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.
出处
《大地测量与地球动力学》
CSCD
北大核心
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)
关键词
汶川地震
地倾斜
特征迁移
触发
诱发
Wenchuan earthquake
ground incline
migration character
triggering
induce
