RC2614 Cruise/project information ------------------------------------------------------------------------------------- Cruise Name RC2614 NGDC number 01010260 Platform Conrad Ship Operator LDEO Chief Scientist Stephen D. Lewis Principal Investigators Dennis E. Hayes John Ladd Stephen D.Lewis John B.Diebold All collaborating LDEO Institutions Ministry of Geology, People's Republic of China Beginning date 12/01/85 Ending date 12/30/85 MCS start date 12/18/85 MCS end date 12/25/85 Cruise Report yes - online at LDEO Start Port Hong Kong End Port Singapore Project Name Evolution of Passive Margins: Integrated Geophysical Studies Across the Young Margins of the South China Sea Project Description: From the Cruise Report: Conrad 2614 was the third leg of a 3-leg marine geophysical investigation addressing selected aspects of the tectonic development of the South China Sea and its margins. The program was undertaken in cooperation with marine scientists from the People's Republic of China and comprised Phase 2 of the ongoing cooperative effort between Lamont-Doherty Geological Observatory and the Second Marine Geology Brigade, Guangzhou, People's Republic of China R2614 had three principle objectives: 1) Conduct heat flow measurements along three transects in the South China Sea, 2 of which were coindcident with two-ship ESP transects conducted on previous legs of this project. The third heat flow transect crossed the southwest sun-basin of the South China Sea, coincident with a CDP survey track. 2) Conduct a CDP seismic survey across the southwest sub-basin of the South China Sea. 3) Collect SEABEAM swath bathymetric data along the heatflow/ESP transect and along the southwest sub-basin CDP survey tracks. Funding Organization NSF (LDEO) Award # OCE84-15973 ------------------------------------------------------------------------------------- Nav files in RC2614.cdpnav.tar are in UTIG distribution format. 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 Below is a listing of 1st and last cdps and lat/lon from each CC line cdpnav file in RC2614.cdpnav.tar: RC2614.638.cdpnav 11.715456 114.889896 204 1985 12 18 09 30 07 139 638 rc2614 14.190373 113.089360 13683 1985 12 19 16 42 22 895 638 rc2614 RC2614.639.cdpnav 14.171771 113.066416 204 1985 12 19 17 14 07 377 639 rc2614 13.646568 113.074256 2543 1985 12 19 23 18 12 481 639 rc2614 RC2614.640.cdpnav 13.631946 113.080416 204 1985 12 19 23 31 08 425 640 rc2614 12.156392 113.861392 7602 1985 12 20 19 58 27 964 640 rc2614 RC2614.641.cdpnav 12.133288 113.866880 294 1985 12 20 20 13 40 000 641 rc2614 11.280975 114.113552 4236 1985 12 21 05 24 01 677 641 rc2614 RC2614.642.cdpnav 11.284391 114.092576 280 1985 12 21 05 48 38 363 642 rc2614 13.172072 112.682128 10673 1985 12 22 06 07 50 813 642 rc2614 RC2614.643.cdpnav 13.150610 112.670760 303 1985 12 22 06 38 37 079 643 rc2614 12.691004 112.623712 2395 1985 12 22 11 32 42 060 643 rc2614 RC2614.644.cdpnav 12.685734 112.623488 204 1985 12 22 11 36 07 386 644 rc2614 10.779325 113.841600 10205 1985 12 23 11 32 29 981 644 rc2614 RC2614.645.cdpnav 10.788438 113.813656 266 1985 12 23 11 52 45 069 645 rc2614 12.634663 111.814304 12744 1985 12 24 16 58 44 062 645 rc2614 RC2614.646.cdpnav 12.623650 111.812928 204 1985 12 24 17 33 06 973 646 rc2614 10.305995 112.924432 12159 1985 12 25 22 19 40 756 646 rc2614 ------------------------------------------------------------------------------------- ------------------------------------------------------------------------------------- field data: cdp gathers at LDEO on 9-track