CAJ | 학술논문

从实验上确证：岩石在主破裂前一瞬间，纵波速度升高甚至超过原最大值的两倍以上，纵、横波速比Vp/Vs升高甚至达2.5～3.0，之所以造成这种现象：对前者一个原因是主破裂前有些张裂缝闭合，另一个原因是主破裂前微破裂急剧增多，在某一时刻同时发生几个小破裂，各检波器所记讯息可能不是同一事件。对后者，P、S波的走时在破裂孕育过程中的下降--回升(相对变化量)并不同步而是P波的变化先于或大于S波也是重要原因。
종실험상학증：암석재주파렬전일순간，종파속도승고심지초과원최대치적량배이상，종、횡파속비Vp/Vs승고심지체2.5～3.0，지소이조성저충현상：대전자일개원인시주파렬전유사장렬봉폐합，령일개원인시주파렬전미파렬급극증다，재모일시각동시발생궤개소파렬，각검파기소기신식가능불시동일사건。대후자，P、S파적주시재파렬잉육과정중적하강--회승(상대변화량)병불동보이시P파적변화선우혹대우S파야시중요원인。
The results of the experiment prove that the P wave velocityincreases to the value more than two times of the previous maximum just before the main - rupture. The velocity ration (Vp/Vs) also increases to 2.5 - 3.0. For the velocity variation the reason is that the tensile cracks closed and a lot of micro - cracks emerged at the same time before the rock destroyed. At this moment, the different sensor maybe recorded the signal of different crack produced. For the ratio, the decrease and increase of the travel time of P and S wave in preparing process of fracture was not synchronized. In fact, the travel time variation of P wave was earlier or larger than that of S wave.