Marine Geoscience Data System

Seismic Reflection/Refraction Data at the Academic Seismic Portal

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Expeditions / Compilations

MGL1110

Marcus G. Langseth

MGL1903

Marcus G. Langseth

Processed

Acquisition Information

Processed Data Sets

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Seismic:Velocity:Model

Data DOI: 10.60521/331651

Seismic velocity grid, Alaska Langseth Experiment to Understand the megaThrust (ALEUT) Line 5, cruise MGL1110

Platform Info

Array:Marcus G. Langseth

LDEO

Device Info

Seismic:OBS

Events

Station:Bottom Log

Locale

Alaska:Aleutians

SubductionZone

File Format

NetCDF:Grid

Quality

Shillington, Donna

NAU

Bécel, Anne

LDEO

Nedimovic, Mladen

Dalhousie

Data Set References

Seismic:Velocity:Model

Data DOI: 10.60521/331829

3D P-wave velocity model of the Alaska Peninsula subduction zone from the AACSE active-source data set

Platform Info

Array:Marcus G. Langseth

LDEO

Device Info

Seismic:OBS

Events

Station:Bottom Log

Locale

Alaska:Aleutians

FocusSite:GeoPRISMS

File Format

ASCII

Quality

Acquisto, Tanner

LDEO

Bécel, Anne

LDEO

Canales, JuanPablo

WHOI

Beaucé, Eric

LDEO

Data Set References

Event Logs

Line (MGL1110)

Device Info

Related Devices

Shillington, Donna

LDEO

Line (MGL1110)

Device Info

Seismic:MCS

Platform: Marcus G. Langseth (Array)

Shillington, Donna

LDEO

Station:Bottom (MGL1110)

Device Info

Seismic:OBS

Platform: Marcus G. Langseth (Array)

Shillington, Donna

LDEO

Station:WaterColumn:Released (MGL1110)

Device Info

Probe:Expendable:XBT

Sippican:T-5

Platform: Marcus G. Langseth

Shillington, Donna

LDEO

Station:WaterColumn:Released (MGL1110)

Device Info

Probe:Expendable:XCTD

Sippican:XCTD-1

Platform: Marcus G. Langseth

Shillington, Donna

LDEO

Station:WaterColumn:Released (MGL1110)

Device Info

Probe:Expendable:XSV

Sippican:XSV-02

Platform: Marcus G. Langseth

Shillington, Donna

LDEO

Seismic Acquisition Parameters

Download As Text

MGL1110_ACQ001 (Lines: Sequence numbers 8-10)

Source Information

AirGun (BOLT:1500LL)

Source Number: 36

Volume (cu in): 6600

Pressure (psi): 2000

Depth (m): 12

Shot Interval (m): 62.5

Distance to Near Channel (m): 325.84

Distance to Antenna (m): 222.7

Number of Arrays: 1

Receiver Information

Hydrophone:Streamer

Number of Cables: 2

Channels Per Cable: 636

Channels Recorded: 1272

Group Spacing (m): 12.5

Cable Spacing (m): 450

Cable Length (m): 7950

Used Active Tail Buoy: true

Used Compass Birds: true

Nav System

CNAV 3050 - primary

WGS84

Acquisition System

Digital

Name: Syntron Syntrak 960

Sample Interval (msec): 2

Record Length (sec): 22.528

Details

Near channel numbers were 636 and 1272

Streamer 1 was towed at a depth of 9m, Streamer 2 at 12m

MGL1110_ACQ002 (Lines: Sequence numbers 11-26)

Source Information

AirGun (BOLT:1500LL)

Source Number: 36

Volume (cu in): 6600

Pressure (psi): 2000

Depth (m): 12

Shot Interval (m): 62.5

Distance to Antenna (m): 222.7

Number of Arrays: 1

Receiver Information

Hydrophone:Streamer

Number of Cables: 2

Channels Per Cable: 636

Channels Recorded: 1272

Group Spacing (m): 12.5

Cable Spacing (m): 225

Cable Length (m): 7950

Used Active Tail Buoy: true

Used Compass Birds: true

Nav System

CNAV 3050 - primary

WGS84

Acquisition System

Digital

Name: Syntron Syntrak 960

Sample Interval (msec): 2

Details

Streamer 1 was towed at a depth of 9m, Streamer 2 at 12m

Streamer 1 was towed from the stern, distance from center of source to near group was 235.68m

