RC2612 Cruise/project information ------------------------------------------------------------------------------------- Cruise Name RC2613 NGDC number 01010259 Platform Conrad Ship Operator LDEO Chief Scientist John Diebold Co-Chief Scientist Stephen D. Lewis and Platform OCEAN-4 (HaiYang 4) Ship Operator Second Marine Geology Brigade, People's Republic of China Chief Scientist Unknown Principal Investigators Dennis E. Hayes John Ladd Stephen Lewis John B.Diebold All collaborating LDEO Institutions Ministry of Geology, People's Republic of China Beginning date 11/18/85 Ending date 11/28/85 MCS start date 11/20/85 MCS end date 11/26/85 Cruise Report yes - online at LDEO Start Port Hong Kong End Port Hong Kong 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 2613 was the second of three legs of the 1985 China Margin Project. a marine geophysical investigation of the passive continental margin along the northern side of the South China Sea between Taiwan and Hai-Nan Tao. Leg 2613 was the second leg of two-ship ESP/CDP seismic data acquisition. The first leg acquired two-ship seismic data along a transect across the margin at roughly 117.5 deg E. This leg acquired two-ship data along a similar transect across the margin at about 113 deg E. The cooperating ship during both legs was the OCEAN-4, from the second Marine Geology Brigade, People's Republic of China, based in Guangzhou (Canton). Funding Organization NSF (LDEO) Award # OCE84-15973 Funding organization Presumeably PRC for the OCEAN-4. Award # ? ------------------------------------------------------------------------------------- Nav files are in UTIG distribution format. For CC stacks: 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 RC2613.cdpnav.tar: RC2613.624.cdpnav 20.455582 111.539872 204 1983 11 20 12 25 06 625 624 rc2613 19.508616 112.087032 5006 1983 11 20 23 13 57 298 624 rc2613 RC2613.626.cdpnav 20.288078 112.776072 204 1983 11 21 09 37 06 870 626 rc2613 19.620812 113.179832 3624 1983 11 21 16 47 25 126 626 rc2613 RC2613.628.cdpnav 19.119866 112.251552 204 1983 11 22 03 04 07 056 628 rc2613 18.817986 112.378896 1650 1983 11 22 06 34 35 026 628 rc2613 RC2613.630.cdpnav 19.216376 113.318968 204 1983 11 22 16 45 06 962 630 rc2613 18.969112 113.482544 1502 1983 11 22 19 53 28 508 630 rc2613 RC2613.632.cdpnav 18.518144 112.592120 204 1983 11 23 05 48 07 553 632 rc2613 18.185504 112.653696 1707 1983 11 23 09 13 38 474 632 rc2613 RC2613.634.cdpnav 18.428580 113.737784 204 1983 11 23 20 21 07 797 634 rc2613 17.966564 113.888128 2787 1983 11 24 02 49 15 605 634 rc2613 RC2613.636.cdpnav 17.500952 113.066496 204 1983 11 24 12 41 07 230 636 rc2613 16.281567 113.177360 5821 1983 11 25 05 55 37 739 636 rc2613 RC2613.637.cdpnav 16.284376 113.202912 204 1983 11 25 06 24 09 856 637 rc2613 17.566376 112.993648 6979 1983 11 26 00 01 53 475 637 rc2613 ------------------------------------------------------------------------------------- For OO stacks: There are no cdpnav files for the OO stacks, We have no navigation from the Ocean 4. The quality of the OO stacks was poor. They were processed because they provided the only cdp data along the ESP lines. CDP gathering was done assuming a constant shot distance of 150 meters. All OO stacks are of the Ocean 4 recording their shots during ESPs with the Conrad recording the ESP. For all ESPs except line 622 the two ships start ~ 100 km apart and sailed toward each other, passed each other as close as was safe and continued on again for another ~100 km. The assumption is that the Ocean 4 track was roughly the inverse of the Conrad track Using this assumption I prepared start and end points for the OO stacks using the Conrad's positions so that you could at least show the OO stacks on a map. I included the positon of the Conrad at the shot where the ships range was the smallest but a line connecting the two end points may be all that is needed for the map. RC2613.623.OO.cdpnav 20.494608 111.536962 211 1985 11 20 11:54:12.605 623 rc2612 (Conrad shot 714, range ~ 99 km) 20.702516 111.968422 1783 1985 11 20 