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(also known as a quake, tremor, or temblor) is the result of a sudden release of energy in the Earth's crust that creates seismic waves.

While other quakes ripple towards Tokyo like a rug being flicked, this kind pumps the whole city violently up and down, then side to side.

The magnitude of an earthquake is determined from the logarithm of the amplitude of waves recorded on a seismogram at a certain period.

These appealing characters of this Improved method would make It effective to model seismic wave propagation in complex media.

Compared with earthquake wave and acoustic wave, Ground Penetrating Radar has many advantages in this work, and has been used widely.

The seismic wave did not being affected generally in easy near surface or plains region.

Roof is composed of heterogeneous rock. When roof failure happens, a large amount of energy would release in the form of seismic wave.

Results indicated most of the permanent ground displacements occurred within a few minutes of the arrival of the first seismic waves.

The displacement of interlayer increases at the beginning and then decreases with the increase of frequency .