Streamer 2 was towed from the paravane, distance from center of source to near group was 325.84m

Near channel numbers were Streamer 1: 636 and Streamer 2 : 1272

Lines 11-26 were recorded for 22.528s except for part of Line 24 which was recorded only for 18.430s

MGL1110_ACQ003 (Lines: Sequence numbers 27-33)

Source Information

AirGun (BOLT:1500LL)

Source Number: 36

Volume (cu in): 6600

Pressure (psi): 2000

Depth (m): 12

Shot Interval (m): 62.5

Distance to Near Channel (m): 325.84

Distance to Antenna (m): 222.7

Number of Arrays: 1

Receiver Information

Hydrophone:Streamer

Number of Cables: 1

Channels Per Cable: 636

Channels Recorded: 636

Group Spacing (m): 12.5

Cable Length (m): 7950

Cable Depth (m): 12

Near Channel Number: 636

Used Active Tail Buoy: true

Used Compass Birds: true

Nav System

CNAV 3050 - primary

WGS84

Acquisition System

Digital

Name: Syntron Syntrak 960

Sample Interval (msec): 2

Details

Data was recorded by a single streamer, Streamer 2, towed from the paravane

Distance from center of source to near group was 325.84m

Lines 27-33 were recorded for 22.528s except for part of Line 29 which was recorded only for 18.430s

org.marine-geo:MGL1110_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:

Details

Receiver Type: Hydrophone_Streamer

Source Type: SeismicSource_Gun_Air

Acquisition System Name: null

Acquisition System Type: null

Seismic Nav System: null

Survey Datum: WGS84

Source to Near Channel (m): 235.68

Antenna to Source (m): 222.7

Number of Channels Recorded: null

Channel Length (m): null

Cable Receiver Depth (m): null

Source Volume (cubicInches): 6600

Source Pressure (bars): null

Source Number: 10

Source Depth (m): null

Shot Control: null

Shot Interval (s or m): null

Compass Birds: no

Tail Buoy Positioning: no

Recording Delay: no

Event Logs

Line (MGL1903)

Device Info

Seismic:MCS

LDEO

Platform: Marcus G. Langseth (Array)

Bécel, Anne

LDEO

Station:Bottom (MGL1110)

Device Info

Seismic:OBS

Platform: Marcus G. Langseth (Array)

Shillington, Donna

LDEO

Seismic Acquisition Parameters

Download As Text

MGL1903_ACQ001 (Lines: MCS/OBS Sequences 001-013.)

Source Information

AirGun (BOLT:1500LL)

Source Number: 36

Volume (cu in): 6600

Pressure (psi): 2000

Depth (m): 12

Shot Interval (m): 400

Distance to Near Channel (m): 191.7

Distance to Antenna (m): 230

Number of Arrays: 1

Receiver Information

Hydrophone:Streamer

Number of Cables: 1

Channels Per Cable: 324

Channels Recorded: 324

Group Spacing (m): 12.5

Cable Length (m): 4000

Cable Depth (m): 12

Near Channel Number: 1

Used Active Tail Buoy: true

Used Compass Birds: true

Nav System

C-Nav 3050 primary

WGS84

Acquisition System

Digital

Name: OBS and Sercel Seal 408

Sample Interval (msec): 2

Record Length (sec): 25

Details

Source was Bolt 1500LL and 1900LL. This set of acquisition parameters was used for the thirteen combined MCS/OBS lines.

MGL1903_ACQ002 (Lines: Sequences 014-023, OBS only.)

Source Information

AirGun (BOLT:1500LL)

Source Number: 36

Volume (cu in): 6600

Pressure (psi): 2000

Depth (m): 12

Shot Interval (m): 400

Distance to Antenna (m): 230

Number of Arrays: 1

Receiver Information

Seismic:OBS

Used Active Tail Buoy: false

Used Compass Birds: false

Nav System

C-Nav 3050 primary

WGS84

Acquisition System

Digital

Name: OBS

Details

Source was Bolt 1500LL and 1900LL. This set of acquisition parameters was used for airgun shooting to OBS instruments. No streamer was used so there are no cables or channels.

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