青藏块体东北缘断层形变综合指标异常与岷县漳县6.6级等强震关系
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摘要
采用截至2013年底青藏块体东北缘的跨断层短水准流动观测资料,基于灰色关联度计算,提炼了祁连山—海原—六盘山、西秦岭主要构造断裂及分段的正逆断垂向活动综合指标,对强震尤其是2013年甘肃岷县漳县6.6级震前中短期异常,及与周边大震孕育—发生或影响的可能关系进行了研究。结果表明:(1)6级左右地震前相关构造及其附近中短期异常明显;综合指标对与周边8级特大地震孕育—发生可能存在一定关联、大尺度区域构造应力场的变化也有一定程度反映。(2)2013年甘肃岷县漳县6.6级震前西秦岭构造北—西部至六盘山断裂综合指标异常显著且集中,发震的西秦岭构造短期变化幅度较大。
Based on computation of grey relation degree,using mobile observation data of cross-fault short-leveling up to the end of 2013,we refine the synthetic norms for normal-thrust vertical activity of main fractures and their segments in Qilian M ountain-Haiyuan-Liupan M ountain and Western Qinling M ountains,and studied the middleshort-term abnormities before the strong earthquakes especially the M inxian-Zhangxian MS6. 6 earthquake in2013,and their possible relationship with preparation,occurrence and influence of strong earthquake in the surrounding area. The results showthat:( 1) There existed obvious medium-short-term abnormities before the earthquake of magnitude about MS6. 0 in the related tectonic region and its nearby. The synthetic norms are related to the preparation and occurrence of MS8. 0 earthquakes,and could reflect the variation of large-scope regional tectonic strain field.( 2) Before the M inxian-Zhangxian MS6. 6 earthquake, the abnormities of synthetic norm were remarkable and concentrated from the north and west of Western Qinling M ountains Faults to Liupan M ountain Fault,and the short-term variation range was relatively obvious at the seismogenic structure of Western Qinling M ountains Fault.
Based on computation of grey relation degree,using mobile observation data of cross-fault short-leveling up to the end of 2013,we refine the synthetic norms for normal-thrust vertical activity of main fractures and their segments in Qilian M ountain-Haiyuan-Liupan M ountain and Western Qinling M ountains,and studied the middleshort-term abnormities before the strong earthquakes especially the M inxian-Zhangxian MS6. 6 earthquake in2013,and their possible relationship with preparation,occurrence and influence of strong earthquake in the surrounding area. The results showthat:( 1) There existed obvious medium-short-term abnormities before the earthquake of magnitude about MS6. 0 in the related tectonic region and its nearby. The synthetic norms are related to the preparation and occurrence of MS8. 0 earthquakes,and could reflect the variation of large-scope regional tectonic strain field.( 2) Before the M inxian-Zhangxian MS6. 6 earthquake, the abnormities of synthetic norm were remarkable and concentrated from the north and west of Western Qinling M ountains Faults to Liupan M ountain Fault,and the short-term variation range was relatively obvious at the seismogenic structure of Western Qinling M ountains Fault.
引文
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陈学忠,李艳娥,王恒信,等.2013.2004年印尼苏门达腊MW9.0地震前地震活动增强现象及其与地球自转的关系[J].地球物理学报,56(1):79-90.
邓起东,张培震,冉勇康,等.2002.中国活动构造基本特征[J].中国科学(D辑),32(12):1020-1030.
江在森,丁平,王双绪,等.2001.中国西部大地形变监测与地震预测[M].北京:地震出版社,44-46,87-105.
彭立国,陆明勇.2004.灰色系统理论在地震预报中的应用[J].大地测量与地球动力学,24(2):120-123.
王双绪,江在森,陈文胜,等.2001.景泰5.9级地震的断层形变异常及中短期预报[J].地震学报,23(2):151-158.
张希,江在森,王双绪,等.2001.我国西部近期应变强度比动态演化特征[J].地震研究,24(2):115-120.
张希,唐红涛,李瑞莎,等.2012.基于灰色关联度的鲜水河断裂活动特性与大震关系研究[J].地震研究,35(4):500-505.
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张希,薛富平,王双绪.2004.大姚、民乐—山丹地震前的中短期前兆[J].大地测量与地球动力学,24(4):57-63.
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