Marine Geoscience Data System

Seismic Reflection/Refraction Data at the Academic Seismic Portal

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Expeditions / Compilations

MGL0812

Marcus G. Langseth

Processed

Acquisition Information

Processed Data Sets

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Backscatter:Acoustic, Bathymetry:Swath, Sidescan

Processed multibeam bathymetry and acoustic backscatter data collected in 2008 at the East Pacific Rise 9-50N study site during Langseth cruise MGL0812 (investigator Suzanne Carbotte)

Platform Info

Marcus G. Langseth

LDEO

Device Info

Sonar:Multibeam

Kongsberg:EM120

Locale

EPR:9N

SpreadingCenterSegment

File Format

MBSystem

Quality

Carbotte, Suzanne

LDEO

Data Set References

Backscatter:Acoustic, Bathymetry:Swath, Sidescan

Data DOI: 10.26022/IEDA/316808

Processed ship-based Multibeam Sonar Data (version 2) acquired along the East Pacific Rise (EPR) near Segment 9N during the Marcus G. Langseth expedition MGL0812 (2008)

Platform Info

Marcus G. Langseth

LDEO

Device Info

Sonar:Multibeam

Kongsberg:EM120

Locale

EPR:9N

SpreadingCenterSegment

File Format

MBSystem

Quality

GMRT,

Event Logs

Line (MGL0812)

Device Info

Related Devices

Mutter, John

LDEO

Line (MGL0812)

Device Info

Seismic:MCS

Platform: Marcus G. Langseth (Array)

Mutter, John

LDEO

Station:WaterColumn:Released (MGL0812)

Device Info

Probe:Expendable:XBT

Sippican:T-5

Platform: Marcus G. Langseth

Mutter, John

LDEO

Seismic Acquisition Parameters

Download As Text

MGL0812_ACQ001 (Lines: )

Source Information

AirGun (BOLT:1500LL)

Source Number: 18

Volume (cu in): 3300

Pressure (psi): 2000

Depth (m): 7.5

Shot Interval (m): 37.5

Distance to Near Channel (m): 200

Distance to Antenna (m): 299.57

Number of Arrays: 2

Source Array Separation (m): 75

Receiver Information

Hydrophone:Streamer (SERCEL:Sentry)

Number of Cables: 4

Channels Per Cable: 468

Channels Recorded: 1872

Group Spacing (m): 12.5

Cable Spacing (m): 150

Cable Length (m): 5850

Cable Depth (m): 10

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): 10

Details

18 guns each source array

Near Channel Number for each streamer is 468, 936, 1404, 1872

Record Length for Sequence 1 (AXIS1) is 8 seconds. The rest of the lines were recorded for 10 seconds. Cable Depth is 7.5m for Sequence 1, 2, 3, 4 (AXIS1, AXIS2, AXIS3, AXIS2R1), 15m for Sequence 5 (Transit1). Cable Depth was 10m for the rest of the lines

Source to Near Channel Distance is given as an approximation, use P1/P2 files for greater accuracy.

org.marine-geo:MGL0812_ACQ001 (Lines: )

Source Information

AirGun

Receiver Information

Hydrophone:Streamer

Used Active Tail Buoy: true

Used Compass Birds: true

Nav System

Cnav-primary

WGS84

Acquisition System

Digital

Name: Syntron Syntrak 960

Details

Receiver Type: Hydrophone_Streamer

Source Type: SeismicSource_Gun_Air

Acquisition System Name: Syntron Syntrak 960

Acquisition System Type: digital

Seismic Nav System: Cnav-primary

Survey Datum: WGS84

Source to Near Channel (m): null

Antenna to Source (m): 299.57

Number of Channels Recorded: 1872

Channel Length (m): 12.5

Cable Receiver Depth (m): 7.5: sequence 1, 2, 3, 4 (AXIS1, AXIS2, AXIS3, AXIS2R1); 15: sequence 5 (Transit1); 10: rest of lines

Source Volume (cubicInches): 3300

Source Pressure (bars): 138

Source Number: 36

Source Depth (m): 7.5

Shot Control: distance

Shot Interval (s or m): 37.5

Compass Birds: yes

Tail Buoy Positioning: yes

Recording Delay: no

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