基于多源遥感影像易县台伸缩仪张性异常

EW Tension Anomaly of the Extensometer in Yixian Seismic Station Based on Multi-source Remote Sensing Data

针对易县伸缩仪EW向2019年3月8日出现的张性异常,从洞室环境、仪器系统、供电系统和环境干扰等方面进行调查和分析,采用具有穿透能力的Sentinel-1A合成孔径雷达数据和光谱信息丰富的Landsat8 OLI遥感影像作为主要数据源,通过人工解译、统计分析方法和差分雷达干涉测量技术,获取台站周边地面环境变化和确定干扰源的空间分布,定量分析采石场和土石场地面荷载变化对伸缩仪观测的影响,结果显示此项异常为周围环境干扰引起的地面荷载变化所致。

According to the EW tension anomaly of the extensometer in Yixian Seismic Station on March 8,2019,we survey and analyze the cavern environment,instrument system,power supply system and environmental disturbance,and so on.Using the systhetic aperture radar data(Sentinel-1A)which has the penetration ability to the earth surface and the remote sensing data(Landsat-8 OLI)which has abounding spectrum information,we obtain the ground environment changes around the station,found the spatial distribution of interference sources,quantitatively analyze the effect of load influences including quarry and soil excavating on the observation of the extensometer by means of artificial interpretation and statistical analysis and technology of differential interferometric synthetic radar.The result shows that the anomaly is caused by environmental disturbance.