Vertical Seismic Imager Data

Operator and logging contractor: LDEO-BRG
Hole: 19B (proposed site MNGH Gap)
Expedition: NGHP-1
Location: Manahadi Basin, Eastern India (Bay of Bengal)
Latitude: 18° 58.6532' N
Longitude: 85° 39.5160' E
Logging date: August 8, 2006
Sea floor depth (drillers¹): 1433 mbrf 
Sea floor depth (loggers¹): 1436 mbrf 
Total penetration: 1713 mbrf (280 mbsf )
Total core recovered: 271.28 m (90.4 % of cored section, from Hole NGHP-19A)
Oldest sediment cored: n/a
Lithologies: Nanofossil-rich clay (from Hole NGHP-19A)
VSP SHOT SUMMARY LISTING (one-way transit times)

Gun and Hydrophone Coordinates:

Gun Azimuth: 0.0 deg
Gun Offset:  49 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_         STACK_NUMBER         ACQUISITION_         CABLE_LENGTH           TIME_OF_           ACQUISITION_         TRANSIT_TIME     
      _NUMBER            SHOT_NUMBER             -----              SHOT_TIME               (m)               FIRST_DATA           BREAK_TIME              (s)          
       -----                -----                -----                -----                -----                 (s)                  (s)                 -----         
       -----                -----                -----                -----                -----                -----                -----                -----         

                    5                    1                    1  08-08-2006:03:19:35          1696.123291             0.245000             1.117401             1.117401
                    4                    2                    2  08-08-2006:03:28:57          1686.069946             0.245000             1.111363             1.111363
                    3                    4                    4  08-08-2006:03:55:55          1671.045898             0.245000             1.101594             1.101594
                    2                    6                    6  08-08-2006:04:12:59          1661.099243             0.245000             1.092892             1.092892
                    1                    7                    7  08-08-2006:04:29:48          1656.120850             0.245000             1.092284             1.092284
                    0                    8                    8  08-08-2006:04:38:01          1646.085327             0.245000             1.083732             1.083732