2023年云南保山M_(S)5.2地震同震形变研究  

Study on Coseismic Deformation of M_(S)5.2 Earthquake in Baoshan,Yunnan,in 2023

作　　者：陈丽 翁烨 Chen Li;Weng Ye(Information Center,Yunnan Earthquake Agency;Sichuan College of Architectural Technology)

机构地区：[1]云南省地震局信息中心,昆明市650200 [2]四川建筑职业技术学院测绘工程系,四川德阳618000

出　　处：《勘察科学技术》2025年第2期60-65,共6页Site Investigation Science and Technology

基　　金：国家重点研发课题(项目编号:2018YFC1503604)。

摘　　要：为探测2023年5月2日云南保山M_(S)5.2地震引发的地表形变量,该文采用升降轨合成孔径雷达差分干涉测量(DInSAR)技术,利用Sentinel-1A卫星提供的升降轨4景影像数据,结合AW3D30 m数字高程模型(DEM)及精密轨道数据,获取升降轨雷达视线向形变值,并将形变值叠加到DEM进行三维显示。研究结果显示,地震同震形变主要表现为在西北—东南方向上出现抬升和沉降现象,西北区为抬升区,东南区为沉降区;垂直向形变抬升和沉降幅度相当;形变分界线走向与震中周围的澜沧江、怒江等断裂带呈现交叉状态,但与大盈江断裂带走向一致,雷达视线向最大抬升量为6.97 cm,最大沉降量为5.78 cm。To investigate the surface deformation caused by the M_(S)5.2 earthquake in Baoshan,Yunnan Province on May 2,2023,this study employs the Differential Interferometric Synthetic Aperture Radar(DInSAR)technique with ascending and decending obits.By utilizing four ascending and descending orbit images from the Sentinel-1A satellite,in combination with the AW3D30 m Digital Elevation Model(DEM)and precise orbit data,the line-of-sight deformation values of ascending and descending orbits are obtained.These deformation values are then superimposed onto the DEM for three-dimensional visualization.The results show that the coseismic deformation of the earthquake is mainly manifested as uplift and subsidence in the northwest to southeast direction,with the northwest region experiencing uplift and the southeast region experiencing subsidence.The vertical uplift and subsidence are comparable in magnitude.The trend of the deformation boundary intersects with the Lancang River,Nujiang River and other fault zones around the epicenter,but aligns with the trend of the Dayingjiang fault zone.The maximum uplift in the line-of-sight is 6.97 cm,and the maximum subsidence is 5.78 cm.

关 键 词：保山地震 DINSAR 升降轨 同震形变 

分 类 号：P315.7[天文地球—地震学]