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近期天山地震带地震活动固体潮调制的统计分析
李金1) 蒋海昆2) 曲均浩3) 黄瑜4) 高朝军1)
1) 新疆维吾尔自治区地震局,乌鲁木齐 830011;2) 中国地震台网中心,北京 100045;3) 山东省地震局,济南 250014;4) 新疆维吾尔自治区地震局喀什基准台,新疆喀什 844000
摘要:
利用Schuster检验方法,以潮汐体应力为计算量,采用2010年1月1日至2012年8月31日天山中东段MI ≥2.0的地震数据,对天山地震带地震活动受固体潮触发情况从时、空两方面进行统计分析。研究结果显示,Schuster检验P值时间窗平滑结果与天山地震带较强地震的发生对应较好,尤其是2011年11月1日尼勒克6.0级地震之前很长一段时间,Schuster检验P值时间窗平滑结果一直低于潮汐触发地震的阈值0.05,而尼勒克6.0级地震发生后,该值迅速恢复到较高水平,反应了此次地震的发生与固体潮的密切关系;从Schuster检验P值空间窗平滑结果看,尼勒克6.0级地震也处于或接近潮汐调制触发地区。因而,从时、空两方面的检验结果看,尼勒克6.0级地震的发生受固体潮调制明显。
关键词:  天山地震带  尼勒克地震  固体潮触发  Schuster检验
DOI:
分类号:
基金项目:
A Statistical Analysis on Recent Tidal Triggering of the Earthquake in the Tianshan Seismic Zone1
Li Jin1),Jiang Haikun2),Qu Junhao3),Huang Yu4),and Gao Chaojun1)
1) Earthquake Administration of Xinjiang Uygur Autonomous Region,Urumqi 830011,China ; 2) China Earthquake Networks Center,Beijing 100045,China ; 3) Earthquake Administration of Shandong Province,Jinan 250014,China ; 4) Kashi Standard Seismic Station,Earthquake Administration of Xinjiang Uygur Autonomous Region,Kashi 844000,Xinjiang,China
Abstract:
A statistical analysis is done to study the spatio-temporal features of earthquake activity in the Tianshan seismic belt triggered by tide,based on Schusters test. The data we choose is the ML≥2. 0 earthquakes from January 1,2010 to August 31,2012 in eastern Tianshan, and the calculation is on tidal body stress. The results show that the p-value based on the time window smoothing of Schusters test corresponds better with the strong earthquakes in the Tianshan seismic belt,especially for a long time before the November 1,2011 Nilka MS6. 0 earthquake,when the p-value of the Schusters test was always lower than the threshold of 0. 05 for tidal trigger of earthquake,but after the Nilka MS6. 0 earthquake, that value was quickly restored to a high level,which reflects a close relationship between the Nilka MS6. 0 earthquake and the Earth tide. According to the p-value based on the spatial window smoothing of Schusters test,the Nilka MS6. 0 earthquake was at or near the tidal triggering area. Thus we can see from the spatio-temporal results that the Nilka MS6. 0 earthquake was obviously triggered by Earth tide.
Key words:  Tianshan seismic zone  Nilka earthquake  Tidal triggering  Schusters test