分干涉测量技术对发生于1997年11月8日的西藏玛尼地震进行了提取区域形变场的应用研究.从得到的变化检测条纹图中可识别出地表破裂带,并可定量推算震中周围和两条断裂带附近的变形情况.分析结果表明:断裂为左行平移性质,断裂带南侧水平错动的最大变形量至少超过2.8 m,北侧水平错动的最大变形量至少超过1.75 m.差分干涉测量分析结果与地面调查及已有的相关研究资料符合得很好.

SAR Differential Interferometry Technology Application to Earthquake Regional Deformation Surveying

SAR differential interferometry is an up-to-date measurement technology for terrain deformation. In this paper, an application example concerning Mani earthquake in Tibet, occurred on Nov. 8, 1997, is presented. In this paper, the distribution of surface deformation and extract displacement information of the earthquake rupture zone using SAR differential interferometry are studied. The data set related to our study area are ERS1/2 SLC SAR images (April 15, April 16, 1996 ERS-1 and Dec. 2, 1997 ERS-2) provided by European Space Agency. We analyzed factors related to the surface deformation detecting interferogram along the Margaichace-Ruolacuo fault under the special regional environmental conditions. From the resultant changing interferogram of Mani Earthquake, the surface rupture zone can be recognized. Also we concluded from analyzing the fringe patterns that left-lateral shear movement is the whole deforming mechanism, furthermore, the offsets are quantitatively estimated. We inferred that the horizontal offset displacement for the southern side at least reaches 2.8 m and 1.75 m at least for the northern side of the fault. All these results greatly correspond with the ground measurements and its related research documents.