EW9416 Bathymetry:Swath

Processed ship-based Multibeam Sonar Data acquired during the Maurice Ewing expedition EW9416 (1994)

This data set was acquired with a ship-based Atlas Hydrosweep DS Multibeam Sonar system during Maurice Ewing expedition EW9416 conducted in 1994 (Chief Scientist: Dr. Robert Detrick). These data files are of MBSystem Compatible format and include Swath Bathymetry data and were processed at sea using the open source MB-System multibeam sonar processing software. Data were acquired as part of the project(s): A Seismic Experiment at Hole 504B: Correlation of Geologic and Seismic Structure, and funding was provided by NSF grant(s): OCE90-00603 and OCE93-01058.

Detrick, Robert

Investigator

WHOI

Device Info

Sonar:Multibeam

Atlas:Hydrosweep DS

Platform

Maurice Ewing

LDEO

Awards

N000XX-XX-X-XXXX

OCE93-01058

Quality

The data have been processed/modified to a level beyond that of basic quality control (e.g. final processed sonar data, photo-mosaics).

Report Incorrect Information

Data Files

Documents

ISO/XML Metadata

Seismic Acquisition Parameters

Download as Text: EW9416

EW9416_ACQ001 (Lines: All Costa Rica Rift lines 1267-1285)

Source Information

AirGun (BOLT:1500C)

Source Number: 10

Volume (cu in): 3005

Pressure (psi): 2000

Depth (m): 7

Shot Interval (sec): 13

Distance to Near Channel (m): 187

Distance to Antenna (m): 88

Number of Arrays: 1

Receiver Information

Hydrophone:Streamer

Number of Cables: 1

Channels Per Cable: 160

Channels Recorded: 160

Group Spacing (m): 25

Cable Length (m): 4000

Cable Depth (m): 10

Near Channel Number: 160

Used Active Tail Buoy: false

Used Compass Birds: true

Nav System

GPS, transit satellite fix, Furuno

WGS84

Acquisition System

Digital

Name: DMS2000

Sample Interval (msec): 2

Record Length (sec): 10

Details

The line numbers 1267-1285 were assigned at LDEO after the cruise.

The list below shows the correspondence between those numbers and the

'CRR' line numbers used at sea

LDEO AT SEA -- SHOTS

1267 (CRR01 B) 2-1026

1268 (CRR02 C) 110-1041

1269 (CRR03 A) 102-1393

1270 (CRR04 E) 102-805

1271 (CRR04 E) 812-1271

1272 (CRR04 E) 1272-1661

1273 (CRR04 E) 1662-2289

1274 (CRR04 E) 2290-3850

1275 (CRR09 B) 104-649

1276 (CRR09 B) 650-1805

1277 (CRR09 B) 1806-2316

1278 (CRR12 ) 101-2266

1279 (CRR12 ) 2267-2846

1280 (CRR12 B) 101-1261

1281 (CRR12 B) 1262-1764

1282 (CRR13 ) 101-4216

1283 (CRR14 ) 101-722

1284 (CRR14 ) 723-1800

1285 (CRR14 ) 1801-2565

EW9416_ACQ002 (Lines: Hole 504B Survey: lines 1-2)

Source Information

AirGun (BOLT:1500C)

Source Number: 10

Volume (cu in): 3005

Shot Interval (sec): 15

Distance to Near Channel (m): 187

Distance to Antenna (m): 88

Number of Arrays: 1

Receiver Information

Hydrophone:Streamer

Number of Cables: 1

Channels Per Cable: 160

Channels Recorded: 160

Group Spacing (m): 25

Cable Length (m): 4000

Cable Depth (m): 9

Near Channel Number: 160

Used Active Tail Buoy: false

Used Compass Birds: true

Nav System

GPS, transit satellite fix, Furuno

WGS84

Acquisition System

Digital

Name: DMS2000

Sample Interval (msec): 2

Record Length (sec): 10

Details

Source depth: 7-10 meters

EW9416_ACQ003 (Lines: Hole 504B Survey: SCS lines 3-16)

Source Information

AirGun (BOLT:1500C)

Number of Arrays: 1

Receiver Information

Hydrophone:Streamer

Number of Cables: 1

Cable Length (m): 137

Used Active Tail Buoy: false

Nav System

GPS, transit satellite fix, Furuno

WGS84

Acquisition System

Digital

Name: DMS2000

Sample Interval (msec): 2

Record Length (sec): 6

Details

Single Channel Streamer Details from Cruise Report:"The SCS streamer is configured with a 188 m leader, a 25 m stretch section, and four active sections totaling 137 m (12.5 m, 25 m, 50 m and 50 m). The data are recorded on DMS2000 data tapes on channels 4 (raw data) and channel 5 (attenuated by a factor of 20 across the entire frequency band of 0-160 Hz) (note: a total of 8 channels are recorded on the data tape, channels 1-3 and 6-8 are dummy channels)." NOTE: We assume the 4 streamer sections were summed before being recorded. There are actually 12 traces for each single channel line on tape

Source volume: 3005 cu. in. lines 3-4,6-9,10A-16, 8420 cu. in. lines 5,10

Source Number: 10 guns lines 3-4,6-9,10A-16, 20 guns used for lines 5,10

Source Depth: 5-6 meters

Shot Interval: 13 sec for lines 3-4,6-9,11-13,16

65 sec interval for line 5 shots 102-497

65 sec interval for line 10 shots 101-453

65 sec interval for lines 10A,14,15

43 sec interval for line 5 shots 498-1062

84 sec interval for line 10 shots 454-812

edu.utexas.ig:ew9416_acq001 (Lines: )

Source Information

AirGun

Receiver Information

Hydrophone:Streamer

Used Active Tail Buoy: false

Used Compass Birds: false

Nav System

WGS84

Acquisition System

Digital

Name: DMS 2000

Details

Receiver Type: Hydrophone_Streamer

Source Type: SeismicSource_Gun_Air

Acquisition System Name: DMS 2000

Acquisition System Type: digital

Seismic Nav System: null

Survey Datum: WGS84

Source to Near Channel (m): 187

Antenna to Source (m): 88

Number of Channels Recorded: 160

Channel Length (m): 25

Cable Receiver Depth (m): 10

Source Volume (cubicInches): 3005

Source Pressure (bars): 138

Source Number: 10

Source Depth (m): 7

Shot Control: time

Shot Interval (s or m): 13

Compass Birds: no

Tail Buoy Positioning: no

Recording Delay: no

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