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P078 Time-Lapse Interpretation Using Fracture Shear Phenomena N.R. Barton* (Nick Barton & Associates) SUMMARY If production causes down-dip shearing on conjugate dipping fractures as deduced from rock mechanics modelling and from new slickensiding then temporal changes to the pseudo-static compliances changes to hydraulic apertures due to dilation and temporal rotation of shear wave polarization and magnitude and of seismic Q must each be expected. EAGE 69 th Conference & Exhibition — London UK 11 - 14 June 2007 If production causes down-dip shearing on conjugate dipping fractures as deduced a long time ago from rock mechanics modelling and from new