安徽嘉山台的多极距电阻率观测

利用1990年以来安徽嘉山台的多极距电阻率观测资料进行反演分析，结果显示： 嘉山台的浅层(第一层)电阻率变化幅度最大，认为是受气象和灌溉等因素的干扰； 第二层变化幅度迅速减小； 第三层变化平稳； 深层(第四层)电阻率变化幅度比二、 三层大，可能与层厚为∝有关，原因尚须进一步研究。

Multiple polar distance resistivity observation at Jiashan,Anhui Seismic Station

An inversion analysis is made using the multiple polar distance resist ivity observation data of Jiashan，Anhui Seismic Station since 1990. The result s show that the amplitude of the resistivity variations is the largest in the sha llow layer(the first layer) under Jiashan Seismic Station. The rather large inf l uences of meteorological，irrigation etc. factors are considered to be the reas o ns for this.The variation amplitude decreases rapidly in the second layer.Th e variations in the third layer are quite steady. The amplitude of the resistivit y variations in the deep layer(the fourth layer) is larger than that in the secon d and third layers. The reason is to be studied further，but is presumably related to the ∞ layer thickness.