IODP operator and logging contractor: LDEO-BRG
Hole: U1309D-ph2
Expedition: 305
Location: Atlantis Massif - Mid Atlantic Ridge (central N Atlantic)
Latitude: 30° 10.120' N
Longitude: 42° 7.113' W
Logging date: January 31 - February 2, 2005

VSP STACK SUMMARY LISTING (one-way transit times)

Gun and Hydrophone Coordinates:

Gun Azimuth: 0.0 deg
Gun Offset: 55.0 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)          
       -----                -----                -----                -----                -----                -----         

                   11                    1  01-02-2005:04:05:05          2496.000000             0.000000             0.000000
                   10                    2  01-02-2005:04:24:36          2441.000000             0.436428             0.424391
                    9                    3  01-02-2005:04:37:55          2380.999756             1.232539             1.223466
                    8                    4  01-02-2005:04:50:50          2329.999756             1.224891             1.214905
                    7                    5  01-02-2005:05:01:57          2279.999756             1.215887             1.205014
                    6                    6  01-02-2005:05:13:21          2225.000000             1.208146             1.198112
                    5                    7  01-02-2005:05:23:51          2171.000000             1.199397             1.189310
                    4                    8  01-02-2005:05:33:27          2126.000000             1.193109             1.182202
                    3                    9  01-02-2005:05:44:35          2081.000000             1.183628             1.173639
                    2                   10  01-02-2005:06:02:12          2026.000000             1.176615             1.164701
                    1                   11  01-02-2005:06:13:32          1991.999878             1.168857             1.158937
                    0                   12  01-02-2005:06:28:04          1921.999878             1.156913             1.145852