ALASKA, U.S. NON-EXCLUSIVE GRAVITY & MAGNETIC INFORMATION

Alaska Peninsula Data Integration

Data

• Survey Size: Approximately 7,000 square miles; 1,609 helicopter stations from EDCON's Bristol Bay Survey, 908 stations from the USGS gravity data base, 3,013 helicopter stations from the Strata Search survey
• Data Spacing: Variable
• Terrain Corrections: Through Hayford-Bowie Zone J
• Project Summary: USGS stations have been terrain-corrected and integrated with the EDCON and Strata Search data. If Strata Search data are not owned, the EDCON/USGS data are available as a separate integrated package. Editing performed during hand-contouring has produced high-quality Bouguer gravity maps.
• Data Provided:
  Bouguer Gravity Map (scale 1:96,000): Gravity data are tied to the Worldwide Defense Mapping Agency base station gravity network.
  Magnetic tape and computer printout containing all principal survey facts including: station number, date surveyed, latitude, longitude, UTM X-coordinate, UTM Y-coordinate, elevation, terrain correction, station gravity, free-air gravity and Bouguer gravity calculated with three densities
  Report
• Prerequisites: Ownership of EDCON and Strata Search data. Companies that do not own both data sets may participate in the integration and receive the portion of the integrated maps and tapes over areas owned.
• Cost: $12,500 for three data sets merged; $10,000 for EDCON/USGS merge only

Alaska Peninsula Map: 83K jpeg file

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Aleutian Islands, Alaska Helicopter Gravity Survey

Data

• Survey Size: 5,200 square miles, 250 stations
• Data Spacing: Variable, acquired using helicopter-supported inertial surveying
• Terrain Corrections: Through Hayford-Bowie Zone J
• Data Provided:
  Maps (scale 1:250,000): Bouguer Gravity Map. Gravity data are tied to the Worldwide Defense Mapping Agency base station gravity network.
  Magnetic tape and computer printout containing all principal survey facts including: station number, date surveyed, latitude, longitude, UTM X-coordinate, UTM Y-coordinate, elevation, terrain correction, station gravity, free-air gravity, and Bouguer gravity
  Report
• Total Cost: $25,000
• Cost/Station: $100/station

Aleutian Islands Map: 98K jpeg file

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Amak Basin, Alaska Marine Gravity & Magnetic Survey

Data

• Survey Size: 1,368 line miles
• Line Spacing: Variable
• Data Provided:
  Maps (scale 1:500,000): Bathymetry
  Profiles at seismic scale: observed gravity, free-air gravity, processed gravity, Bouguer gravity, Eötvös correction, total magnetic intensity with the Earth's field removed
  Magnetic Tape: one-minute samples of observed and processed data
• Cost: Seismic data available from GSI: Gravity - $8.00/line mile; Magnetic - $4.00/line mile
• Total Cost: $16,416

Amak Basin Map: 63K jpeg file

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Beaufort Sea Coastal Survey, Alaska Helicopter Gravity Survey

Data

• Survey Size: 119 gravity stations acquired by helicopter using inertial surveying
• Data Spacing: Data were acquired at variable intervals along the coast from the Canadian border to the Canning River
• Terrain Corrections: Through Hayford-Bowie Zone J
• Data Provided:
  Magnetic tape and computer printout containing all principal survey facts including: station number, date surveyed, latitude, longitude, UTM X-coordinate, UTM Y-coordinate, elevation, terrain correction, station gravity, free-air gravity and Bouguer gravity calculated for three densities
  Report describing data acquisition and reduction
  Bouguer Gravity Map at a scale of 1" = 8,000'; station location map. Gravity data are tied to the Worldwide Defense Mapping Agency base station gravity network.
• Total Cost: $11,900
• Cost/Station: $100

Beaufort Sea Coastal Survey Map: 153K jpeg file

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Beaufort Sea Ice, Alaska Helicopter-Supported Gravity Survey

Data

• Survey Size: 8 profiles, 386 gravity stations acquired by helicopter using inertial surveying; 352 stations on the Beaufort Sea ice, 34 stations on land
• Data Spacing: Data were acquired at 3-mile intervals along 8 profiles; spacing between profiles varies from 20 to 70 miles
• Complete Bouguer Corrections: Three-dimensional Bouguer correction applied
• Data Provided:
  Magnetic tape and computer printout containing all principal survey facts including: station number, date surveyed, latitude, longitude, UTM X-coordinate, UTM Y-coordinate, elevation, 3-D Bouguer correction, station gravity, free-air gravity and Bouguer gravity calculated for three densities
  Station location map, hand-contoured Bouguer map of profile data and computer-contoured Bouguer map including 100 stations of public data (Map Scale; 1:500,000)
  Report describing data acquisition and reduction
  Gravity data are tied to the Worldwide Defense Mapping Agency base station gravity network.
• Total Cost: $65,000
• Cost/Station: Ice Stations: $175; Land Stations: $100

