长江三峡工程周边地区的采矿诱发地震
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摘要
地震观测和实地调查表明，长江三峡工程周缘广泛存在采矿诱发地震。采矿诱发地震主要是由于矿山采空区的出现使浅部地壳差应力增大岩体失稳而产生的，它们不同于天然地震。水库蓄水前应对这些地震的背景进行详细研究。在进行区域地震震情分析和预报、区域应力场及活动断裂研究时应严格加以区别。
The results of observation by intensified seismic network and field investigation indicate that mining induced earthquakes are widely distributed around the Yangtze Gorge Project. To monitor and predict the reservoir induced earthquakes after filling in the future the seismic background should be made clear in the reservoir area before impoundment. Results of investigation show that mining induced earthqaukes are caused by the presence of underground mined out area which makes the stress difference increased and the rock mass failed. These events are quite different from the natural earthquakes. Seismologists and geologists should be careful to distinguish these two types of seismicity in analysing the regional seismic regime and predicting earthquakes as well as in studying the tectonic stress field and active faults.
The results of observation by intensified seismic network and field investigation indicate that mining induced earthquakes are widely distributed around the Yangtze Gorge Project. To monitor and predict the reservoir induced earthquakes after filling in the future the seismic background should be made clear in the reservoir area before impoundment. Results of investigation show that mining induced earthqaukes are caused by the presence of underground mined out area which makes the stress difference increased and the rock mass failed. These events are quite different from the natural earthquakes. Seismologists and geologists should be careful to distinguish these two types of seismicity in analysing the regional seismic regime and predicting earthquakes as well as in studying the tectonic stress field and active faults.
引文
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