Figure F17. A. Seismically derived reflection coefficients (RC; from 2000 SCS grid) showing reduced reflectivity in the center of Bullseye vent. Locations of piston cores, live chemosynthetic communities, and conductivity-temperature-depth (CTD) casts are shown. B. Time slice at 1.75 s two-way traveltime through the 2000 SCS grid using the instantaneous amplitude attribute. A ring of high-reflection amplitude surrounds the center of the blank zone (hence the name Bullseye vent). The seismically imaged top of the massive gas hydrate layer is shown on the map as depth contour lines. C. Cross-section of top of massive gas hydrate layer at Bullseye vent. Axes are universal transverse Mercator (UTM) projection easting and northing coordinates using the WGS-84 reference. MCS = multichannel seismic, XL = cross line.
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