Marine Geoscience Data System

Seismic Reflection/Refraction Data at the Academic Seismic Portal

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Expeditions / Compilations

MGL0804

Marcus G. Langseth

Processed

Raw

Acquisition Information

Raw Data Sets

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Backscatter:Acoustic, Bathymetry:Swath, Sidescan

Data at NOAA:NCEI

Platform Info

Marcus G. Langseth

LDEO

Device Info

Sonar:Multibeam

Kongsberg:EM120

Locale

CentralAmerica

SubductionZone

File Format

MBSystem

Quality

Holbrook, W. Steven

University of Wyoming

Backscatter:Acoustic, Bathymetry:Swath, Sidescan

Multibeam sonar bathymetry and backscatter data from the western Caribbean Sea offshore Costa Rica and Nicaragua collected in 2008 on Langseth cruise MGL0804 (investigators Holbrook, van Avendonk, Cheadle, Kelemen, Lizarralde)

Platform Info

Marcus G. Langseth

LDEO

Device Info

Sonar:Multibeam

Kongsberg:EM120

Locale

CentralAmerica

SubductionZone

File Format

MBSystem

Quality

Holbrook, W. Steven

University of Wyoming

Event Logs

Line (MGL0804)

Device Info

Related Devices

Holbrook, W. Steven

University of Wyoming

Station:Bottom (MGL0804)

Device Info

Related Devices

Holbrook, W. Steven

University of Wyoming

Station:Land (MGL0804)

Lizarralde, Dan

WHOI

Station:WaterColumn:Released (MGL0804)

Device Info

Probe:Expendable:XCTD

Sippican

Platform: Marcus G. Langseth

Holbrook, W. Steven

University of Wyoming

Station:WaterColumn:Released (MGL0804)

Device Info

Probe:Expendable:XBT

Sippican:T-5

Platform: Marcus G. Langseth

Holbrook, W. Steven

University of Wyoming

Station:WaterColumn:Released (MGL0804)

Device Info

Probe:Expendable:XBT

Sippican:T-7

Platform: Marcus G. Langseth

Holbrook, W. Steven

University of Wyoming

Seismic Acquisition Parameters

Download As Text

MGL0804_ACQ001 (Lines: Sequence 01,02,03)

Source Information

AirGun (BOLT:1500LL)

Source Number: 40

Volume (cu in): 6600

Pressure (psi): 2000

Shot Interval (m): 150

Distance to Near Channel (m): 77.5

Distance to Antenna (m): 147.37

Number of Arrays: 1

Receiver Information

Hydrophone:Streamer (SERCEL:Sentry)

Number of Cables: 1

Channels Per Cable: 636

Channels Recorded: 636

Group Spacing (m): 12.5

Cable Length (m): 7950

Cable Depth (m): 6

Near Channel Number: 636

Used Active Tail Buoy: true

Used Compass Birds: true

Nav System

Cnav-primary

WGS84

Acquisition System

Digital

Name: Syntron Syntrak 960

Sample Interval (msec): 2

Record Length (sec): 16.384

Details

Source Depth was variable

MGL0804_ACQ002 (Lines: Sequence 04-24)

Source Information

AirGun (BOLT:1500LL)

Source Number: 40

Volume (cu in): 6600

Pressure (psi): 2000

Distance to Near Channel (m): 143.5

Distance to Antenna (m): 97.37

Number of Arrays: 1

Receiver Information

Hydrophone:Streamer (SERCEL:Sentry)

Number of Cables: 1

Group Spacing (m): 12.5

Cable Length (m): 7950

Cable Depth (m): 6

Used Active Tail Buoy: true

Used Compass Birds: true

Nav System

Cnav-primary

WGS84

Acquisition System

Digital

Name: Syntron Syntrak 960

Details

Number of channels was 240 for Sequence 19, 636 for all other lines

Near Channel Number was 240 for Seq 19, 636 for all other lines

Number of source_arrays: 1 Array = 4 Strings

Source Depth was variable

ShotControl was 20sec for all OBS lines

Shot Interval for Seq 04 and 05 was 150m, Seq 06-21 was 50m, Seq 23 was 25m, Seq 24 was 50m

Sample Interval (microseconds) for Seq 19(H06&OB6) was 500, Seq 20(H07.001) was 4000, all other lines=2000

Record Length for Seq 01-18(H05), Seq 20-22 and Seq 24 was 16.384, Seq 19(H06&OB6) was 8.192, Seq 18(OB5) was 1.024 seconds.

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