07:25:02.189 623 rc2612 (Conrad shot 445, range ~ 1.2 km) 20.910926 112.390970 3397 1985 11 20 03:03:12.604 623 rc2612 (Conrad shot 183, range ~ 99 km) RC2613.625.OO.cdpnav 20.304652 112.741612 337 1985 11 21 09 09 12 604 625 rc2613 (Conrad shot 1989, range ~ 88 km) 19.876312 112.435383 1741 1985 11 21 04 13 02 145 625 rc2613 (Conrad shot 1693, range ~ 1.0 km) 19.574116 112.171816 3517 1985 11 21 00 19 12 604 625 rc2613 (Conrad shot 1459, range ~ 88 km) RC2613.627.OO.cdpnav 19.155412 112.258834 193 1985 11 22 02 38 12 604 627 rc2613 (Conrad shot 3038, range ~ 103 km) 19.350769 112.692529 1849 1985 11 21 22 06 02 604 627 rc2613 (Conrad shot 2766, range ~ 0.5 km) 19.548025 113.153542 3481 1985 11 21 17 30 12 604 627 rc2613 (Conrad shot 2490, range ~ 103 km) RC2613.629.OO.cdpnav 19.210240 113.275133 193 1985 11 22 16 11 12 604 629 rc2613 (Conrad shot 3851, range ~ 96 km) 19.021461 112.877406 1753 1985 11 22 11 50 01 855 629 rc2613 (Conrad shot 3590, range ~ 0.5 km) 18.844468 112.463667 3319 1985 11 22 07 30 12 604 629 rc2613 (Conrad shot 3330, range ~ 96 km) RC2613.631.OO.cdpnav 18.554144 112.617376 211 1985 11 23 05 16 12 604 631 rc2613 (Conrad shot 4636, range ~ 98 km) 18.730926 113.028406 1801 1985 11 23 00 58 02 604 631 rc2613 (Conrad shot 4378, range ~ 0.4 km) 18.923920 113.471275 3349 1985 11 22 20 33 12 605 631 rc2613 (Conrad shot 4113, range ~ 98 km) RC2613.633.OO.cdpnav 18.446261 113.706687 193 1985 11 23 19 55 12 605 633 rc2613 (Conrad shot 5515, range ~ 99 km) 18.329472 113.261370 1771 1985 11 23 15 23 02 604 633 rc2613 (Conrad shot 5243, range ~ 0.4 km) 18.207564 112.807965 3403 1985 11 23 11 00 12 604 633 rc2613 (Conrad shot 4980, range ~ 99 km) RC2613.635.OO.cdpnav 17.549956 113.087233 961 1985 11 24 12 00 10 605 635 rc2613 (Conrad shot 6480, range ~ 68.6 km) 17.712487 113.381953 2149 1985 11 24 08 24 02 604 635 rc2613 (Conrad shot 6264, range ~ 0.5 km) 17.853554 113.681368 3445 1985 11 24 05 06 07 604 635 rc2613 (Conrad shot 6066, range ~ 68.6 km) ------------------------------------------------------------------------------------- field data: cdp gathers at LDEO on 9-track tape.. ------------------------------------------------------------------------------------- processing system: LDEO MCS Inhouse processing: all stacks: cdp gathered, nmo and stack 'NF' stacks: noise filter, cdp gathered, nmo and stacked The Conrad cdp lines (CC) 626,628,630,632,634,636,637 had a mute applied. cdp spacing 25 meters File RC2613.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 in some cases is zero. The line 624 9-track tape was unreadable. LINE CDP *SHOT NOT_USED DATE TIME REC_DELAY SAMPS SAMP_INT NOT_USED NEXT FILE /archive/seismic/processed/RC2613/RC2613.623.OO.stk.NF.177_3425 623 177 181 0 11/20/1985 324/03:01:02.000 0 3068 4000 00/00/ 0 623 3425 720 0 11/20/1985 324/12:00:12.000 0 3068 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2613/RC2613.623.OO.stk.178_3425 623 178 181 0 11/20/1985 324/03:01:02.000 0 3068 4000 00/00/ 0 623 3425 720 0 11/20/1985 324/12:00:12.000 0 3068 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2613/RC2613.625.OO.stk.185_3515 625 183 1437 0 11/20/1985 324/23:57:12.000 0 3068 4000 00/00/ 0 625 3515 1990 0 11/21/1985 325/09:10:12.000 0 3068 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2613/RC2613.625.OO.stk.NF.183_3515 625 183 1437 0 11/20/1985 324/23:57:12.000 0 3068 4000 00/00/ 0 625 3515 1990 0 11/21/1985 325/09:10:12.000 0 3068 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2613/RC2613.626.CC.stk.153_3624 626 153 0 0 11/21/1985 325/09:37:41.000 0 3068 4000 00/00/ 0 626 3624 0 0 11/21/1985 325/16:48:21.000 0 3068 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2613/RC2613.627.OO.stk.178_3485 627 178 2491 0 11/21/1985 325/17:31:12.000 0 3068 4000 00/00/ 0 627 3485 3040 0 11/22/1985 326/02:40:12.000 0 3068 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2613/RC2613.627.OO.stk.NF.177_2924 627 177 2491 0 11/21/1985 325/17:31:12.000 0 3068 4000 00/00/ 0 627 2924 2947 0 11/22/1985 326/01:07:10.000 0 3068 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2613/RC2613.628.CC.stk.148_1650 