EW9409 Cruise/project information ------------------------------------------------------------------------------------- Cruise Name EW9409 NGDC number 01210046 Platform EWING Ship Operator LDEO Chief Scientists Susan McGeary John Diebold Principal Investigators Susan McGeary, U. Of Delaware Gerard Bond, LDEO John Diebold, LDEO Nathan Bangs, UT All collaborating LDEO, U. of Delaware, UT Institutions Beginning date 07/06/94 Ending date 08/03/94 MCS start date 07/09/94 MCS end date 08/02/94 Cruise Report NO Start Port Dutch Harbor, Alaska End Port Dutch Harbor, Alaska Project Name Collaborative Research: Pacific to Bering Shelf Deep Seismic Reflection Experiment Funding organization NSF Award # 94-12684 U of Delaware 94-12683 LDEO 94-11541 UT Abstract A deep multichannel seismic reflection survey of the Aleutian arc and the extensive Alaskina continental shelf will delineate and differentiate arc magmatism and terrain accretion. The high-quality images of the deep structure of the crust and uppermost mantle, when combined with the well-mapped onshore geology, should allow the principal investigators to constrain the mechanisms of accretion and magmatism. Purpose of cruise ------------------------------------------------------------------------------------- navigation type: GPS cdp bin size: 12.5 meters cdp navigation files in EW9409.cdpnav.tar: Note: Nav files are in UTIG distribution format. Below is a listing of 1st and last cdps and lat/lon for each line cdpnav file: 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 1232.cdpnav 49.986161 -171.508161 401 1994 07 09 04 54 18 167 1232 ew9409 53.233004 -173.701128 31689 1994 07 11 03 33 50 443 1232 ew9409 1233.cdpnav 53.162873 -173.638406 401 1994 07 11 05 20 51 761 1233 ew9409 52.063287 -172.657052 11554 1994 07 11 20 47 54 790 1233 ew9409 1234.cdpnav 51.975711 -172.690247 401 1994 07 11 22 26 18 972 1234 ew9409 54.978530 -160.595403 71211 1994 07 16 05 31 27 783 1234 ew9409 1235.cdpnav 54.876414 -160.600293 401 1994 07 16 07 04 18 806 1235 ew9409 53.124998 -160.601967 15964 1994 07 17 05 18 08 491 1235 ew9409 1237.cdpnav 52.921474 -163.807911 6016 1994 07 18 18 07 43 *** 1237 ew9409 55.192236 -165.314817 28634 1994 07 20 04 44 40 182 1237 ew9409 1238.cdpnav 55.183794 -165.313773 401 1994 07 20 05 45 25 052 1238 ew9409 56.017345 -163.563461 11807 1994 07 20 21 55 59 283 1238 ew9409 1239.cdpnav 56.001019 -163.598860 401 1994 07 20 23 11 23 014 1239 ew9409 55.529570 -163.067710 5375 1994 07 21 06 00 19 290 1239 ew9409 1240.cdpnav 55.512039 -163.044867 401 1994 07 21 06 15 38 206 1240 ew9409 55.985470 -161.998762 7136 1994 07 21 15 22 38 124 1240 ew9409 1241.cdpnav 56.025583 -161.967941 401 1994 07 21 15 55 20 000 1241 ew9409 58.524984 -162.069684 22612 1994 07 22 23 00 03 909 1241 ew9409 1242.cdpnav 58.557059 -162.045875 401 1994 07 23 00 21 11 618 1242 ew9409 57.187485 -159.107596 19091 1994 07 24 01 52 58 328 1242 ew9409 1243.cdpnav 57.119487 -159.225640 401 1994 07 24 05 02 32 218 1243 ew9409 58.618522 -167.560452 41575 1994 07 26 14 47 45 225 1243 ew9409 1244.cdpnav 58.919114 -169.580598 401 1994 07 27 04 15 46 408 1244 ew9409 56.140128 -173.924107 33172 1994 07 29 01 22 44 430 1244 ew9409 1246.cdpnav 55.516790 -172.513368 401 1994 07 29 14 03 44 594 1246 ew9409 57.429922 -169.155028 23729 1994 07 30 22 52 05 242 1246 ew9409 1247.cdpnav 57.420311 -169.197955 401 1994 07 31 00 08 52 096 1247 ew9409 56.266969 -165.201529 22650 1994 08 01 05 08 12 147 1247 ew9409 1248.cdpnav 56.269734 -165.196575 401 1994 08 01 06 18 13 353 1248 ew9409 54.834938 -168.614884 22081 1994 08 02 11 00 07 790 1248 ew9409 1249.cdpnav 54.848648 -168.661686 401 1994 08 02 11 26 02 332 1249 ew9409 55.702108 -167.993604 9036 1994 08 02 22 21 32 617 1249 ew9409 field data: shot 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. All files are IEEE format except 1232.fk.v2.mutestk.16059_22059 which is IBM floating point. Fields are as follows: LINE CDP SHOT DATE TIME REC_DELAY SAMPLES SAMP_INT NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/EW9409/1232.fk.v2.mutestk.16059_22059 1232 16059 4104 07/10/1994 191/02:54:10.000 0 4250 4000 1232 22059 6055 07/10/1994 191/13:58:14.000 0 4250 4000 NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/EW9409/1232.v2.mutestk.225_31673 1232 225 99 07/09/1994 190/04:54:18.000 0 4000 4000 1232 31673 8497 07/11/1994 192/03:32:24.000 0 4250 4000 NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/EW9409/1233.v0.inmute.stk.225_11538 1233 225 8500 07/11/1994 192/05:20:51.000 0 4250 4000 1233 11538 11281 07/11/1994 192/20:46:35.000 0 4250 4000 NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/EW9409/1234.v1.iomute.stk.225_71194 1234 225 11078 