地震研究

冕宁跨断层水准场地1-1C测段观测曲线从2016年6月开始出现大幅度突降,这是自汶川8.0级地震后四川地区出现的显著巨幅异常。针对该异常,使用Sentinel-1卫星影像数据,利用SBAS技术对冕宁跨断层场地进行沉降监测,通过SBAS-InSAR技术获取了变空间范围和幅度以及形变时间序列曲线。结果表明:(1)从空间看,形变中心位于西康温泉井附近;(2)从形变时间序列曲线上可以看出,沉降发生的时间与西康温泉井活动一致。因此,认为此形变是由西康温泉井抽水引起的。

The section 1-1C of the Mianning cross-fault site began to undergo a sharp drop in June 2016.It is a significant anomaly that occurred in the Sichuan region since the Wenchuan M8.0 earthquake.In response to the anomaly,this paper uses Sentinel-1 image data to monitor the subsidence of the cross-fault site in Mianning with the SBAS technology.The spatial extent and amplitude of the topographic variations and the time series curves of the deformation in the Mianning cross-fault field are obtained.InSAR deformation field results show that,first,from the perspective of space,the deformation center is located near the well of Xikang Hot Spring.Second,from the time series curve of deformation,it shows that the subsidence time coincides with the Xikang hot spring well activity.Therefore,we believe that the deformation should be caused by the pumping of the Xikang Hot Spring well.

引言
1 研究区概况
2 技术方法与数据处理
3 沉降监测结果分析
4 结论

图1 冕宁跨断层场地1-3测段水准历史资料(a)和周边地震分布图(b)<br/>Fig.1 Historical data of the leveling measurement of the section 1-3(a)and surrounding seismic distribution map(b)of the Mianning cross-fault site

图1 冕宁跨断层场地1-3测段水准历史资料(a)和周边地震分布图(b)
Fig.1 Historical data of the leveling measurement of the section 1-3(a)and surrounding seismic distribution map(b)of the Mianning cross-fault site

图2 冕宁跨断层场地水准测量点及其附近活动断裂<br/>Fig.2 Levelling points of the Mianning cross-fault site and active faults near the site

图2 冕宁跨断层场地水准测量点及其附近活动断裂
Fig.2 Levelling points of the Mianning cross-fault site and active faults near the site

表1 14景哨兵1影像数据参数<br/>Tab.1 Parameters of 14 Sentinel-1 images

表1 14景哨兵1影像数据参数
Tab.1 Parameters of 14 Sentinel-1 images

图3 干涉对时空基线<br/>Fig.3 Spatial-temporal baselines of interfergrams

图3 干涉对时空基线
Fig.3 Spatial-temporal baselines of interfergrams

图4 冕宁跨断层场地形变速率图(视线方向)<br/>Fig.4 Deformation rate of the Mianning cross-fault site(line of sight)

图4 冕宁跨断层场地形变速率图(视线方向)
Fig.4 Deformation rate of the Mianning cross-fault site(line of sight)

图5 沿沉降区域由内向外所选取的ABCDE五点示意图<br/>Fig.5 Five points of ABCDE selected from inside to outside in the subsidence area

图5 沿沉降区域由内向外所选取的ABCDE五点示意图
Fig.5 Five points of ABCDE selected from inside to outside in the subsidence area

图6 ABCDE五点的形变时间序列曲线(视线方向)<br/>Fig.6 Deformation time series curves of the ABCDE points(line of sight)

图6 ABCDE五点的形变时间序列曲线(视线方向)
Fig.6 Deformation time series curves of the ABCDE points(line of sight)

图7 1-3支线、1-2支线和2-3支线水准观测值<br/>Fig.7 Leveling observations of the branch 1-3,branch 1-2,and branch 2-3

图7 1-3支线、1-2支线和2-3支线水准观测值
Fig.7 Leveling observations of the branch 1-3,branch 1-2,and branch 2-3

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引言

1 研究区概况

2 技术方法与数据处理

3 沉降监测结果分析

4 结论

期刊信息