摘要
2021年3月19日西藏自治区那曲市比如县发生M_(S)6.1地震,因西藏地区地球物理台站少且分布稀疏,无法较好地获取地震发生前后地球物理场变化信息。基于Sentinel-1卫星升、降轨SAR数据及数字高程模型SRTM3,利用合成孔径雷达差分干涉测量技术(DInSAR)技术,获取震区地震同震形变场信息,判断地表形变场的变化。结果表明:本次地震由正断兼走滑的断层运动造成,升、降轨沿雷达视线向的最大沉降量分别为2.4 cm(升轨)和2.8 cm(降轨),最大抬升量分别为0.6 cm(升轨)和3.5 cm(降轨)。
On March 19,2021,an earthquake with M_(S)6.1 occurred in Nagqu City,Tibet Autonomous Region.Due to the few geophysical stations in Tibet and their sparse distribution,it is impossible to obtain the change information in the geophysical field before and after the earthquake.Based on Sentinel-1 satellite ascending and descending SAR data and digital elevation model SRTM3,the coseismic deformation field information of earthquake area is obtained by using differential synthetic aperture radar interferometry(DInSAR)technology,and the change of surface deformation field is judged.The results show that the earthquake was caused by normal fault and strike-slip fault movement.The maximum subsidence of the ascending and descending tracks along the radar line of sight are 2.4 cm(ascending track)and 2.8 cm(descending track)respectively,and the maximum uplift are 0.6 cm(ascending track)and 3.5 cm(descending track)respectively.
作者
桑杰卓玛
索朗南杰
次仁多吉
格桑卓玛
Sangjiezhuoma;Suolangnanjie;Cirenduoji;Gesangzhuoma(Earthquake Agency of Tibet Autonomous Region,Lhasa 850000,China)
出处
《地震地磁观测与研究》
2023年第2期134-140,共7页
Seismological and Geomagnetic Observation and Research
基金
中国地震局地震监测、预报、科研三结合课题(项目编号:3JH-202201032)。
