RC1904 Cruise/project information ------------------------------------------------------------------------------------- Cruise Name RC1904 NGDC number 01010143 Platform Conrad Ship Operator LDEO Chief Scientist M. Talwani C. Windisch Principal Investigator M. Talwani All collaborating LDEO Institutions Beginning date 11/23/75 Ending date 12/21/75 MCS start date 11/25/75 MCS end date 12/12/75 Cruise Report yes - paper Start Port San Juan, P. R. End Port Brooklyn, NY Project Name MCS reflection measurements on the western margin of the N. Atlantic Ocean Project Description Program objective was to acquire ulti-channel seismic reflection data in the central and eastern Caribbean area. Funding organization NSF Award # OCE 75-15865 Abstract NO ------------------------------------------------------------------------------------- navigation type: US Navy Transit Satellite cdp navigation files in RC1904.cdpnav.tar: 08.cdpnav 09.cdpnav 10.cdpnav 11.cdpnav 12.cdpnav 13.cdpnav 14.cdpnav 15.cdpnav RC1904.all.cdpnav RC1904.line.start_end.cdpnav Please note: All times are local - 4 hours behind GMT. 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: 08.cdpnav 15.412644 -067.337843 113 1978 11 25 14 28 27 000 8 rc1904 12.622108 -068.057471 7000 1978 11 27 07 03 29 000 8 rc1904 09.cdpnav 12.593063 -068.045373 28 1975 11 27 07 32 09 000 9 rc1904 12.513424 -067.013440 2845 1975 11 27 23 11 10 000 9 rc1904 10.cdpnav 12.518504 -067.011692 28 1975 11 27 23 14 50 000 10 rc1904 15.826924 -065.543402 7761 1975 11 29 18 12 31 000 10 rc1904 11.cdpnav 16.061743 -065.335454 28 1975 11 29 22 41 12 000 11 rc1904 16.772847 -065.330002 1439 1975 11 30 06 31 32 000 11 rc1904 12.cdpnav 17.374349 -059.933408 28 1975 12 04 22 04 16 000 12 rc1904 12.960615 -060.186732 9862 1975 12 07 04 42 38 000 12 rc1904 13.cdpnav 12.937563 -060.129921 28 1975 12 07 05 34 58 000 13 rc1904 12.818012 -059.644098 1109 1975 12 07 11 35 18 000 13 rc1904 14.cdpnav 13.088244 -059.246775 2192 1975 12 07 17 36 19 000 14 rc1904 14.376770 -057.458947 6893 1975 12 08 19 43 20 000 14 rc1904 15.cdpnav 14.410080 -057.536438 28 1975 12 08 21 03 00 000 15 rc1904 14.742850 -065.926721 17746 1975 12 12 23 29 01 000 15 rc1904 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 field data: cdp gathers at LDEO processed data files: Below is a list of SEG-Y stack files including header info from first and last traces each file. The delays and number of samples may vary within a line. 3072 was put in the binary header for the number of samples for all lines. Fields are as follows: LINE CDP SHOT SOURCE DATE TIME REC_DELAY SAMPLES SAMP_INT POINT ------------------------------------------------------------------------------------- NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/RC1904/08.stk.113_7000 8 113 113 0 11/25/1975 329/14:29:47.000 5500 3052 4000 00/00/ 0 8 7000 7000 0 11/27/1975 331/07:04:49.000 4500 3052 4000 00/00/ 0 NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/RC1904/09.stk.25_2827 9 25 25 0 11/27/1975 331/07:32:29.000 5500 2822 4000 00/00/ 0 9 2827 2827 0 11/27/1975 331/23:06:30.000 5700 2772 4000 00/00/ 0 NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/RC1904/10.stk.26_7761 10 26 26 0 11/27/1975 331/23:15:30.000 5000 2947 4000 00/00/ 0 10 7761 7761 0 11/29/1975 333/18:13:51.000 5500 3052 4000 00/00/ 0 NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/RC1904/11.stk.25_1439 11 25 25 0 11/29/1975 333/22:41:32.000 5500 1920 4000 00/00/ 0 11 1439 1439 0 11/30/1975 334/06:32:52.000 6000 1920 4000 00/00/ 0 NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/RC1904/12.stk.24_9862 12 24 24 0 12/04/1975 338/22:04:36.000 6500 3072 4000 00/00/ 0 12 9862 9862 0 12/07/1975 341/04:44:38.000 3100 2822 4000 00/00/ 0 NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/RC1904/13.stk.31_1109 13 31 31 0 12/07/1975 341/05:37:18.000 2800 2897 4000 00/00/ 0 13 1109 1109 0 12/07/1975 341/11:36:38.000 1000 3072 4000 00/00/ 0 NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/RC1904/14.stk.2192_6893 14 2192 2192 0 12/07/1975 341/17:37:39.000 500 3072 4000 00/00/ 0 14 6893 6893 0 12/08/1975 342/19:44:40.000 6500 3072 4000 00/00/ 0 NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/RC1904/15.stk.3_17746 15 3 3 0 12/08/1975 342/21:03:40.000 6500 3072 4000 00/00/ 0 15 17746 17746 0 12/12/1975 346/23:30:21.000 5000 3072 4000 00/00/ 0 processing system LDEO MCS Inhouse processing: Lines 8-10 Burg Decon, bandpass, water velocity moveout, Weiner filter, differential moveout and stack lines 11-15 normal moveout and stack cdp spacing 50 meters ------------------------------------------------------------------------------------- ********************************************************** RC1904 Seismic Acquisition Parameters ********************************************************** Number of Channels 24 Group Spacing 100 meters Source to Near Channel 300 meters (Not precise but typical for the Conrad at this time) Antenna to Source 40 meters " " " " Near Channel Number 24 Cable Depth UNKNOWN Acquisition System Name DSFIV Source Volume 1864 cu. in. Source Pressure 2000 psi Source Type Bolt 1500C Source Number 4 Source Depth UNKNOWN meters Shot Control Time : (every 20 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 ********************************************************** ********************************************************** **********************************************************