IODP operator and logging contractor: LDEO-BRG
Hole: U1324A
Expedition: 308
Location: Ursa Basin (Gulf of Mexico)
Latitude: 28° 4.786'N
Longitude: 89° 8.357'W
Logging date: June 19-20, 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): 12.6 m
Hydrophone Depth (from Schlumberger Zero): 12.6 m
Seismic Reference Depth (from Schlumberger Zero): 10.6 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)          
       -----                -----                -----                -----                -----                -----         

                   15                    1  20-06-2005:05:54:33          1564.999878             1.015581             1.003871
                   14                    2  20-06-2005:06:03:06          1544.899902             1.005597             0.993026
                   13                    3  20-06-2005:06:15:37          1520.000000             0.992005             0.979447
                   12                    4  20-06-2005:06:25:16          1495.000000             0.978312             0.965777
                   11                    5  20-06-2005:06:32:52          1449.900024             0.952500             0.940779
                   10                    6  20-06-2005:06:40:12          1425.099854             0.939379             0.926841
                    9                    7  20-06-2005:06:46:25          1400.000000             0.924547             0.911986
                    8                    8  20-06-2005:06:53:42          1375.099854             0.910000             0.897421
                    7                    9  20-06-2005:07:02:04          1350.000000             0.895303             0.882694
                    6                   10  20-06-2005:07:06:45          1325.000000             0.880063             0.867512
                    5                   11  20-06-2005:07:11:01          1300.000000             0.863576             0.851865
                    4                   12  20-06-2005:07:15:07          1275.499878             0.849531             0.836958
                    3                   13  20-06-2005:07:20:13          1250.000000             0.834385             0.821877
                    2                   14  20-06-2005:07:26:55          1220.000000             0.815481             0.803760
                    1                   15  20-06-2005:07:30:50          1176.999878             0.789540             0.776949
                    0                   16  20-06-2005:07:36:49          1149.900024             0.772435             0.759843