Borehole-to-surface wave propagation: modeling with finite elements , by Pierre Samec and Clement Kostov

Finite element computations (two space dimensions, cartesian geometry) are used to illustrate wave prpagation phenomena for models including a fluid-filled borehole and a free-surface. We show that at low frequencies, such that the "diameter" of the borehole is small compared to the wavelength, the borehole significantly influences the far field by conversion of tube waves to Rayleigh and body waves. Our results are relevant to seismic experiments where the source is in a borehole and the receivers are either near the surface or in another borehole.


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