汶川8.0级地震前后陕西地区地倾斜特征迁移分析  

ANALYSIS OF MIGRATION CHARACTERISTICS OF TILT INCLINE IN SHAANXI AREA BEFORE AND AFTER WENCHUAN Ms8.0 EARTHQUAKE

作　　者：张创军[1] 牛安福[2] 

机构地区：[1]陕西省地震局乾陵地震台,咸阳713300 [2]中国地震台网中心,北京100045

出　　处：《大地测量与地球动力学》2009年第B08期11-14,共4页Journal of Geodesy and Geodynamics

基　　金：国家科技支撑计划(2006BAC01B02-02-01);地震科学联合基金(A07147)

摘　　要：对汶川8.0级地震前后陕西地区地倾斜观测资料的分析发现,汶川地震前陕西地区地倾斜存在沿龙门山断裂带方向由东北向西南震中迁移,震后地倾斜反向迁移,迁移平均速度为3～4 km/天。进一步分析认为,震前陕西地区地倾斜向震源迁移可能对汶川8.0级地震起到了触发作用,而震后地倾斜向远场迁移有可能是诱发陕甘川交界的中强余震的主因。Through the analysis of the ground incline observations in Shanxi area before and after WenchuanMs8.0 earthquake, it is discovered that the ground incline migrated along the Longmenshan fault zone direction from northeast to southwest epicenter in Shanxi area before the Wenchuan earthquake, but after the earthquake the migration changed in the opposite direction and the average migration velocity is 3 -4 kilometers/day approximately. By further analysis, it is believed that before the earthquake the migration of ground incline in Shanxi area to the center of Wenchuan Ms8.0 earthquake possibly plays the trigger action, but after the earthquake, the migration of ground incline to the distant field may be the main cause to induce a series strong aftershocks in the border of Shanxi, Gansu and Sichuan province.

关 键 词：汶川地震 地倾斜 特征迁移 触发 诱发 

分 类 号：P315.725[天文地球—地震学]