Deep fault zones are characterized by mylonitic rocks with strong preferred orientation of constituent minerals and retrograde mineral assemblages. Sonic velocities are consequently lower (for propagation directions normal to mylonite foliation) than in surrounding unmylonitized rocks. Synthetic seismograms computed for low-velocity, near-horizontal, thick mylonite zones of complex, laminated geometry show multicyclic reflections with amplitudes up to twice those generated by a single interface. Seismic characteristics of mylonite zones are sufficient to produce reflections in crystalline rocks, provided noise levels are relatively low.

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