Marine Geoscience Data System

Seismic Reflection/Refraction Data at the Academic Seismic Portal

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Expeditions / Compilations

EW9502

Maurice Ewing

Processed

Acquisition Information

Processed Data Sets

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Seismic:Velocity:Model

Data DOI: 10.60521/331888

Seismic P-wave velocity model (netCDF format) from a 1995 Costa Rica convergent margin seismic study (EW9502)

Platform Info

Array:Maurice Ewing

LDEO

Device Info

Seismic:OBS

Events

Station:Bottom:Deployed Log

Locale

CentralAmerica

SubductionZone

File Format

NetCDF:Grid

Quality

Christeson, Gail

McIntosh, Kirk

Nakamura, Yosio

Shipley, Thomas

Data Set References

Seismic:Velocity:Model

Data DOI: 10.60521/331892

Seismic P-wave velocity model (ASCII RAYINVR format) from a 1995 offshore Nicoya Peninsula seismic study (EW9502)

Platform Info

Array:Maurice Ewing

LDEO

Device Info

Seismic:OBS

Events

Station:Bottom:Deployed Log

Locale

CentralAmerica

SubductionZone

File Format

ASCII:RAYINVR

Quality

Christeson, Gail

McIntosh, Kirk

Nakamura, Yosio

Shipley, Thomas

Data Set References

Seismic:Velocity:Model

Data DOI: 10.60521/331893

Velocity model navigation file (ASCII format) from a 1995 offshore Nicoya Peninsula seismic study (EW9502)

Platform Info

Array:Maurice Ewing

LDEO

Device Info

Seismic:OBS

Events

Station:Bottom:Deployed Log

Locale

CentralAmerica

SubductionZone

File Format

ASCII

Quality

Christeson, Gail

McIntosh, Kirk

Nakamura, Yosio

Shipley, Thomas

Data Set References

Event Logs

Line (EW9502)

Device Info

Related Devices

McIntosh, Kirk

UTIG

Line (EW9502)

Device Info

Seismic:OBS

Platform: Maurice Ewing (Array)

Seismic:SCS

Platform: Maurice Ewing (Array)

McIntosh, Kirk

UTIG

Station:Bottom:Deployed (EW9502)

Device Info

Seismic:OBS

Platform: Maurice Ewing (Array)

McIntosh, Kirk

UTIG

Seismic Acquisition Parameters

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EW9502_ACQ001 (Lines: All EXP1, EXP3 lines: 103,100,101,102,104,105,303,305,301,302)

Source Information

AirGun (BOLT:1500C)

Source Number: 20

Volume (cu in): 8430

Pressure (psi): 2000

Distance to Near Channel (m): 137

Distance to Antenna (m): 87.4

Number of Arrays: 1

Receiver Information

Hydrophone:Streamer

Number of Cables: 1

Channels Per Cable: 2

Group Spacing (m): 50

Cable Length (m): 100

Cable Depth (m): 10

Nav System

ship: DGPS Magnavox 4200D, scientists: RAYCAL Multifix DGPS Service provided DGPS corrections via Inmarsat to 3 separate receivers

WGS84

Acquisition System

Digital

Name: DMS2000 with French AMG Analog streamer

Sample Interval (msec): 2

Details

Source Depth is unknown

Near Channel Number is unknown

Shot Interval was varied to give 50m for lines 103,101

Shot Interval was varied to give 75m for line 100

Shot Interval was varied to give 125m for lines 102,104,105

Shot Interval was varied to give 50m for all EXP3 lines

Record Length was 20s for EXP1 shots 5-630

Record Length was 16s for EXP1 shots 637-5318

Record Length was 10s for EXP3

Number of Channels: 8 channels were recorded, channels 1-2 contained MCS data, channels 3-8 believed to be empty

EW9502_ACQ002 (Lines: EXP2 lines from 201 through 235R: 201,211,202,213,205,215,207,217,209,219,229,221,231,223,233,225,235,227,237,228,236,226,234,224,232,222,230,220,210,218,208,216,206,214,204,212,203,220R,226R,235R)

Source Information

AirGun (BOLT:1500C)

Source Number: 16

Volume (cu in): 5895

Pressure (psi): 2000

Shot Interval (sec): 19

Distance to Near Channel (m): 137

Distance to Antenna (m): 87.4

Number of Arrays: 1

Receiver Information

Hydrophone:Streamer

Number of Cables: 1

Group Spacing (m): 50

Cable Length (m): 100

Cable Depth (m): 10

Nav System

ship: DGPS Magnavox 4200D, scientists: RAYCAL Multifix DGPS Service provided DGPS corrections via Inmarsat to 3 separate receivers

WGS84

Acquisition System

Digital

Name: DMS2000 with French AMG Analog streamer

Sample Interval (msec): 2

Record Length (sec): 10

Details

Source Depth is unknown

Near Channel Number is unknown

Number of Channels: 8 channels were recorded, channels 1-2 contained MCS data, channels 3-8 believed to be empty

EW9502_ACQ003 (Lines: EXP2 lines 239,238,242,241,240)

Source Information

AirGun (BOLT:1500C)

Source Number: 20

Volume (cu in): 8355

Pressure (psi): 2000

Shot Interval (sec): 19

Distance to Near Channel (m): 137

Distance to Antenna (m): 87.4

Number of Arrays: 1

Receiver Information

Hydrophone:Streamer

Number of Cables: 1

Group Spacing (m): 50

Cable Length (m): 100

Cable Depth (m): 10

Nav System

ship: DGPS Magnavox 4200D, scientists: RAYCAL Multifix DGPS Service provided DGPS corrections via Inmarsat to 3 separate receivers

WGS84

Acquisition System

Digital

Name: DMS2000 with French AMG Analog streamer

Sample Interval (msec): 2

Record Length (sec): 10

Details

Source Depth is unknown

Near Channel Number is unknown

Number of Channels: 8 channels were recorded, channels 1-2 contained MCS data, channels 3-8 believed to be empty

Use of compass birds and active tailbuoy is unknown

edu.utexas.ig:ew9502_acq001 (Lines: )

Source Information

AirGun

Receiver Information

NotApplicable

Used Active Tail Buoy: false

Used Compass Birds: false

Nav System

Differential GPS satellite navigation

WGS84

Acquisition System

Digital

Name: DSS 240

Details

Receiver Type: Hydrophone_Streamer; Seismometer_OceanBottom

Source Type: SeismicSource_Gun_Air

Acquisition System Name: DSS 240

Acquisition System Type: digital

Seismic Nav System: Differential GPS satellite navigation

Survey Datum: WGS84

Source to Near Channel (m): null

Antenna to Source (m): 87.4

Number of Channels Recorded: 2

Channel Length (m): null

Cable Receiver Depth (m): null

Source Volume (cubicInches): 5895-8420

Source Pressure (bars): 138

Source Number: 16-20

Source Depth (m): 10-Jun

Shot Control: null

Shot Interval (s or m): null

Compass Birds: no

Tail Buoy Positioning: no

Recording Delay: no

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