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Seismic Reflection/Refraction Data at the Academic Seismic Portal

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Expeditions / Compilations

MGL0812

Marcus G. Langseth

Processed

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Acquisition Information

Raw Data Sets

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Navigation:Primary

Raw ship-based Navigation Data from the East Pacific Rise at 9N acquired during the Marcus G. Langseth expedition MGL0812 (2008)

Platform Info

Marcus G. Langseth

LDEO

Device Info

Navigation

C&C Technologies:CNAV

Locale

EPR:9N

SpreadingCenterSegment

File Format

ASCII

Quality

Details

File generated by Anthony Johnson from CNAV GPS data. Lat/lon values are for vessel reference point.

Mutter, John

LDEO

Carbotte, Suzanne

LDEO

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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