Cruise/project information ------------------------------------------------------------------------------------- Cruise Name V3608 NGDC number 01030239 Platform Vema Ship Operator LDEO Chief Scientists Manik Talwani Robert Leyden Principal Investigators All collaborating Institutions LDEO Beginning date 02/09/80 Ending date 03/05/80 MCS start date 02/21/80 MCS end date 03/04/80 Cruise Report Yes, paper Start Port Hong Kong End Port Hong Kong Project Name Area South China Sea Funding organization ? Award # 439-5097-5973 Abstract Description V-3608 was the third leg of Phase I in the cooperative program with the Peoples' Republic of China.Approximately 700 nautical miles os single channel and 375 miles of 3-channel data were digitally recorded. A total of 58 sonobuoys were recorded. Continuous topography, magnetics and gravity were collected along the track. Note: Althought the description above from the cruise report says that V3608 was the third leg I believe it was the second leg and V3614 was the third leg. ------------------------------------------------------------------------------------- navigation type Navy Transit Satellite fixes plus dead reckoning cdp navigation files in V3608.cdpnav.tar: Note: Nav files are in UTIG distribution format. Below is a listing of 1st and last cdps and lat/lon from each line cdpnav file in V3608.cdpnav.tar: Position_Correlation_Method: Position is at center of cmp bin and time is the time the ships's antenna was over that position. Trace_Position: trace Source_CMP_offsets_Applied: yes Latitude, Longitude, CMP, Year, Month, Day, Hour, Min, Sec, Msec, Linename, Cruisename V3608.15.cdpnav 21.691109 113.344901 14 1980 02 21 02 53 42 000 15 v3608 17.493002 114.919639 10962 1980 02 23 17 06 30 000 15 v3608 V3608.17.cdpnav 17.776403 115.873875 14 1980 02 24 05 42 23 000 17 v3608 21.814935 114.537497 9522 1980 02 26 06 47 02 000 17 v3608 V3608.18.cdpnav 21.815213 114.552585 14 1980 02 26 07 30 57 000 18 v3608 22.185656 115.630806 2216 1980 02 26 18 40 38 000 18 v3608 V3608.19.cdpnav 22.186727 115.626357 14 1980 02 26 19 14 55 000 19 v3608 20.865703 115.852499 3317 1980 02 27 11 46 11 000 19 v3608 V3608.20.cdpnav 21.048141 115.757056 14 1980 02 27 14 56 39 000 20 v3608 18.119801 116.999627 7094 1980 02 29 04 45 44 000 20 v3608 V3608.21.cdpnav 18.121147 116.982582 14 1980 02 29 05 20 20 000 21 v3608 18.506459 117.898513 2423 1980 02 29 18 37 02 000 21 v3608 V3608.22.cdpnav 18.534498 117.889060 14 1980 02 29 19 32 51 000 22 v3608 20.000148 117.286603 4003 1980 03 01 16 40 52 000 22 v3608 V3608.23.cdpnav 19.971554 117.209072 14 1980 03 01 17 50 13 000 23 v3608 19.959077 114.451915 5616 1980 03 03 00 25 57 000 23 v3608 V3608.24.cdpnav 19.941088 114.477948 14 1980 03 03 01 17 18 000 24 v3608 22.211325 116.086612 5779 1980 03 04 09 55 45 000 24 v3608 Field data cdp gathers on tape at LDEO Processed data files: Below is a list of SEG-Y stack files including header info from first and last traces each file. Fields are as follows: LINE CDP SHOT DATE TIME REC_DELAY SAMPLES SAMP_INT ------------------------------------------------------------------------------------- NEXT FILE /archive/seismic/processed/V3608/V3608.15.stk.12_10962 15 12 12 0 02/21/1980 052/02:53:42.000 0 2560 4000 00/00/ 0 CDPSP GAP BETWEEN 2093 AND 2239 15 2093 2093 0 02/21/1980 052/15:08:57.000 0 2560 4000 00/00/ 0 15 2239 2239 0 02/21/1980 052/16:02:23.000 0 2560 4000 00/00/ 0 CDPSP GAP BETWEEN 2466 AND 2479 15 2466 2466 0 02/21/1980 052/17:23:26.000 0 3070 4000 00/00/ 0 15 2479 2479 0 02/21/1980 052/17:23:47.000 0 3070 4000 00/00/ 0 CDPSP GAP BETWEEN 4081 AND 4703 15 4081 4081 0 02/22/1980 053/03:27:46.000 0 3070 4000 00/00/ 0 15 4703 4703 0 02/22/1980 053/03:28:30.000 0 3070 4000 00/00/ 0 CDPSP GAP BETWEEN 5862 AND 5983 15 5862 5862 0 02/22/1980 053/13:33:59.000 0 2560 4000 00/00/ 0 15 5983 5983 0 02/22/1980 053/14:13:06.000 0 3070 4000 00/00/ 0 CDPSP GAP BETWEEN 8132 AND 8153 15 8132 8132 0 02/23/1980 054/01:27:37.000 3500 3070 4000 00/00/ 0 15 8153 8153 0 02/23/1980 054/01:27:58.000 3500 3070 4000 00/00/ 0 15 10962 10962 0 02/23/1980 054/17:07:17.000 4000 2560 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/V3608/V3608.17.stk.12_9522 17 12 12 0 02/24/1980 055/05:42:23.000 4000 2560 4000 00/00/ 0 CDPSP GAP BETWEEN 333 AND 458 17 333 333 0 02/24/1980 055/07:23:24.000 4000 2560 4000 00/00/ 0 17 458 458 0 02/24/1980 055/08:02:47.000 4000 2560 4000 00/00/ 0 CDPSP GAP BETWEEN 1935 AND 2435 17 1935 1935 0 02/24/1980 055/16:03:44.000 4000 3070 4000 00/00/ 0 17 2435 2435 0 02/24/1980 055/16:04:01.000 4000 3070 4000 00/00/ 0 CDPSP GAP BETWEEN 3703 AND 3812 17 3703 3703 0 02/25/1980 056/01:18:20.000 2500 3070 4000 00/00/ 0 17 3812 3812 0 02/25/1980 056/01:19:20.000 2500 3070 4000 00/00/ 0 17 9522 9522 0 02/26/1980 057/06:47:57.000 0 2560 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/V3608/V3608.18.stk.14_2216 18 14 14 0 02/26/1980 057/07:31:25.000 0 2560 4000 00/00/ 0 CDPSP GAP BETWEEN 1522 AND 1632 18 1522 1522 0 02/26/1980 057/15:18:53.000 0 2560 4000 00/00/ 0 18 1632 1632 0 02/26/1980 057/15:19:46.000 0 3070 4000 00/00/ 0 18 2216 2216 0 02/26/1980 057/18:41:14.000 0 2560 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/V3608/V3608.19.stk.13_3317 19 13 13 0 02/26/1980 057/19:15:12.000 0 2560 4000 00/00/ 0 CDPSP GAP BETWEEN 351 AND 393 19 351 351 0 02/26/1980 057/20:53:22.000 0 3070 4000 00/00/ 0 19 393 393 0 02/26/1980 057/20:53:39.000 0 3070 4000 00/00/ 0 CDPSP GAP BETWEEN 2861 AND 3126 19 2861 2861 0 02/27/1980 058/09:35:26.000 0 3070 4000 00/00/ 0 19 3126 3126 0 02/27/1980 058/09:35:42.000 0 3070 4000 00/00/ 0 19 3317 3317 0 02/27/1980 058/11:46:50.000 0 2560 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/V3608/V3608.20.stk.12_7094 20 12 12 0 02/27/1980 058/14:56:39.000 0 2560 4000 00/00/ 0 20 7094 7094 0 03/01/1980 061/04:46:19.000 4000 2560 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/V3608/V3608.21.stk.14_2423 21 14 14 0 03/01/1980 061/05:21:00.000 4000 2560 4000 00/00/ 0 21 2423 2423 0 03/01/1980 061/18:37:38.000 4000 2560 