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:Navigation:ShotTime

Data DOI: 10.1594/IEDA/322431

Seismic Shot Point Navigation Data from the Nankai Trough and Subduction Zone acquired during 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

ASCII:TSN

Quality

Details

This dataset, Seismic Shot Point Navigation data, provides the primary seismic navigation source for this cruise and should be used for seismic data processing.

Bangs, Nathan

UTIG

Shipley, Thomas

UTIG

Moore, Casey

Moore, Gregory

Morgan, Julia

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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