tape.. ------------------------------------------------------------------------------------- processing system: LDEO MCS Inhouse processing: all stacks: cdp gathered, nmo and stack cdp spacing 25 meters We were unable to read some of the processed 9-track tapes. The original cdp range for the each line is: 638 155-16683 639 153-2543 640 152-7602 641 155-4236 642 233-10673 643 245-2395 644 151-10204 645 211-12744 646 153-12159 File RC2614.seismic.segy.processed.files.index lists all processed files with header info from the 1st and last trace in each file and cdp gaps > 10. *Shot number is zero or the same as cdp number.. LINE CDP *SHOT NOT_USED DATE TIME REC_DELAY SAMPS SAMP_INT NOT_USED NEXT FILE /archive/seismic/processed/RC2614/RC2614.638.stk.10010_13683 638 10010 0 0 12/19/1985 353/07:59:42.000 0 3066 4000 00/00/ 0 638 13683 0 0 12/19/1985 353/16:43:42.000 0 3066 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2614/RC2614.639.stk.00153_02543 639 153 153 0 12/19/1985 353/17:14:42.000 0 3066 4000 00/00/ 0 639 2543 2543 0 12/19/1985 353/23:19:41.000 0 3066 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2614/RC2614.640.stk.00152_07602 640 152 0 0 12/19/1985 353/23:31:42.000 0 3066 4000 00/00/ 0 640 7602 0 0 12/20/1985 354/19:59:42.000 0 3066 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2614/RC2614.641.stk.00155_04236 641 155 0 0 12/20/1985 354/20:02:02.000 0 3066 4000 00/00/ 0 CDPSP GAP BETWEEN 420 AND 432 641 420 0 0 12/20/1985 354/20:33:21.000 0 3066 4000 00/00/ 0 641 432 0 0 12/20/1985 354/20:41:42.000 0 3066 4000 00/00/ 0 641 4236 0 0 12/21/1985 355/05:25:21.000 0 3066 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2614/RC2614.642.stk.00233_08686 642 233 0 0 12/21/1985 355/05:49:42.000 0 3066 4000 00/00/ 0 642 8686 0 0 12/22/1985 356/01:23:42.000 0 3066 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2614/RC2614.643.stk.00245_02395 643 245 245 0 12/22/1985 356/06:38:22.000 0 3066 4000 00/00/ 0 643 2395 2395 0 12/22/1985 356/11:33:41.000 0 3066 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2614/RC2614.644.stk.00151_04028 644 151 0 0 12/22/1985 356/11:36:22.000 0 3066 4000 00/00/ 0 644 4028 0 0 12/22/1985 356/21:01:01.000 0 3066 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2614/RC2614.645.stk.09999_12744 645 9999 0 0 12/24/1985 358/10:42:22.000 0 3066 4000 00/00/ 0 645 12744 0 0 12/24/1985 358/17:00:02.000 0 3066 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2614/RC2614.646.stk.09654_12159 646 9654 0 0 12/25/1985 359/16:22:21.000 0 3066 4000 00/00/ 0 646 12159 0 0 12/25/1985 359/22:21:02.000 0 3066 4000 00/00/ 0 ------------------------------------------------------------------------------------- *************************************************************************************** RC2614 LINE TYPES: CDP 638-643 Seismic Acquisition Parameters ********************************************************** CONRAD Number of Channels 48 Group Spacing 50 meters Cable length 2400 meters Source to Near Channel 280 meters Antenna to Source 60 meters Near Channel Number 48 Cable Depth Unknown Acquisition System Name DFS IV Source Volume 1864 cu in * Source Pressure 2000 Source Type Bolt 1500 Source Number 4 * Source Depth Unknown Shot Control Time Shot Interval 20 secs Acquisition Sample Interval 4000 microseconds Record Length 12 secs Compass No Active Tail Buoy No Recording Delay No Acquisition System Analog * Source number and volume were not listed in the RC2612-13-14 documentation. 4 guns and a volume of 1864 cu in were used for the 2 previous Conrad cruises.