The study of recent fault activity in bedrock area, where no young sediments can be observed, is often fulfilled through the study of fault zone materials.
在缺乏新沉积层的基岩区研究断层新活动的时代，往往通过测定断层物质的年龄来进行。
The remaining portion of the dam adjacent to the damaged area also experienced high accelerations and separated from its foundation bedrock.
与大坝受损位置相邻的其他部分也同样受到高加速冲击，脱离了地基的岩体。
But because of hard to fix test ring in bedrock, so report of domestic deep worked-out area overlying rock subsidence observation by layers have not yet been heard so far.
研究采空区剩余沉降对上覆建（构）筑物造成的危害程度，分层沉降观测是比较直观的方法，但由于基岩内测试环固定困难，在大深度采空区上覆岩层中进行分层沉降观测国内未见报道。
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