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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。
Through the preliminary study on the change of resistivity in Xi’an terrestrial station, this paper shows that the change of resistivity of Xi’an terrane is not caused by the dynamic change of groundwater level and other disturbances, and no earthquakes occur during the anomaly, so it is considered as an anomaly change. The direction of the principal compressive strain (ie, the principal axis) of the rate is consistent with the direction of the ground fissure and the direction of the principal compressive stress in the focal mechanism of the small earthquakes, and they are basically consistent with the stress field direction in this area. The results also show that the change of resistivity in Xi’an is related to the activity of earth fissures and the increase of frequency of small earthquakes in this area, which is a reflection of the change of stress-strain state in this area.