2-Dimensional Gravity Interpretation

• Data Provided:
  Interpretive profiles showing: faults, depth to high-density basement, other tectonic features
  Features traceable between profiles are summarized on an interpretation map. Complete report discussing methods and results of interpretation
• Interpretation Cost: $1,500 per profile; $12,000 total

Beaufort Sea Ice Map: 174K jpeg file

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Bristol Bay, Alaska Helicopter Gravity Survey

Data

• Survey Size: 2,400 square miles; 1,600 stations
• Data Spacing: ½ mile intervals on lines 3 miles apart, acquired using helicopter-supported inertial surveying
• Terrain Corrections: Through Hayford-Bowie Zone J
• Data Provided:
  Bouguer Gravity Map (scale 1:96,000): Gravity data are tied to the Worldwide Defense Mapping Agency base station gravity network.
  Magnetic tape and computer printout containing all principal survey facts including: station number, date surveyed, latitude, longitude, UTM X-coordinate, UTM Y-coordinate, elevation, terrain correction, station gravity, free-air gravity and Bouguer gravity
  Report
• Cost: $137,800
• Cost/Station: $86.13 per station

Bristol Bay Map: 83K jpeg file

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Chukchi Sea, Alaska: 1982-1985 Marine Gravity & Magnetic Survey

Data

• Survey Size: Total Gravity - 12,980 line miles; Total Magnetic - 10,496 line miles
  Acquired 1982: Gravity - 3,925 line miles; Magnetic - 4,412 line miles
  Acquired 1983: Gravity - 2,356 line miles; Magnetic - 2,104 line miles
  Acquired 1984: Gravity - 3,237 line miles; Magnetic - 2,475 line miles
  Acquired 1985: Gravity - 3,461 line miles; Magnetic - 1,235 line miles
• Line Spacing: Variable
• Data Provided:
  Maps (scale 1:250,000): Bathymetry, Observed and Processed Gravity, Eötvös Correction, Total Magnetic Intensity, Base Station Magnetics
  Magnetic Tape: one-minute samples of observed and processed data, including navigation
  Notes: Data acquired in 1982-1984 have been reprocessed and integrated with the 1985 data. Seismic data available from GSI
• Cost:
  $16.00/line mile
  If data set is already owned, reprocessing available at $4.00/line mile
  15% discount for purchase of more than 5,000 miles; 25% discount for purchase of entire data set

1982-84 data acquired by GSI; 1985 data acquired by EDCON

1982-1985 Chukchi Sea Map: 127K jpeg file

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Chukchi Sea, Alaska: 1984 Marine Gravity & Magnetic Survey

Data

• Survey Size: 6,993 line kilometers
• Line Spacing: Variable from 3 to 16 kilometers
• Survey Date: 1984
• Data Provided:
  Maps (scale 1:250,000): Free-Air Gravity, Bouguer Gravity, Bathymetry, Total Magnetic Intensity
  Profiles at seismic scale (1:31,680): observed gravity, free-air gravity, two-dimensionally terrain-corrected Bouguer gravity, base station magnetics, corrected magnetics, Eötvös correction, water depth
  Magnetic Tape: one-minute samples of observed and processed data, including navigation
  Report
• Cost: $86,500 (Ownership of the 1984 Digicon Seismic Survey is a prerequisite for purchase.)

Interpretation

• Data Provided:
  Maps (scale 1:250,000): Regional Gravity, Residual Gravity, Second Vertical Derivative of Bouguer Gravity, Depth to High-Density Basement, Second Vertical Derivative of Total Magnetic Intensity, Magnetic Interpretation, Tectonic Interpretation
  Structural and tectonic interpretation of basement and sedimentary structure based on gravity, magnetic and available geologic information
  Report
• Cost: Included with purchase of data

Chukchi Sea Map: 73K jpeg file

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Chukchi Sea, Alaska: 1985 Barrow Arch Marine Gravity & Magnetic Survey

