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人们根据地电阻率预报地震的实践,逐渐形成了一条比较合理的研究思路:即孕震过程是地下应力-应变场的演化过程。由于岩石电阻率对应变有灵敏的响应,因此,在孕震过程中地下岩石会产生一定量的电阻率变化。当地表用适当极距的装置探测这种变化时,就有可能探测到作为地震前兆的地电阻率变化讯息。这里有两个基本问题是需要进一步探讨的:1.孕震时,地下不同部位产生应变的量级如何?岩石电阻率变化对应变的“放大”系数有多大?一句话,地下不同深度上电阻率变化的量级如何估计。2.我们通常采用的四极对称装置对不同深度上电阻率变化的探测能力如何?即如何描述地下介质不同深
Based on the prediction of earthquakes by earth resistivity, people gradually formed a rather reasonable research idea: that is, the seismogenic process is the evolution of the underground stress-strain field. Due to the sensitive response of rock resistivity to strain, underground rocks produce a certain amount of resistivity change during the seismogenic process. When the local surface is probed with this device with the proper polar distance, it is possible to detect a change in the earth resistivity as a precursor to the earthquake. Here are two basic questions that need to be explored further: 1. What is the magnitude of strain in different parts of the earth during earthquakes? What is the “amplification” factor for the change in rock resistivity versus strain? In short, the resistance at different depths underground How to rate the rate of change. 2. What is the capability of our quadrupole symmetric devices to detect resistivity changes at different depths, ie, how to describe different depths of underground media