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.
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.
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.