结合野外考察的2022年门源M_(S)6.9地震地表破裂带的高分七号影像特征  

THE SURFACE RUPTURE CHARACTERISTICS BASED ON THE GF-7 IMAGES INTERPRETATION AND THE FIELD INVESTIGA-TION OF THE 2022 MENYUAN M_(S)6.9 EARTHQUAKE

作　　者：王辽 谢虹[1,2] 袁道阳 李智敏 薛善余[1] 苏瑞欢 文亚猛 苏琦 WANG Liao;XIE Hong;YUAN Dao-yang;LI Zhi-min;XUE Shan-yu;SU Rui-huan;WEN Ya-meng;SU Qi(Lanzhou Institute of Seismology,China Earthquake Administration,Lanzhou 730000,China;Lanzhou National Observatory of Geophysics,Lanzhou 730000,China;School of Earth Sciences,Lanzhou University,Lanzhou 730000,China;Qinghai Earthquake Agency,Xining 810001,China;Faculty of Arts and Sciences,Beijing Normal University at Zhuhai,Zhuhai 519000,China)

机构地区：[1]中国地震局兰州地震研究所,兰州730000 [2]甘肃兰州地球物理国家野外科学观测研究站,兰州730000 [3]兰州大学,地质科学与矿产资源学院,兰州730000 [4]青海省地震局,西宁810001 [5]北京师范大学珠海校区,文理学院,珠海519000

出　　处：《地震地质》2023年第2期401-421,共21页Seismology and Geology

基　　金：青海省重点研发与转化计划(2022-SF-138);国家自然科学基金(41302174,42172227)共同资助

摘　　要：2022年1月8日,青海省门源县发生了M_(S)6.9地震。为及时全面了解地震同震地表破裂带的空间分布并准确判定发震构造,文中通过对震后高分七号遥感影像进行解译判读,综合野外考察核实,获得了门源M_(S)6.9地震同震地表破裂带的展布情况,并识别出多种典型的同震破裂地貌,总结了多种同震地貌的影像特征。结果表明,此次地震产生了2条主要的地表破裂带,呈左阶斜列展布。北支主破裂带分布于冷龙岭断裂西段,长约22km,走向100°N~120°E;南支次级破裂带分布在托莱山断裂东段的局部段上,长约4km,走向为N90°E,2条破裂带总长约26km;沿破裂带形成了一系列典型左旋走滑同震地貌,如张裂隙、张剪裂隙、挤压脊、挤压鼓包、左旋纹沟、左旋断错路基等;在此基础上,文中还对冷龙岭地区典型左旋地貌的累积位错进行了测量,并与前人的测量结果作对比研究,得到了较为准确的测量结果。文中基于高分影像对断裂沿线典型的断错地貌开展研究,不仅可为高分七号卫星数据的地质应用积累实例,所得结果也可为未来构造地貌研究提供强有力的数据支撑。On January 8th,2022,an M_(S)6.9 earthquake occurred around Menyuan County(37.77°N,101.26°E),Qinghai Province.The epicenter is located in the northeastern part of the Tibetan plateau,where the western section of the Lenglongling Fault meets the eastern section of the Tolaishan Fault.In order to know the spatial distribution of coseismic surface rupture zone as soon as possible,and determine the seismogenic structure,the post-earthquake GF-7 remote sensing images of the Menyuan M_(S)6.9 earthquake were analyzed.Moreover,combining the interpretation of the GF-7 images and the field investigation,the distribution of the co-seismic surface rupture was determined and the typical coseismic landforms,and the image recognition features of various co-seismic landforms are interpreted and summarized.The results show that the earthquake produced two major surface rupture zones with a left-stepped oblique spatial arrangement.The main northern branch rupture distributes on the west side of the Lenglongling Fault,with a length of about 22km and a strike of 100°N~120°E,the secondary rupture of the southern branch distributes along the eastern section of the Tuolaishan Fault,with a length of about 4km and a strike of N90°E.The total length of the two rupture zones is about 26km.Along the rupture zones,a series of typical left-lateral strike-slip coseismic landforms were formed,such as tensional fractures,tensional-shear fractures,pressure ridges,pressure bulges,left-lateral strike-slip gullies,as well as left-lateral strike-slip roadbeds,etc.We divided the surface rupture into six segments to conduct detailed observation and analysis,that is,the west of Daohe segment,Liuhuanggou segment,Honggou segment,Yongan River segment and Yikeshugou segment,from west to east among the main rupture zone of the north branch,as well as the secondary rupture zone of the south branch.In general,each co-seismic landform has its distinctive image characteristics,and we obtained them from the interpretation and summarization of the GF-7 images.

关 键 词：2022年门源地震 高分七号 地表破裂特征 冷龙岭断裂 托莱山断裂 

分 类 号：P315.2[天文地球—地震学]