628 148 148 0 11/22/1985 326/03:04:01.000 0 3068 4000 00/00/ 0 628 1650 1650 0 11/22/1985 326/06:35:42.000 0 3068 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2613/RC2613.629.OO.stk.183_3425 629 183 3332 0 11/22/1985 326/07:32:12.000 0 3068 4000 00/00/ 0 629 3425 3870 0 11/22/1985 326/16:30:12.000 0 3068 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2613/RC2613.629.OO.stk.NF.183_3425 629 183 3332 0 11/22/1985 326/07:32:12.000 0 3068 4000 00/00/ 0 629 3425 3870 0 11/22/1985 326/16:30:12.000 0 3068 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2613/RC2613.630.CC.stk.148_1502 630 148 148 0 11/22/1985 326/16:45:02.000 0 3068 4000 00/00/ 0 630 1502 1502 0 11/22/1985 326/19:54:42.000 0 3068 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2613/RC2613.631.OO.stk.NF.183_3425 631 183 4112 0 11/22/1985 326/20:32:12.000 0 3068 4000 00/00/ 0 631 3425 4650 0 11/23/1985 327/05:30:12.000 0 3068 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2613/RC2613.631.OO.stk.183_1494 631 183 4112 0 11/22/1985 326/20:32:12.000 0 3068 4000 00/00/ 0 631 1494 4328 0 11/23/1985 327/00:08:01.000 0 3068 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2613/RC2613.632.CC.stk.148_1706 632 148 148 0 11/23/1985 327/05:48:02.000 0 3068 4000 00/00/ 0 632 1706 1706 0 11/23/1985 327/09:14:41.000 0 3068 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2613/RC2613.633.OO.stk.NF.183_3425 633 183 4982 0 11/23/1985 327/11:02:12.000 0 3068 4000 00/00/ 0 633 3425 5520 0 11/23/1985 327/20:00:12.000 0 3068 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2613/RC2613.634.CC.stk.146_2787 634 147 0 0 11/23/1985 327/20:20:42.000 0 3068 4000 00/00/ 0 634 2787 0 0 11/24/1985 328/02:50:42.000 0 3068 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2613/RC2613.635.OO.stk.NF.189_3425 635 189 5941 0 11/24/1985 328/03:01:12.000 0 3000 4000 00/00/ 0 635 3425 6480 0 11/24/1985 328/12:00:10.000 0 3000 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2613/RC2613.636.CC.stk.153_5921 636 153 0 0 11/24/1985 328/12:41:41.000 0 3068 4000 00/00/ 0 636 5821 0 0 11/25/1985 329/05:57:41.000 0 3068 4000 00/00/ 0 NEXT FILE /archive/seismic/processed/RC2613/RC2613.637.CC.stk.150_6979 637 150 0 0 11/25/1985 329/06:24:22.000 0 3068 4000 00/00/ 0 637 6979 0 0 11/26/1985 330/00:03:02.000 0 3068 4000 00/00/ 0 ------------------------------------------------------------------------------------- *************************************************************************************** RC2613 Notes; This was a 2-ship cruise using the Conrad and the People's Republic of Chine ship, HAIWANG 4. We used Ocean 4 as the name of the Chinese ship at LDEO. I assume this was a translation. LINE TYPES: CDP 624,626,628,630,632,634,636,637 ESP 625,627,629,631,633.635 CC: Conrad recorded Conrad shots OO: Ocean 4 recorded Ocean 4 shots. For ESP lines Conrad recorded the ESP shot by Ocean 4 and the Ocean 4 recorded their own shots as a reflection line. All esp line OO stacks have a one min shot interval. All cdp line CC stacks have a 20 sec shot interval. Seismic Acquisition Parameters ********************************************************** CONRAD OCEAN4 Number of Channels 48 16 Group Spacing 50 meters 50 meters Cable length 2400 meters 800 m Source to Near Channel 280 meters 264 Antenna to Source 60 meters 35 m Near Channel Number 48 1 Cable Depth Unknown Unknown Acquisition System Name DFS IV Unknown Source Volume 1864 cu in * Unknown Source Pressure 2000 Unknown Source Type Bolt 1500C Unknown Source Number 4 * Unknown Source Depth Unknown Unknown Shot Control Time time Shot Interval 20 secs (CC lines) 60 seconds (ESPs) Acquisition Sample Interval 4000 microseconds 4000 microseconds Record Length 12 secs (CC lines) 40 secs Conrad recorded ESPs 12 seconds all OO recording of ESP lines Compass No No Active Tail Buoy No No Recording Delay No ** No Acquisition System Analog 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. ** Recording delay may have been used for Conrad recorded ESPs but not for reflection lines.