地震研究

基于PS-InSAR技术,利用欧空局28景ENVISAT ASAR数据,运用小基线集干涉处理方法,提取并分析了丽江断裂2003～2010年的平均形变速率。研究结果显示:(1)丽江断裂具左旋走滑形变特征;(2)年平均LOS向形变速率在3～5 mm/a之间,与地质资料较吻合。该研究为丽江地区地震预测提供一种可靠的断裂带活动数据,但丽江断裂进入城区后受城市化活动影响,断裂形变与地面沉降信息共存,较难分离。

Based on the PS-InSAR technology,using ENVISAT ASAR data of ESA(European Space Agency),we extracted and analyzed the average deformation rate of the Lijiang Fault from 2003 to 2010 by small baseline set interference processing method. The research results demonstrated that:(1)The deformation characteristic of Lijiang Fault showed the sinistral strike-slip;(2)The annual deformation rate in LOS direction was between 3 mm/a and 5 mm/a,and consistented with geological data. This research could provide the credible fault zone activity date for the earthquake forecast of the Lijiang region. However,because of the section of Lijiang Fault into the city was affected by urbanization,and fault deformation and ground subsidence information of the Lijiang Fault were coexisted,it was difficult to separate.

引言
1 PS-InSAR数据处理方法
2 形变信息提取与分析
3 结论

表1 ASAR数据(垂直基线距由DORIS精密轨道计算)<br/>Tab.1 ASAR Data(vertical baseline distance is calculated by DORIS precise orbit)

表1 ASAR数据(垂直基线距由DORIS精密轨道计算)
Tab.1 ASAR Data(vertical baseline distance is calculated by DORIS precise orbit)

图1 丽江地区区域新构造环境(据韩竹军等(2004))<br/>Fig.1 The new regional tectonic environment of Lijiang area(according to Han et al(2004))

图1 丽江地区区域新构造环境(据韩竹军等(2004))
Fig.1 The new regional tectonic environment of Lijiang area(according to Han et al(2004))

图2 小基线集组合的109对干涉像对<br/>Fig.2 The 109 pairs of small baseline sets combinations

图2 小基线集组合的109对干涉像对
Fig.2 The 109 pairs of small baseline sets combinations

图3 叠加在DEM上的平均速率<br/>Fig.3 The mean velocity superimposed on the DEM in LOS direction

图3 叠加在DEM上的平均速率
Fig.3 The mean velocity superimposed on the DEM in LOS direction

图4 平均速率标准偏差<br/>Fig.4 The standard deviation of mean velocity in LOS direction

图4 平均速率标准偏差
Fig.4 The standard deviation of mean velocity in LOS direction

图5 丽江断裂形变剖面线<br/>Fig.5 Deformation section line of the Lijiang Fault

图5 丽江断裂形变剖面线
Fig.5 Deformation section line of the Lijiang Fault

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备注

引言

1 PS-InSAR数据处理方法

2 形变信息提取与分析

3 结论

期刊信息