What seismic response should we expect when it is rather the seismic rock that rests on a soft sediment, as in the case of overlapping faults?

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Sumit Verma

This question is not clear. You mean hard rock ( high density, and high velocity) on top of a soft rock ( low density, and low velocity)? Hard rock (e.g. igneous rock) will have higher impedance than soft rock (say sandstone), and seismic wave will be reflected with a rarefaction (trough) or negative amplitude.

Laura Del Valle Villalonga

Dear collegue,

For more information of this topic you have some papers, for example:

Fátima Rossetti, D. (1999). Soft-sediment deformation structures in late Albian to Cenomanian deposits, Sao Luís Basin, northern Brazil: evidence for palaeoseismicity. Sedimentology 46, 1065-1081 or Koç Tasgin et al., 2011. Soft-sediment deformation structures in the late Miocene Selmo Formation around Adiyaman area, Southeastern Turkey. Sedimanetary Geology 235, 277- 291. I hope i've been helpful.