Data

• Survey Size: 4,453 line kilometers
• Line Spacing: Variable
• Survey Date: 1985
• Data Provided:
  Maps: Free-Air Gravity, Bouguer Gravity, Bathymetry, Total Magnetic Intensity
  Profiles at seismic scale (1:31,680): observed gravity, free-air gravity, two-dimensionally terrain-corrected Bouguer gravity, base station magnetics, corrected magnetics, Eötvös correction, water depth
  Magnetic Tape: one-minute samples of observed and processed data, including navigation

Interpretation

• Data Provided:
  Maps (scale 1:250,000): Regional Gravity, Residual Gravity, Second Vertical Derivative of Bouguer Gravity, Depth to High-Density Basement, Second Vertical Derivative of Total Magnetic Intensity, Magnetic Interpretation, Tectonic Interpretation
  Structural and tectonic interpretation of basement and sedimentary structure based on gravity, magnetic and available geologic information
  Report
• Cost:
  $73,400 for 1985 data without interpretation (2,766 miles)
  $171,700 for integrated and interpreted 1984 and 1985 data (7,109 miles)
  1984 data (4,343 miles) available with interpretation for $86,500
• Condition of Sale: Ownership of the Digicon Seismic Survey is a prerequisite of purchase

These data were acquired by EDCON aboard Digicon vessels.

1985 Chukchi Sea Map: 89K jpeg file

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Gulf of Alaska (NOAA data) Marine Gravity & Magnetic Survey

Data

• Survey Size: 9,200 line miles
• Data Spacing: 5 x 20 mile grid
• Data Provided:
  Water Depth Map
  Free-Air Gravity Map
  Magnetic Anomaly Map
  Terrain-Corrected Bouguer Gravity
  Report discussing methods and results
  (Map scale for all maps: 1" = 16,000')
• Total Cost: $8,000

Interpretation

• Data Provided:
  Area east of 147° and north of 59°: Regional Magnetic Basement Map showing regional plate boundaries, major strike-slip faults, location of intrasedimentary magnetic material, gravity trend locations; Report discussing methods and results of interpretation
  Area west of Kayak Island: Gravity Derived Basement Map; Report discussing methods and results of interpretation
• Total Cost: $11,000
• Conditions of Sale: Purchase of data prerequisite for purchase of interpretation

Gulf of Alaska Map: 87K jpeg file

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Holitna Basin, Alaska Helicopter Gravity Survey

Data

• Survey Size: 1,150 stations acquired using inertial surveying
• Data Spacing: Data were acquired at one-mile intervals along lines spaced six miles apart
• Terrain Correction: Through Hayford-Bowie Zone J
• Data Provided:
  Magnetic tape and computer printout containing all principal survey facts including: station number, date surveyed, latitude, longitude, UTM X-coordinate, UTM Y-coordinate, elevation, terrain correction, station gravity, free-air gravity and Bouguer gravity calculated for three densities
  Report describing data acquisition and reduction
  Bouguer Gravity Map at a scale of 1" = 8,000'. Gravity data are tied to the Worldwide Defense Mapping Agency base station gravity network.
• Total Cost: $115,000
• Cost/Station: $100/station

Integrated Gravity/Geologic Structural Interpretation

• Data Provided:
  Interpretation Map showing: Faults, structural axes, petroleum prospects, edges of thrust faults, low density isopach contours
  Second Vertical Derivative Map
  Cross-sections showing gravity and geology
  Complete report discussing methods and results of interpretation
• Interpretation Cost: Price upon request

Holitna Basin Map: 107K jpeg file

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Hope Basin, Alaska Marine Gravity Survey

Data

• Survey Size: 3,650 line miles
• Line Spacing: Variable
• Data Provided:
  Maps (scales 1:250,000 and 1:500,000): Bouguer Gravity
  Profiles at seismic scale showing: observed gravity, free-air gravity, processed gravity, Eötvös correction
  Magnetic Tape: one-minute samples of observed and processed data
• Cost: $8.00 per line mile
• Total Cost: $29,200

Seismic data available from GSI

Hope Basin Map: 63K jpeg file

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Kodiak Shelf, Alaska Marine Gravity / Magnetic / Seismic Survey

Data

• Survey Size: 5,722 line miles
• Data Spacing: 3 mile x 4 mile primary grid
• Data Provided:
  Profiles at seismic scale showing: free-air gravity, adjusted free-air gravity, two-dimensionally terrain-corrected Bouguer gravity, total magnetic intensity with Earth's normal field removed, Eötvös correction, water depth, recording time fiducials, seismic shot point fiducials, misties, and adjustments
  Machine-Contoured Free-Air Gravity Map
  Simple Bouguer Gravity Map
  Bathymetry Map
  Total Magnetic Intensity Map with Earth's normal field removed
• Total Cost: Quote available upon request