07/11/1994 192/22:26:18.000 0 4250 4000 1234 71194 29624 07/16/1994 197/05:30:01.000 0 4250 4000 NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/EW9409/1235.v0.omute.stk.225_11762 1235 225 19012 07/16/1994 197/07:04:18.000 0 5500 4000 1235 11762 21287 07/16/1994 197/23:28:48.000 0 5500 4000 NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/EW9409/1237.v1.iomute.stk.13624_28618 1237 13624 30913 07/19/1994 200/05:23:40.000 0 4250 4000 1237 28618 34872 07/20/1994 201/04:43:22.000 0 4250 4000 NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/EW9409/1237.v1.ryu.stk.5852_15000 1237 5852 28955 07/18/1994 199/17:52:34.000 4000 3250 4000 1237 15000 31203 07/19/1994 200/07:18:10.000 0 4250 4000 NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/EW9409/1237.v1.vf.stk.5841_9000 1237 5841 28952 07/18/1994 199/17:51:32.000 5000 3000 4000 1237 9000 29746 07/18/1994 199/22:44:21.000 5000 3000 4000 NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/EW9409/1238.v4.omute.stk.225_11791 1238 225 34873 07/20/1994 201/05:45:25.000 0 4250 4000 1238 11791 37645 07/20/1994 201/21:54:37.000 0 4250 4000 NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/EW9409/1239.omute.stk.225_5355 1239 225 37648 07/20/1994 201/23:11:23.000 0 4250 4000 1239 5355 38816 07/21/1994 202/05:58:40.000 0 4250 4000 NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/EW9409/1240.v4.omute.stk.225_7116 1240 225 38856 07/21/1994 202/06:15:38.000 0 4250 4000 1240 7116 40494 07/21/1994 202/15:21:07.000 0 4000 4000 NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/EW9409/1241.v2.omute.stk.225_22596 1241 225 40538 07/21/1994 202/15:55:20.000 0 4000 4000 1241 22596 46129 07/22/1994 203/22:58:47.000 0 4000 4000 NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/EW9409/1242.v3.vfomute.stk.225_19075 1242 225 46144 07/23/1994 204/00:21:11.000 0 4000 4000 1242 19075 50737 07/24/1994 205/01:51:33.000 0 4000 4000 NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/EW9409/1243.v1.iomute.stk.225_41555 1243 225 50767 07/24/1994 205/05:02:32.000 0 4000 4000 1243 41555 61156 07/26/1994 207/14:46:10.000 0 4000 4000 NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/EW9409/1244.stk.225_33312 1244 225 646 07/27/1994 208/04:15:46.000 0 4000 4000 1244 33152 8376 07/29/1994 210/01:21:12.000 0 4000 4000 NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/EW9409/1246.stk.225_23713 1246 225 10471 07/29/1994 210/14:03:44.000 0 4000 4000 1246 23713 16373 07/30/1994 211/22:50:51.000 0 4000 4000 NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/EW9409/1247.stk.225_22634 1247 225 16377 07/31/1994 212/00:08:52.000 0 4000 4000 1247 22634 21592 08/01/1994 213/05:06:53.000 0 4000 4000 NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/EW9409/1248.stk.225_22065 1248 225 21596 08/01/1994 213/06:18:13.000 0 4000 4000 1248 22065 26759 08/02/1994 214/10:58:53.000 0 4000 4000 NEXT FILE /data/mstorer2/ldeo_1/users/link/seismic/processed/EW9409/1249.stk.225_9020 1249 225 26763 08/02/1994 214/11:26:02.000 0 4000 4000 1249 9020 28729 08/02/1994 214/22:20:17.000 0 4000 4000 processing system LDEO MCS Inhouse processing edit traces, Band Pass filter with decimation to 4 msecs, outside mute, some lines inside mute,normal moveout and stack A few lines were fk filtered. cdp spacing 12.5 meters ------------------------------------------------------------------------------------- EW9409 Seismic Acquisition Parameters ********************************************************** Number of Channels 160 Group Spacing 25 meters Below are the offsets used for the processed files. I suspect that the correct numbers are 255 and 95. The second group of lines were processed at a later date by Peter Buhl. He must have determined the near offset to be 255 meters and adjusted the antenna to source distance so that the position of the cdps would remain the same. I've asked John Diebold about this as well as the exact source volume. Lines 1232-1237,1243: Source to Near Channel 225 meters Antenna to Source 95 meters Lines 1238-1242,1244-1249 Source to Near Channel 255 meters Antenna to Source 80 meters Near Channel Number 160 Cable Depth 7.5 meters Acquisition System Name DMS2000 Source Volume 8400 cu. in. Source Pressure 2000 psi Source Type Bolt 1500C Source Number 20 Source Depth 7.5 meters Shot Control Time (20 sec interval for ~ 50 meters) Acquisition Sample Interval 2000 microseconds Record Length 16-17 seconds Compass No Active Tail Buoy No Recording Delay No Acquisition System Digital 2 or more ships No ********************************************************** ********************************************************** **********************************************************