汶川8.0级地震前后陕西地区地倾斜特征迁移分析
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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.
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.
引文
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2 Scholz C H.A physical interpretation of the Haicheng earth-quake prediction[J].Nature,1977,267:121-124.
3笠原庆一著.赵仲和等译.地震力学[M].北京:地震出版社,1984.
4冯德益,等.长周期形变波及其所反映的短期和短临前兆[J].地震学报,1984,6(1):41-57.
5牛安福.长周期形变与地震[J].地震学报,1993.15(增刊):560—564.
6王少江,等.长周期形变波与慢地震[J].地壳形变与地震,1989,9(3):1-9.
7牛安福,等.吉林汪清7.2级深震前东北地区形变场分布特征[J].地震,2004,24(1):76-81.
8赵根模,等.东亚大陆的地震迁移(二)——沿地震带的迁移[J].华南地震,1997,17(1):15-24.
9李正媛,等.川滇强震震源区形变潮汐短临变化特征[J].大地测量与地球动力学,2003,23(2):55-60.
10牛安福,等.倾斜潮汐振幅因子γ值异常的定量化研究[J].地壳形变与地震,1998,18(2):63-67.
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