theorize that gas relative permeability, being 3 orders of magnitude less than water relative permeability, restricts gas dissipation. Seismic velocities indicate 1–5% free gas in sediments directly below the BSR, possibly a remnant gas from hydrate decomposition ( MacKay et al., 1994). Perhaps during the last glacier period, an older age BSR existed 70 m below current levels, based on three indicators presented by Housen and Musgrave (1996): 1. That is, seismic velocities decrease rapidly beginning 100 m above BSR to the gas-saturated sediments below ( Cragg et al., 1996). A strong BSR at 225 mbsf defines BGHS at Sites 889/890 ( MacKay et al., 1994 Housen and Musgrave, 1996 Kastner et al., 1998).
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