Marine Geoscience Data System

Seismic Reflection/Refraction Data at the Academic Seismic Portal

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Expeditions / Compilations

EW9415

Maurice Ewing

Processed

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Acquisition Information

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Seismic:Navigation:ShotTime

Data DOI: 10.1594/IEDA/321663

Seismic Shot Point Navigation Data from the Northridge earthquake epicenter, offshore Los Angeles, California, acquired during the R/V Maurice Ewing expedition EW9415 (1994)

Platform Info

Array:Maurice Ewing

LDEO

Device Info

Seismic:MCS

Events

Line Log

Locale

PacificOcean

Ocean

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.

Henyey, Thomas

Brocher, Thomas

USGS

Seismic:Reflection:MCS

Data DOI: 10.1594/IEDA/321662

Multi-Channel Seismic Shot Data from offshore Los Angeles, California acquired during the R/V Maurice Ewing expedition EW9415 (1994)

Platform Info

Array:Maurice Ewing

LDEO

Device Info

Seismic:MCS

Events

Line Log

Locale

PacificOcean

Ocean

File Format

SEGY

Quality

Henyey, Thomas

Brocher, Thomas

USGS

Event Logs

Line (EW9415)

Device Info

Related Devices

Brocher, Thomas

USGS

Line (EW9415)

Device Info

Seismic:MCS

Platform: Maurice Ewing (Array)

Henyey, Thomas

Seismic Acquisition Parameters

Download As Text

EW9415_ACQ001 (Lines: Lines Sequence 01-08,10-17)

Source Information

AirGun (BOLT)

Source Number: 1

Volume (cu in): 8470

Pressure (psi): 2000

Shot Interval (m): 50

Distance to Near Channel (m): 187.5

Distance to Antenna (m): 87.4

Number of Arrays: 1

Receiver Information

Hydrophone:Streamer

Number of Cables: 1

Channels Per Cable: 180

Channels Recorded: 160

Group Spacing (m): 25

Cable Length (m): 4000

Near Channel Number: 160

Used Active Tail Buoy: false

Used Compass Birds: true

Nav System

GPS

WGS84

Acquisition System

Digital

Name: DMS2000

Sample Interval (msec): 2

Record Length (sec): 16

Details

Streamer Depth was 10-12m

Source Depth was 8-10m

If, when shooting by Distance, currents caused the shot interval to be less than 19 secs, the shot control was switched to Time with a shot interval of 20s. This first occurred on Sequence 5 at 289/0353 (see cruise report).

EW9415_ACQ002 (Lines: Line Sequence 9)

Source Information

AirGun (BOLT)

Source Number: 1

Volume (cu in): 8470

Pressure (psi): 2000

Shot Interval (sec): 90

Distance to Near Channel (m): 187.5

Distance to Antenna (m): 87.4

Number of Arrays: 1

Receiver Information

Hydrophone:Streamer

Number of Cables: 1

Channels Per Cable: 180

Channels Recorded: 160

Group Spacing (m): 25

Cable Length (m): 4000

Near Channel Number: 160

Used Active Tail Buoy: false

Used Compass Birds: true

Nav System

GPS

WGS84

Acquisition System

Digital

Name: DMS2000

Sample Interval (msec): 2

Record Length (sec): 16

Details

Streamer Depth was 10-12m

Source Depth was 8-10m

edu.utexas.ig:ew9415_acq001 (Lines: )

Source Information

AirGun

Receiver Information

Hydrophone:Streamer

Used Active Tail Buoy: false

Used Compass Birds: false

Nav System

GPS

WGS84

Acquisition System

Digital

Name: DMS 2000

Details

Receiver Type: Hydrophone_Streamer

Source Type: SeismicSource_Gun_Air

Acquisition System Name: DMS 2000

Acquisition System Type: digital

Seismic Nav System: GPS

Survey Datum: WGS84

Source to Near Channel (m): 162.5

Antenna to Source (m): 87.4

Number of Channels Recorded: 160

Channel Length (m): 25

Cable Receiver Depth (m): 10-12 m

Source Volume (cubicInches): 8470

Source Pressure (bars): 136.4

Source Number: 20

Source Depth (m): 11-Aug

Shot Control: time

Shot Interval (s or m): 20: except Line 3 (strong currents caused an increase in ship speed over the ground decreasing the shot time interval to less than then 19 seconds)

Compass Birds: no

Tail Buoy Positioning: no

Recording Delay: no

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