西安台地电阻率变化初探
A PRIMARY STUDY OF GEORESISTIVITY CHANGE AT XI'AN STATION
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摘要: 本文通过对西安台地电阻率变化的初步研究表明:西安台地电阻率变化不是地下水位动态变化及其它干扰所引起,在异常期间又无相应地震发生,故认为是一次无震异常变化;西安台地电阻率的主压应变方向(即主轴方位)与地裂缝走向、小震震源机制解主压应力方向大体一致,并且它们都与该区区域应力场方向基本一致。研究结果还表明,西安台地电阻率变化与该区地裂缝活动、小震频次增高等有关,是该区应力-应变状态变化的反映。Abstract: This work is a primary study of the georesistivity changes at Xi'an station. The results show that the georesistivity change at Xi'an station was not caused by change of underground water level or other disturbances. And no corresponding earthquake occurred during the anomalous period. It was an anomalous change without earthquake. The directions of main compres-sive stress obtained by relative change of georesistivity at Xi'an station coincincide with those obtained by ground fissure and the source mechanism solutions of small earthqukes, and are almost consistent with the direction of the regional stress field within the area. The results also show that the georesistivity change at Xi'an station can be correlated with the activity of ground fissure and the increase in the activity of small earthquakes. It is a reflection of the change in stress-strain of this area.
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[1] 吴富春、张家明、王秀生,西安地电阻率异常的分析,西北地震学报,1983, 5, 3, 24——28,
[2] 赵振才、王辛,西安市南郊地裂缝初探,地震,1981, 4; 40——43.
[3] 姜家兰、赵明,周至小震群活动特征,西北地震学报,1984, 6, 1,93——94.
[4] 钱家栋、陈友发、金安忠,地电阻率法在地震预报中的应用,1985,112——113,地震出版社.
[5] 赵玉林、钱复业、杨体成、刘建毅,地电阻率变化的实验,地震学报,1983, 2, 217——224。[1] 吴富春、张家明、王秀生,西安地电阻率异常的分析,西北地震学报,1983, 5, 3, 24——28,
[2] 赵振才、王辛,西安市南郊地裂缝初探,地震,1981, 4; 40——43.
[3] 姜家兰、赵明,周至小震群活动特征,西北地震学报,1984, 6, 1,93——94.
[4] 钱家栋、陈友发、金安忠,地电阻率法在地震预报中的应用,1985,112——113,地震出版社.
[5] 赵玉林、钱复业、杨体成、刘建毅,地电阻率变化的实验,地震学报,1983, 2, 217——224。
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