RC1903 Bathymetry:Singlebeam, Gravity:Field, Magnetic:Field

Ship-based Trackline Geophysical Data (MGD77) acquired during the Robert D. Conrad expedition RC1903 (1975)

This data set was acquired with a ship-based Gravimeter, Magnetometer, and Echosounder during Robert D. Conrad expedition RC1903 conducted in 1975 (Chief Scientist: Dr. John Ewing). These data files are of MGD77 format and include Gravity Field, Singlebeam Bathymetry, and Magnetic Field data that were processed after data collection. Funding was provided by NSF grant(s): DES75-15865.

Ewing, John

Investigator

LDEO

Device Info

Sonar:Echosounder

Device Info

Gravimeter

Device Info

Magnetometer

Platform

Robert D. Conrad

LDEO

Awards

DES75-15865

Data DOI

10.1594/IEDA/315139

Quality

A level of processing has been undertaken, ensuring quality control (e.g. ping edited sonar data, edited navigation data).

Report Incorrect Information

Data Files

Documents

Data Citation Information

ISO/XML Metadata

Seismic Acquisition Parameters

Download as Text: RC1903

edu.utexas.ig:rc1903_acq001 (Lines: 1,2,4,5,6,7)

Source Information

AirGun

Receiver Information

Hydrophone:Streamer

Used Active Tail Buoy: false

Used Compass Birds: false

Nav System

US Navy Transit Satellite

WGS72

Acquisition System

Digital

Name: DSF IV

(Recording Delay Used)

Details

Receiver Type: Hydrophone_Streamer

Source Type: SeismicSource_Gun_Air Bolt:1500C

Acquisition System Name: DSF IV

Acquisition System Type: digital

Seismic Nav System: US Navy Transit Satellite

Survey Datum: WGS72

Source to Near Channel: about 300m

The near trace offsets in the segy headers vary as shown. There is no explanation.

Line 1 282m for shots 225-1080

Line 1 307m for shots 1081-7096

Line 2 307m for shots 7100-7646

Line 2 279-282m for shots 9219-14736

Line 4 304-316m for shots 1-9864

Line 5 307-310m for shots 1-4768

Line 6 308-311m for shots 4895-8614

Line 7 305-318m for shots 2-2445

Antenna to Source: 40m

Number of Channels Recorded: 24

Near Channel Number: 24

Channel Length: 100m

Cable Receiver Depth (m): unknown

Source Volume (cubic inches): 1864

Source Pressure (bars): 138

Source Number: 4

Source Depth: unknown

Shot Control: Time

Shot Interval:

Lines 1,2 (every 17-20s for approximately 50m)

Lines 4,5,6,7 (every 13s for approximately 50 m)

Acquisition Interval: 2000 microseconds

Record Length: 12s

Compass Birds: no

Tail Buoy Positioning: no

Recording Delay: yes

edu.utexas.ig:rc1903_acq002 (Lines: 3)

Source Information

AirGun

Receiver Information

Hydrophone:Streamer

Used Active Tail Buoy: false

Used Compass Birds: false

Nav System

US Navy Transit Satellite

WGS72

Acquisition System

Digital

Name: DSF IV

(Recording Delay Used)

Details

Receiver Type: Hydrophone_Streamer

Source Type: SeismicSource_Gun_Air Bolt:1500C

Acquisition System Name: DSF IV

Acquisition System Type: digital

Seismic Nav System: US Navy Transit Satellite

Survey Datum: WGS72

Source to Near Channel: about 300m

The near trace offsets in the segy headers vary as shown. There is no explanation.

Line 3 offset 304-305m for shots 43-865

Antenna to Source: 40m

Number of Channels Recorded: 24

Near Channel Number; 24

Channel Length: 100m

Cable Receiver Depth: unknown

Source Volume (cubic inches): 1864

Source Pressure (bars): 138

Source Number: 4

Source Depth: unknown

Shot Control: Time

Shot Interval: Line 3 shot every 17-20s for approximately 50m

Acquisition Interval: 2000 microseconds

Record Length: 12s

Compass Birds: no

Tail Buoy Positioning: no

Recording Delay: yes

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