2015年尼泊尔8.1级大地震前后喜马拉雅带地震活动图像演变  

THE EVOLUTION OF SEISMIC ACTIVITY IMAGE IN THE HIMALAYA BELT BEFORE AND AFTER 2015 NEPAL M 8.1 GREAT EARTHQUAKE

作　　者：刘杰[1,2,3] 赵根模[2,4] 吴中海[2,3] LIU Jie ZHAO Gen-mo WU Zhong-hai(Nat ional Administrat ion of Surveying, Mapping And Geoinformat ion, Be i j ing 1 0 0 8 3 0 , China Institute of Geome chanics , Chinese Ac ademy of Geological Sciences , Bei jing 100081 , China Key Laboratory of Neotectonic Movement ＆ Geohazard, Mini st ry of Land and Resources, Beijing 100081 , China Earth quake Administration of Tian jin Municipality , Tian jin 300201 , China)

机构地区：[1]国家测绘地理信息局地图技术审查中心,北京100830 [2]中国地质科学院地质力学研究所,北京100081 [3]国土资源部新构造运动与地质灾害重点实验室,北京100081 [4]天津市地震局,天津300201

出　　处：《地质力学学报》2017年第1期173-181,共9页Journal of Geomechanics

基　　金：中国地质调查局项目(1212011120163;12120114002101);国家自然科学基金项目(41171009);中国地质科学院地质力学研究所基本科研业务费项目(DXLXJK201410)

摘　　要：针对2015年4月25日尼泊尔M8.1地震后喜马拉雅造山带的未来地震危险性问题,通过对喜马拉雅带历史大地震应变能释放和在尼泊尔地震发震前后的区域地震活动图像进行了分析研究。结果发现喜马拉雅带很可能已进入新一轮的地震活跃期。此次尼泊尔大地震不足以将喜马拉雅带中段的地壳应变能全部释放,喜马拉雅带中段的地震活动和藏南裂谷带地震活动具有密切的关联,在喜马拉雅带中段和藏南裂谷带还将有大地震活动。同时研究结果还显示现今在喜马拉雅带的东段存在阿萨姆围空区和不丹围空区,在喜马拉雅的西段出现噶尔围空区,喜马拉雅西段新德里和西藏接壤地区以及喀喇昆仑断裂上噶尔县地区地震危险性很高,喜马拉雅东段林芝山南地区以南的阿萨姆和不丹地区危险性很高,应引起重视。Concerning on the future seismic risk brought by Himalaya orogenic belt after the April 25th , 2015 M8. 1 Nepal earthquake, we analyze the strain energy release of Himalaya belt historical great earthquakes and study the regional seismicity images of both pre and post Nepal earthquake. The results show that Himalaya belt may has entered a new round of seismic active period. Crustal strain energy in the middle section of Himalaya belt didn ’ t release completely in this earthquake, the earthquake activity is closely associated between the middle section of Himalaya belt and South Tibet Rift zone , there will be great earthquakes occurring in these two places. Assam gap zone and Bhutan gap zone exist on the east segment of Himalaya belt, meanwhile, Gar gap zone exists on the west, the border region of New Delhi and Tibet in western Himalaya belt and the Gar county area on the Karakorum fault have high seismic risk , Assam and Bhutan in southern Nyingchi, Shannan in eastern Himalaya belt also have high seismic risk, so these zones should be paid more attention to.

关 键 词：尼泊尔地震 地震应变能释放 地震空段 地震围空区 地震危险性 

分 类 号：P315[天文地球—地震学]