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| | Abstract | | To solve the dynamic crack propagation problem in the porous media, we must know the basic properties of the boundary waves, which satisfy the crack boundary conditions. The free surface Rayleigh waves are the most basic ones. We found that that two kinds of the Rayleigh waves exist in the porous media, the one is generated by the first kind of the dilatational wave, high speed and high frequency, and the rotational waves, and the other is generated by the second kind of the dilatational wave, slow speed and low frequency, and the rotational waves. The energy release by the second Rayleilgh wave may be a key factor for causing the huge earthquake energy radiation above the moment magnitude 9. |
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