【摘要】 针对我国地震监测预报中固定地点和固定观测装置及参数的视电阻率观测,给出了半空间倾斜各向异性介质中电阻率对称四极观测的理论探测深度,研究了地震前兆信息的检测深度问题,得到:(1)在强地震、孕震晚期阶段,在震中区及附近可检测到地壳近地表较深部介质的电阻率变化,其深度大于或远大于均匀介质之;(2)震级、震中距、观测方向不同或在不同的孕震阶段,探测深度存在差异,甚至存在大的差异,且是动态变化的.并依据理论探测深度讨论了地震视电阻率前兆变化的复杂性、地电台址电性条件等问题.更多还原

【Abstract】 In consideration of China′s observation of apparent resistivity at fixed sites with fixed electrode arrays for earthquake monitoring and prediction,we produced the theoretical detection depth for the symmetric four-electrode resistivity observation in the half-space of sloping and anisotropic medium,and researched the depth to detect the apparent resistivity precursory related to earthquake,and thus,obtained the following results:(1) In the late preparation period of strong earthquakes,the changes in apparent resistivity in the underground deep place could be recorded in/near the epicentral region,which is far deeper than that in homogeneous medium;(2) The detection depth is different for different magnitudes of earthquake,different epicentral distances and in different measuring directions or in different stages of earthquake preparation,the difference could be very large and varies dynamically.Besides,we discussed the problems of the complexity of precursory changes in apparent resistivity and the ground electrical condition of the station site in observation of apparent resistivity based on the theoretical detection depth.更多还原