There are many kinds of fault happening during the test and the occurrence of faults is highly random. All these bring great difficulties to test personnel.
试验过程中故障种类多，而且故障的发生具有很大的随机性，这些都给试验人员带来极大困难。
These instruments measure tilts int the ground's surface, as well as changes in the magnetic field near active faults . Usually these changes precede the occurrence of some earthquakes.
他们还用各种各样的仪器和方法，通过测量地震前发生的地球物理上的变化，如地表倾斜度和 活性断层附近的磁场变化，对地震进行预测。
The occurrence of strong earthquakes is directly controlled by the activities of both deeply penetrating faults…
超壳断裂和玄武质岩层断裂组合的活动，直接控制强震的发生。
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