3.Many uncertain factors are involved in seismic performance evaluation and the probabilistic results drawn from inadequate information are suspectable.
5.The spatial variation of seismic ground motions is produced primaryly by the three factors of geometric incoherency effect,wave-passage effect, and local site effect.
6.The drilling results and drill stem test result prove that the prediction results of seismic nonelastic effect completely coincide with the actual gas-bearing Situation in the reservoir.
7.The shift, collision and within plate intraformational gliding of plates may result in the occurrence of earthquakes.Two seismic zones may be recognized in China: eastern and western seismic zones.