IODP operator and logging contractor: LDEO-BRG
Hole: U1301B
Expedition: 301
Location: Juan de Fuca Ridge (NE Pacific)
Latitude: 47° 45.229' N
Longitude: 127° 45.826' W
Logging date: August 2004

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.


    SHOT_SEQUENCE         ACQUISITION_         ACQUISITION_         CABLE_LENGTH         ACQUISITION_         ACQUISITION_     
      _NUMBER            SHOT_NUMBER           SHOT_TIME               (m)               BREAK_TIME            TRANSIT_       
       -----                -----                -----                -----                 (s)                  TIME         
       -----                -----                -----                -----                -----                 (s)          
       -----                -----                -----                -----                -----                -----         

                    4                    1  02-08-2004:07:12:07          3049.999023             1.979014             1.969405
                    3                    2  02-08-2004:07:19:00          3031.698242             1.973812             1.965265
                    0                    3  02-08-2004:07:27:24          3026.597900             1.974045             1.964499
                    5                    1  02-08-2004:07:12:07          3049.999023             1.979014             1.969405
                    2                    2  02-08-2004:07:19:00          3031.698242             1.973812             1.965265
                    1                    3  02-08-2004:07:27:24          3026.597900             1.974045             1.964499