Marine Geoscience Data System

Seismic Reflection/Refraction Data at the Academic Seismic Portal

Expeditions / Compilations

EW9509

Maurice Ewing

Raw

Acquisition Information

Raw Data Sets

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Seismic:Ancillary

Multi-Channel Seismic Data from the Philippine Sea (Western) acquired during the Maurice Ewing expedition EW9509 (1995)

Platform Info

Array:Maurice Ewing

LDEO

Device Info

Seismic:MCS

LDEO

Events

Line Log

Locale

PhilippineSea:Western

Sea

File Format

ASCII

Quality

Reed, Don

San Jose State University

Liu, Char-Shine

NTU

Seismic:Reflection:MCS

Data DOI: 10.1594/IEDA/309962

Raw Multi-Channel Seismic Shot Data from the Western Philippine Sea acquired during R/V Maurice Ewing expedition EW9509 (1995)

Platform Info

Array:Maurice Ewing

LDEO

Device Info

Seismic:MCS

LDEO

Events

Line Log

Locale

PhilippineSea:Western

Sea

File Format

SEGY

Quality

Reed, Don

San Jose State University

Liu, Char-Shine

NTU

Data Set References

Event Logs

Line (EW9509)

Device Info

Related Devices

Reed, Don

San Jose State University

Line (EW9509)

Device Info

Seismic:MCS

Platform: Maurice Ewing (Array)

Liu, Char-Shine

NTU

Seismic Acquisition Parameters

Download As Text

EW9509_ACQ001 (Lines: Lines 01,03,23-35)

Source Information

AirGun (BOLT:1500C)

Source Number: 20

Volume (cu in): 8425

Pressure (psi): 2000

Shot Interval (sec): 20

Number of Arrays: 1

Receiver Information

Hydrophone:Streamer

Number of Cables: 1

Channels Per Cable: 160

Channels Recorded: 160

Group Spacing (m): 25

Cable Length (m): 4000

Near Channel Number: 160

Nav System

GPS

WGS84

Acquisition System

Digital

Name: DMS2000

Sample Interval (msec): 2

Record Length (sec): 16.384

Details

Shot Sequence and time in headers do not match up with the shot/time entries in the ts.n files

Dates/times are zero for lines 01 (all), 03, 19, 19a, 23, 24, 29

LDEO has no additional information that would allow matching navigation with shots

LDEO has no information about source-receiver offset

There are no msecs in the headers. It is possible that the time is from the original SEGD general header which may differ from the true time

For some lines shot number is reset to 1 in the middle of the line

Lines 01, 03, 19, 19a, 21-24 were flagged as IBM Floating Point

Lines 20b, 25-49 were flagged as IEEE Floating Point

Line 28b contained only a partial trace after shot 138, trace 40. It is assumed to be incomplete.

EW9509_ACQ002 (Lines: Lines 19-22)

Source Information

AirGun (BOLT:1500C)

Source Number: 20

Volume (cu in): 8425

Pressure (psi): 2000

Shot Interval (sec): 20

Number of Arrays: 1

Receiver Information

Hydrophone:Streamer

Number of Cables: 1

Channels Per Cable: 156

Channels Recorded: 156

Group Spacing (m): 25

Cable Length (m): 4000

Near Channel Number: 156

Nav System

GPS

WGS84

Acquisition System

Digital

Name: DMS2000

Sample Interval (msec): 2

Record Length (sec): 16.384

Details

See ACQ_001

EW9509_ACQ003 (Lines: Lines 45-48)

Source Information

AirGun (BOLT:1500C)

Source Number: 20

Volume (cu in): 8425

Pressure (psi): 2000

Shot Interval (sec): 20

Number of Arrays: 1

Receiver Information

Hydrophone:Streamer

Number of Cables: 1

Channels Per Cable: 144

Channels Recorded: 144

Group Spacing (m): 25

Cable Length (m): 4000

Near Channel Number: 144

Nav System

GPS

WGS84

Acquisition System

Digital

Name: DMS2000

Sample Interval (msec): 2

Record Length (sec): 16.384

Details

See ACQ_001

EW9509_ACQ004 (Lines: Line 49 only)

Source Information

AirGun (BOLT:1500C)

Source Number: 20

Volume (cu in): 8425

Pressure (psi): 2000

Shot Interval (sec): 20

Number of Arrays: 1

Receiver Information

Hydrophone:Streamer

Number of Cables: 1

Channels Per Cable: 128

Channels Recorded: 128

Group Spacing (m): 25

Near Channel Number: 128

Nav System

GPS

WGS84

Acquisition System

Digital

Name: DMS2000

Sample Interval (msec): 2

Record Length (sec): 16.384

Details

See ACQ_001

EW9509_ACQ005 (Lines: Lines 2,4-18,36-44)

Source Information

AirGun (BOLT:1500C)

Source Number: 20

Volume (cu in): 8425

Pressure (psi): 2000

Shot Interval (sec): 20

Number of Arrays: 1

Receiver Information

Hydrophone:Streamer

Number of Cables: 1

Group Spacing (m): 25

Nav System

GPS

WGS84

Acquisition System

Digital

Name: DMS2000

Sample Interval (msec): 2

Record Length (sec): 16.384

Details

See ACQ_001

edu.utexas.ig:ew9509_acq001 (Lines: )

Source Information

AirGun

Receiver Information

Hydrophone:Streamer

Used Active Tail Buoy: false

Used Compass Birds: false

Nav System

differential GPS using data received simultaneously onboard the R/V Ewing and at a base station at the National Taiwan University

WGS84

Acquisition System

Digital

Name: Reftek recorders Kinematrics K2 recorders

Details

Receiver Type: Hydrophone_Streamer

Source Type: SeismicSource_Gun_Air

Acquisition System Name: Reftek recorders Kinematrics K2 recorders

Acquisition System Type: digital

Seismic Nav System: differential GPS using data received simultaneously onboard the R/V Ewing and at a base station at the National Taiwan University

Survey Datum: WGS84

Source to Near Channel (m): null

Antenna to Source (m): null

Number of Channels Recorded: 160

Channel Length (m): 25

Cable Receiver Depth (m): null

Source Volume (cubicInches): 8425

Source Pressure (bars): null

Source Number: 20

Source Depth (m): null

Shot Control: time

Shot Interval (s or m): 20

Compass Birds: no

Tail Buoy Positioning: no

Recording Delay: no

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