基于PS-InSAR方法反演北京地区地表沉降速率  

GROUND SUBSIDENCE RATES OF BEIJING AREA INVERSED BY PS-INSAR ANALYSIS

作　　者：罗三明[1] 杜凯夫[1] 畅柳[1] 万文妮[1] 杜雪松[1] 余敏[1] 杨博[1] 

机构地区：[1]中国地震局第一监测中心,天津300180

出　　处：《大地测量与地球动力学》2014年第1期43-46,共4页Journal of Geodesy and Geodynamics

基　　金：中国地震局地震研究所所长基金(IS201266111);中国地震局地震科技星火计划项目(XH13036)

摘　　要：选用27景ENVISAT降轨雷达干涉数据,利用相干点目标PS-InSAR技术进行时间序列处理,获取了北京及周边地区2006—2010年地表形变场。研究结果表明:1)在北京及周边地区存在双桥、廊坊、燕郊镇、张喜庄、杨各庄、平谷和沙河镇等7个沉降中心,其中沉降速率最大的为北京的双桥与河北的廊坊,两个沉降中心区平均沉降速率(LOS)分别为-27.19±5.66 mm/a与-24.65±5.14 mm/a;2)沉降面积最大的为双桥沉降区,约230 km2;3)北京市区地表年回升速率为10.92±3.24 mm/a,表明自20世纪80年代以来采取的回灌措施对防治地面沉降起到了抑制作用;4)北部山区为相对上升,表明区域地质构造作用的影响仍然存在。The major advantage of PS-InSAR is inversion of ground surface slow change for a long time based on high coherent targets. Using 27 single look complex（SLC）Envisat ASAR images over Beijing area, the ground surface deformation field during 2006-2010 and its details were obtained with PSInSAR method . The results show that ： （ 1 ） There were 7 subsidence centers ： Shuangqiao, Langfang, Yanjiao, Zhangxizhuang, Yanggezhuang, Ping- gu and Shahe. The subsidence rates of Shuangqiao and Langfang are largest, with a maximum rate of -27.19 ± 5. 66 mm/a and - 24.65 ± 5.14 mm/a respectively. （2） The largest subsidence region is Shuangqiao, its size is a-bout 230 km^2. （ 3 ） The subsidence of Beijing city rebounded continuously with a rate of 10.92 ± 3.24 mm/a. That means that the recharge since the 1980s prevents ground subsidence. （4）The uplift in northern mountains suggests that the impact of regional tectonic movement has been continuously growing.

关 键 词：PS—InSAR 时间序列 北京地区 地表变化 沉降速率 

分 类 号：P315.726[天文地球—地震学]