【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。更多还原

【Abstract】 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.更多还原