基于高频GNSS观测的甘肃积石山Ms 6.2地震同震形变  

Coseismic Deformation of the Ms 6.2 Jishishan Earthquake in Gansu Province Based on High-Frequency GNSS Observation

作　　者：李志才 陈智 武军郦[2] 周星 张鸣之 赵利江 余博尧 周佳 张澍 LI Zhicai;CHEN Zhi;WU Junli;ZHOU Xing;ZHANG Mingzhi;ZHAO Lijiang;YU Boyao;ZHOU Jia;ZHANG Shu(School of Geoscience and Surveying Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;Geodesy Depaetment,National Geomatics Centere of China,Beijing 100830,China;Surveying and Mapping Engineering Institute of Gansu Province,Lanzhou 730000,China;China Institute of Geo‑Environment Monitoring(Guide Center of Prevention Technology for Geo‑Hazard,MNR),Beijing 100081,China;Qinghai Institute of Basic Surveying and Mapping,Xining 810001,China;Beijing CNTEN Smart Technology Co.Ltd,Beijing 100029,China)

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [2]国家基础地理信息中心测绘基准部,北京100830 [3]甘肃省测绘工程院,甘肃兰州730000 [4]中国地质环境监测院(自然资源部地质灾害技术指导中心),北京100081 [5]青海省基础测绘院,青海西宁810001 [6]北京讯腾智慧科技股份有限公司,北京100029

出　　处：《武汉大学学报(信息科学版)》2025年第2期236-246,共11页Geomatics and Information Science of Wuhan University

基　　金：国家重点研发计划(2021YFC3000503);中国地震局地震预测研究所基本科研业务费(CEAIEF2022010101)。

摘　　要：2023-12-18发生的甘肃积石山6.2级地震造成了重大的人员伤亡。收集了不同系统32个卫星导航定位基准站(continuously operating reference stations,CORS)当天的高频全球导航卫星系统(global navigation satellite system,GNSS)观测数据,进行了高精度动态单历元数据处理。结果发现,震中附近50 km以内的高频GNSS可以监测到明显的同震形变波形,峰值变化最大达到50~60 mm;地震永久变形主要影响范围为距离震中30 km的区域,距离震中5 km的测站记录到东西向永久变形~13 mm、南北向变形~10 mm,以及~8 mm的垂向变形。采用自适应噪声完全集合经验模态分解方法对高频GNSS波形信号进行分解,可分离出明显的同震形变信号,最远可探测到距离震中100 km。采用模态分解方法可探测出更多的同震信号,这为利用丰富的CORS资源监测地震的同震形变提供更多可行性。Objectives:The aim of this study is to obtain a high-precision coseismic deformation field of an Ms 6.2 magnitude earthquake occurred in Jishishan County,Gansu Province,China from high‑frequency global navigation satellite system(GNSS)observation data,which will enable the real-time monitoring of deformations for earthquakes with a magnitude of 6 or higher using a massive network of continuously operating reference stations(CORS).Methods:This study employed the PRIDE 3.0 software developed by Wuhan University for high-precision dynamic processing of 32 CORS with high-frequency data,obtaining coseismic deformation time series for each station.For stations showing significant coseismic responses in close proximity,dynamic solutions with large changes at the seismic moment were first excluded.The smoothed single-epoch results before and after the earthquake were retained.For stations with less obvious coseismic responses,the complete ensemble empirical mode decomposition with adaptive noise(CEEM‑DAN)method was used to detect high-frequency coseismic signals.Results:The main range of permanent deformation caused by earthquake is in the area 30 km away from the epicenter.Stations 5 km away from the epicenter recorded permanent deformation in the east-west direction of 13 mm,north-south direction of 10 mm,and vertical deformation of 8 mm.Modal decomposition identified 13 stations with seismic responses in the east or north directions,including CORS LXJS,GUTI,LXYJ within a 40 km radius from the epicenter.It could detect the seismic deformation far from 100 km better than the original GNSS results,which means this method could be used for waveform signal reconstruction,noise removal,and expanding the distance of CORS monitoring for coseismic signals.Conclusions:This study indicate that various types of CORS equipment with different foundation can monitor earthquake signals.The CEEMDAN method for signal decomposition can detect coseismic signals faraway,providing feasibility for monitoring seismic coseismic deformatio

关 键 词：定位基准站 高频GNSS观测 同震形变 2023年积石山地震 

分 类 号：P228[天文地球—大地测量学与测量工程]