2022年青海门源6.9级地震发震构造及甘肃灾区震害特征研究  

Study on the seismogenic mechanism of the 2022 Menyuan M_(S)6.9 and the seismic damage characteristics in Gansu Province

作　　者：周栋 张成军 严武建[2] 康林 ZHOU Dong;ZHANG Chengjun;YAN Wujian;KANG Lin(Zhangye Earthquake Monitoring Center Station,Gansu Earthquake Administration,Lanzhou 734000,China;Key Laboratory of Loess Earthquake Engineering,China Earthquake Administration,Lanzhou 730000,China)

机构地区：[1]甘肃省地震局张掖地震监测中心站,张掖734000 [2]中国地震局黄土地震工程重点实验室,甘肃兰州730000

出　　处：《世界地震工程》2023年第1期20-27,共8页World Earthquake Engineering

基　　金：甘肃省地震局地震科技发展基金(2020GZ01);中国地震局地震工程与工程振动重点实验室重点专项(2020EEEVL0304)。

摘　　要：通过对2022年1月8日青海门源6.9级地震的震源机制、发震构造、房屋和重大生命线工程震害、地震地表破裂带等震害调查资料的综合分析,系统介绍了此次地震震源机制、发震构造、地震烈度分布特点、房屋破坏特征及机理、生命线工程破坏特征及地表破裂带特征。研究结果表明:门源6.9级地震震中位置位于冷龙岭断裂带的西段,性质以左旋走滑为主,其与震源机制解得到的结果相一致,均为走滑型破裂类型;地震最大烈度Ⅸ度,烈度Ⅵ度(含)以上面积约23417 km^(2),等震线长轴呈NWW走向,长轴200 km,短轴153 km;整体上房屋破坏较轻,甘肃境内主要属Ⅶ和Ⅵ度区影响范围,极少部分为Ⅷ度区影响范围;此次地震中滑坡灾害和生命线工程震害较少,主要在Ⅸ和Ⅷ度区造成部分路面裂缝,最为严重的则为兰新高铁浩门至军马场区间祁连山一号隧道群线路桥梁严重受损,隧道震害主要集中在断层影响范围内,其中隧道受破坏严重段约350m,占隧道全长的5.33%,受破坏较严重段分别位于严重段大里程侧402m和小里程侧646m范围内,占隧道全长的15.96%,其余段落震害总体轻微;地震造成地表破裂带约22 km,地震造成的地表与冰面张裂隙和挤压鼓包随处可见。Based on the comprehensive analysis of the investigation data of focal mechanism,seismogenic structure,seismic damage of buildings and lifeline engineering,and surface rupture zone of Menyuan M_(s)6.9 earthquake on January 8,2022 in Qinghai Province,The focal mechanism,seismogenic structure,distribution characteristics of seismic intensity,failure characteristics and mechanism of houses,failure characteristics of lifeline project and surface rupture zone of the earthquake were systematically introduced.The results show that the epicenter of menyuan Ms6.9 earthquake is located in the western segment of Lenglongling fault zone,which is mainly characterized by left-lateral strike-slip,which is consistent with the results of focal mechanism solution,and is a strike-slip rupture type.The area above the maximum intensity Ⅸ and intensity Ⅵ is about 23417km^(2).The long axis of the isoseismic line is NWW direction,the long axis was 200km and the short axis was 153km.On the whole,the damage of houses is relatively light,mainly belonging to degree Ⅶ and Ⅵ zone in Gansu province,and a small part of the area of Ⅷ zone.The disaster of earthquake landslide and lifeline engineering is less,mainly in the Ⅸ,Ⅷ degree area caused some road cracks.The most serious damage is the No.1 tunnel bridge of Qilian Mountain between Haomen and Junmachang of Lanzhou-Xinjiang High-speed Railway,the earthquake damage are mainly concentrated within the influence range of the fault.The severely damaged section of the tunnel is about 350 m,accounting for 5.33% of the total length of tunnel;the less seriously damaged section is located within 402 m at the large mileage side and 646 m at the small mileage side,accounting for 15.96% of the total length of tunnel;the earthquake damage in other sections is generally slight.The earthquake caused the surface rupture zone of about 22 kilometers,and caused the surface and ice cracks and extrusion bulge can be seen everywhere.

关 键 词：门源6.9级地震 震源机制 发震构造 房屋破坏 生命线工程破坏 地表破裂带 

分 类 号：P315.941[天文地球—地震学]