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/V3608/V3608.21.stk.14_2423.pdecon 21 14 14 0 03/01/1980 061/05:21:00.000 4000 2560 4000 00/00/ 0 21 2423 2423 0 03/01/1980 061/18:37:38.000 4000 2560 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/V3608/V3608.22.stk.12_4003 22 12 12 0 03/01/1980 061/19:32:51.000 4000 2560 4000 00/00/ 0 CDPSP GAP BETWEEN 355 AND 954 22 355 355 0 03/01/1980 061/21:12:24.000 4000 3070 4000 00/00/ 0 22 954 954 0 03/01/1980 061/21:12:41.000 4000 3070 4000 00/00/ 0 CDPSP GAP BETWEEN 1074 AND 1303 22 1074 1074 0 03/01/1980 061/01:05:20.000 4000 3070 4000 00/00/ 0 22 1303 1303 0 03/01/1980 061/01:05:39.000 4000 3070 4000 00/00/ 0 22 4003 4003 0 03/01/1980 061/16:41:29.000 1500 2560 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/V3608/V3608.23.stk.12_5616 23 12 12 0 03/01/1980 061/17:50:13.000 1500 2560 4000 00/00/ 0 CDPSP GAP BETWEEN 2209 AND 2380 23 2209 2209 0 03/02/1980 062/05:02:10.000 0 3070 4000 00/00/ 0 23 2380 2380 0 03/02/1980 062/05:02:28.000 0 3070 4000 00/00/ 0 23 5616 5616 0 03/03/1980 063/00:26:43.000 0 2560 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/V3608/V3608.24.stk.12_5779 24 12 12 0 03/03/1980 063/01:17:18.000 0 2560 4000 00/00/ 0 CDPSP GAP BETWEEN 1245 AND 1338 24 1245 1245 0 03/03/1980 063/08:46:09.000 0 3070 4000 00/00/ 0 24 1338 1338 0 03/03/1980 063/08:46:30.000 0 3070 4000 00/00/ 0 24 5779 5779 0 03/04/1980 064/09:56:20.000 0 2560 4000 00/00/ 0 ------------------------------------------------------------------------------------- cdp spacing 50 meters Each SEG-Y file has a corresponding ASCII history file. processing system LDEO MCS Inhouse General processing history: Burg Decon Band Pass NMO Stack File 21.pdecon: Burg Decon Band Pass Water Velocity Moveout Wiener Filter to remove seafloor multiple Differential moveout Stack All other files: Burg Decon Band Pass NMO Stack COMMENT: The cdp gathers were made assuming a constant 50 meters between shots. The cdp number was assigned the shot number of the far trace in the gather. The time in the stack header was assigned the time of the near trace in the header. Some dates/times in the headers are incorrect. They have been corrected in the cdpnav files. Times are GMT. V3608 Seismic Acquisition Parameters (Geometry and source information based on other Vema MCS cruises.) ********************************************************** Number of Channels 3 (recorded as traces 10, 11, 12) Group Spacing 100 meters Cable length 300 meters Source to Near Channel 127 meters (shown in processing records) Antenna to Source Unknown Antenna to Stern 53 meters Near Channel Number 12 Cable Depth Unknown Acquisition System Name DFS IV Source Volume 932 cu in Source Pressure 2000 Source Type Bolt 1500C Source Number 2 Source Depth Unknown Shot Control Time (adjusted from 17 to 28 seconds for approximately 50 meters) Acquisition Sample Interval 4000 microseconds Record Length 12 seconds Compass No Active Tail Buoy No Recording Delay Yes Acquisition System Analog 2 or more ships No **********************************************************