P211 Low Frequency Modifications of Seismic Background Noise Due to Interaction with Oscillating Fluids in Porous Rocks M. Frehner* (Geological Institute ETH Zurich) S.M. Schmalholz (Geological Institute ETH Zurich) Y. Podladchikov (PGP University of Oslo) & R. Holzner (Spectraseis Technologie AG Zurich) SUMMARY Low frequency spectral modifications of seismic background waves (noise) due to interaction with partially saturated porous rocks are investigated. Non-wetting fluid drops entrapped in pores can oscillate with a characteristic eigenfrequency. A 1D wave equation is coupled with a linear oscillator equation representing these oscillations. The resulting system of equations is solved numerically with explicit finite differences.


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