ODP logging contractor: LDEO-BRG Well name: 820B Leg: 133 Location: Central Great Barrier Reef (tropical SW Pacific) Latitude: 16° 38.219' S Longitude: 146° 18.218' E Logging date: September, 1990 Bottom felt: 290.3 mbrf (used for depth shift to sea floor) Total penetration: 400 mbsf Total core recovered: 324.9 m (81.2 %) VSP TOOL USED: WST (Well Seismic Tool) Acquisition Transit Time: Time between shot firing (as recorded by blast phone) and first break. The shot is fired ~12 milliseconds after start of recording. VSP STACK SUMMARY LISTING (one-way transit times) DEPTH ACQUISITION_TRANSIT_TIME (mmsf) (ms) 334.54 354.54382 313.204 346.25024 285.772 331.64532 264.436 323.18976 249.196 318.5 227.86 305.94635 212.62 300.43384 200.428 292.09998 182.14 282.95459 166.9 278.19513 136.42 259.98016 112.036 245.87109 93.748 238.43143