Marine Geoscience Data System

Seismic Reflection/Refraction Data at the Academic Seismic Portal

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Expeditions / Compilations

EW9908

Maurice Ewing

EW9907

Maurice Ewing

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Acquisition Information

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Seismic:Reflection:MCS

Raw Multi-Channel Seismic Shot Data from the Nankai Trough and Subduction Zone, a MARGINS Focus Site, acquired during the R/V Maurice Ewing expedition EW9907 (1999)

Platform Info

Array:Maurice Ewing

LDEO

Device Info

Seismic:MCS

Events

Line Log

Locale

NankaiTrough

FocusSite:MARGINS

File Format

SEGY

Quality

Details

These lines are the first part of the EW9907-EW9908 Nankai 3-D project.

Bangs, Nathan

UTIG

Shipley, Thomas

UTIG

Moore, Casey

Moore, Gregory

Morgan, Julia

Data Set References

Seismic:Reflection:MCS

Data DOI: 10.1594/IEDA/322428

Raw Multi-Channel Seismic Shot Data from the Nankai Trough and Subduction Zone acquired during the R/V Maurice Ewing expedition EW9908 (1999)

Platform Info

Array:Maurice Ewing

LDEO

Device Info

Seismic:MCS

Events

Line Log

Locale

NankaiTrough

FocusSite:MARGINS

File Format

SEGY

Quality

Details

These files are Part 2 of the EW9907-08 Nankai 3D project.

Bangs, Nathan

UTIG

Shipley, Thomas

UTIG

Moore, Casey

Moore, Gregory

Morgan, Julia

Data Set References

Event Logs

Line (EW9908)

Device Info

Seismic:MCS

Platform: Maurice Ewing (Array)

Bangs, Nathan

UTIG

Seismic Acquisition Parameters

Download As Text

EW9908_ACQ001 (Lines: All Lines (Sequence 56-119))

Source Information

AirGun (BOLT:1900LL)

Source Number: 14

Volume (cu in): 4276

Pressure (psi): 2000

Depth (m): 8

Shot Interval (m): 50

Distance to Near Channel (m): 188

Number of Arrays: 1

Receiver Information

Hydrophone:Streamer

Number of Cables: 1

Channels Per Cable: 240

Channels Recorded: 240

Group Spacing (m): 25

Cable Length (m): 6000

Near Channel Number: 240

Used Active Tail Buoy: true

Used Compass Birds: true

Nav System

FUGRO DGPS and P-code GPS

WGS84

Acquisition System

Digital

Name: SYNTRAK 480

Sample Interval (msec): 2

Record Length (sec): 12.2888

Details

Sequence numbers are continued from EW9907

Cable Depth varied from 8-10 meters

Source to Tasmon Antenna distance = 56 meters

Source to Fugro Antenna distance = 56 meters

Event Logs

Line (EW9907)

Device Info

Seismic:MCS

Platform: Maurice Ewing (Array)

Bangs, Nathan

UTIG

Line (EW9907)

Device Info

Seismic:MCS

Platform: Maurice Ewing (Array)

Bangs, Nathan

UTIG

Seismic Acquisition Parameters

Download As Text

EW9907_ACQ001 (Lines: All Lines, Sequence 1-55)

Source Information

AirGun (BOLT:1900LL)

Source Number: 14

Volume (cu in): 4276

Pressure (psi): 2000

Depth (m): 8

Shot Interval (m): 50

Distance to Near Channel (m): 188

Distance to Antenna (m): 56

Number of Arrays: 1

Receiver Information

Hydrophone:Streamer

Number of Cables: 1

Channels Per Cable: 240

Channels Recorded: 240

Group Spacing (m): 25

Cable Length (m): 6000

Near Channel Number: 240

Used Active Tail Buoy: true

Used Compass Birds: true

Nav System

Fugro DGPS receiver and Tasman P-code GPS

WGS84

Acquisition System

Digital

Name: SYNTRAK 480

Sample Interval (msec): 2

Record Length (sec): 12.288

Details

Cable Depth was 8m at the start and lowered to 10m for most of the rest of the cruise (from Cruise Report)

edu.utexas.ig:ew9907_acq001 (Lines: )

Source Information

AirGun

Receiver Information

Hydrophone:Streamer

Used Active Tail Buoy: false

Used Compass Birds: false

Nav System

Differential GPS with a final post-cruise UKOOA 90 P1 navigation format (EW9907.v19.ukooa; 932 MB uncompressed; 290 MB compressed). This format includes all the important data associated with the navigation systems; antennas positions; cable compasses and positions for each source of the approximately 150;000 shots and each of the 240 channels. In addition there is the 'standard' *.nav file of just shot locations for the cruise and by line.

WGS84

Acquisition System

Digital

Name: Syntrack 480-24

Details

Receiver Type: Hydrophone_Streamer

Source Type: SeismicSource_Gun_Air

Acquisition System Name: Syntrack 480-24

Acquisition System Type: digital

Seismic Nav System: Differential GPS with a final post-cruise UKOOA 90 P1 navigation format (EW9907.v19.ukooa; 932 MB uncompressed; 290 MB compressed). This format includes all the important data associated with the navigation systems; antennas positions; cable compasses and positions for each source of the approximately 150;000 shots and each of the 240 channels. In addition there is the 'standard' *.nav file of just shot locations for the cruise and by line.

Survey Datum: WGS84

Source to Near Channel (m): 188

Antenna to Source (m): 56

Number of Channels Recorded: 240

Channel Length (m): 25

Cable Receiver Depth (m): 8

Source Volume (cubicInches): 4276

Source Pressure (bars): 138

Source Number: 14

Source Depth (m): 6

Shot Control: distance

Shot Interval (s or m): 50

Compass Birds: no

Tail Buoy Positioning: no

Recording Delay: no

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