IODP operator and logging contractor: LDEO-BRG
Hole: U1327D
Expedition: 311
Location: Cascadia Margin (NE Pacific)
Latitude: 48° 41.8954' N
Longitude: 126° 51.9059' W
Logging date: October 7-8, 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): 12.3 m
Hydrophone Depth (from Schlumberger Zero): 12.3 m
Seismic Reference Depth (from Schlumberger Zero): 10.3 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)          
       -----                -----                -----                -----                -----                -----         

                   15                    1  08-10-2005:05:54:10          1589.999878             1.059457             1.047813
                   14                    2  08-10-2005:06:01:05          1584.900024             1.057235             1.045549
                   13                    3  08-10-2005:06:08:22          1579.999878             1.053401             1.041788
                   12                    4  08-10-2005:06:18:29          1570.000000             1.044858             1.033376
                   11                    5  08-10-2005:06:23:51          1564.999878             1.041162             1.029563
                   10                    6  08-10-2005:06:38:45          1559.900024             1.041647             1.030005
                    9                    7  08-10-2005:06:53:26          1547.999878             1.033210             1.021592
                    8                    8  08-10-2005:06:58:50          1545.000000             1.031382             1.019791
                    7                    9  08-10-2005:07:05:04          1539.999878             1.029419             1.016970
                    6                   10  08-10-2005:07:13:38          1534.999878             1.025445             1.013867
                    5                   11  08-10-2005:07:18:25          1529.999878             1.023406             1.011043
                    4                   12  08-10-2005:07:28:50          1525.000000             1.022098             1.009666
                    3                   13  08-10-2005:07:40:19          1515.999878             1.015416             1.003919
                    2                   14  08-10-2005:07:58:26          1503.999878             1.009361             0.996904
                    1                   15  08-10-2005:08:09:50          1500.000000             1.008469             0.996082
                    0                   16  08-10-2005:08:16:39          1495.000000             1.003564             0.992071