Figure 15: The seismic velocities from VSP's, the chlorinity, and the CaCO3
content are compared with the vertical-incidence seismic reflection data from
(A) Site 1994, (B) Site 995 and (C) Site 97. Anomalous chlorinity values indicate
that methane hydrate is present between 220 and 450mbsf at all three sites.
Seismic reflections correlate with vertical lithological changes in the upper
150mbsf and with low seismic velocities indicative of free gas (bright spots)
beneath the hydrate stability zone. The low reflectance above the BSR is the
expected response of lithologically uniform sediments.
[Holbrook et al., 1996]
Retun to the 2003 Fall AGU Poster
THIRD PARTY BOREHOLE SEISMIC EXPERIMENTS DURING THE OCEAN DRILLING PROGRAM
Created on December 10, 2003 by Tom Bolmer