IODP operator and logging contractor: LDEO-BRG Hole: U1317D Expedition: 307 Location: Porcupine Basin, Challenger Mound (eastern N Atlantic) Latitude: 51° 22.832' N Longitude: 11° 43.092' W Logging date: May 6-7, 2005 VSP STACK SUMMARY LISTING (one-way transit times) Gun and Hydrophone Coordinates: Gun Azimuth: 0.0 deg Gun Offset: 49.0 m Gun Depth (from Schlumberger Zero): 13.3 m Hydrophone Depth (from Schlumberger Zero): 13.3 m Seismic Reference Depth (from Schlumberger Zero): 11.3 m Other VSP constants: Surface Velocity: 1524 m/s Acquisition Break Time: Time between start of recording and first break 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. The difference between Acquisition Break Time and Acquisition Transit Time is not constant and varies for each shot. SHOTSEQUENCE ACQUISITION_ ACQUISITION_ CABLE_LENGTH ACQUISITION_ ACQUISITION_ _NUMBER SHOT_NUMBER SHOT_TIME (m) BREAK_TIME TRANSIT_ ----- ----- ----- ----- (s) TIME ----- ----- ----- ----- ----- (s) ----- ----- ----- ----- ----- ----- 12 1 06-05-2005:14:36:55 1055.999878 0.671991 0.660292 11 2 06-05-2005:14:42:41 1039.999878 0.665247 0.652903 10 3 06-05-2005:14:49:39 1025.099976 0.657844 0.646150 9 4 06-05-2005:14:54:57 1009.999939 0.650827 0.638495 8 5 06-05-2005:15:00:03 995.099915 0.642701 0.630979 7 6 06-05-2005:15:05:26 980.099976 0.635875 0.623515 6 7 06-05-2005:15:11:05 964.999939 0.627262 0.615590 5 8 06-05-2005:15:15:48 954.999939 0.623121 0.610680 4 9 06-05-2005:15:21:03 944.999939 0.616746 0.605042 3 10 06-05-2005:15:26:58 935.000000 0.612241 0.599896 2 11 06-05-2005:15:31:39 925.000000 0.606501 0.594105 1 12 06-05-2005:15:36:12 914.999939 0.600785 0.589072 0 13 06-05-2005:15:42:55 904.999939 0.595815 0.583427