Integrated Gravity/Magnetic/Seismic Geologic Structural Interpretation

• Data Provided:
  Option A: Terrain-corrected hand-contoured maps including: Bouguer Gravity, Total Magnetic Intensity, Bathymetry
  Option B: Depth to Economic Basement Map, Basement Density and Susceptibility Map, Filtered magnetic maps: Magnetic Field Reduced-to-Pole, Second Vertical Derivative of Magnetic Field; Report discussing procedures and results of interpretation
• Interpretation Cost: Option A - $3,500 Option B - $10,000
• Conditions of Sale: Purchase of Option A prerequisite for purchase of Option B

Kodiak Shelf Map: 76K jpeg file

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Kodiak and Aleutian Shelf Marine Gravity / Magnetic / Seismic Survey

Data

• Survey Size: 6,367.06 line miles
• Data Spacing: 3 mile x 4 mile primary grid
• Data Provided:
  Profiles at seismic scale showing: free-air gravity, adjusted free-air gravity, two-dimensionally terrain-corrected Bouguer gravity, total magnetic intensity with Earth's normal field removed, Eötvös correction, water depth, recording time fiducials, seismic shotpoint fiducials, misties, and adjustments
  Machine-Contoured Free-Air Gravity Map
  Simple Bouguer Gravity Map
  Bathymetry Map
  Total Magnetic Intensity Map with Earth's normal field removed
• Total Cost: Quote available upon request

Integrated Gravity / Magnetic / Seismic Geologic Structural Interpretation

• Data Provided:
  Option A: Terrain-corrected hand-contoured maps including: Bouguer Gravity, Total Magnetic Intensity, Bathymetry
  Option B: Depth to Economic Basement Map, Basement Density and Susceptibility Map, Filtered magnetic maps: Magnetic Field Reduced-to-Pole, Second Vertical Derivative of Magnetic Field; Report discussing procedures and results of interpretation
• Interpretation Cost: Option A - $4,138.59; Option B - $9,550.59
• Cost/Mile: Option A - $.65/mile; Option B - $1.50/mile
• Conditions of Sale: Purchase of Option A prerequisite for purchase of Option B

Kodiak & Aleutian Shelf Map: 99K jpeg file

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Navarin Basin, Alaska Marine Gravity & Magnetic Survey

Data

• Survey Size: 2,234 line miles
• Line Spacing: Variable
• Data Provided:
  Profiles at seismic scale showing: observed gravity, free-air gravity, processed gravity, Bouguer gravity, Eötvös correction, total magnetic intensity with the Earth's field removed
  Magnetic Tape: one-minute samples of observed and processed data
• Cost: Gravity - $8.00/line mile; Magnetic - $4.00/line mile
• Total Cost: $26,808
• Seismic data available from GSI

Navarin Basin Map: 35K jpeg file

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North Aleutian Shelf, Alaska Marine Gravity & Magnetic Survey

Data

• Survey Size: 4,179 line miles
• Line Spacing: Variable
• Data Provided:
  Maps (scale 1:250,000): Free-Air Gravity, Bouguer Gravity, Bathymetry
  Profiles at seismic scale: free-air gravity, adjusted free-air gravity, observed gravity, filtered Bouguer gravity, Eötvös correction, total magnetic intensity with the Earth's normal field removed
• Cost: Gravity - $8.00/line mile; Magnetic - $4.00/line mile
• Total Cost: $50,148
• Seismic data available through GSI

North Aleutian Islands Map: 39K gif file

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North Chukchi Sea Ice Helicopter-Supported Gravity Survey

Data

• Survey Size: Eight profiles, 517 gravity stations acquired by helicopter using inertial surveying; 512 stations on the North Chukchi Sea Ice, 5 stations on land
• Data Spacing: Data were acquired at 3-mile intervals along 8 profiles spaced 40 miles apart
• Survey Date: Spring 1986
• Complete Bouguer Correction: Three-dimensional Bouguer correction applied
• Data Provided:
  Maps (scale 1:500,000): Station Location Map, hand-contoured Bouguer Map of profile data and computer-contoured Bouguer Map
  Magnetic tape and computer printout containing all principal survey facts including: station number, date surveyed, latitude, longitude, UTM X-coordinate, UTM Y-coordinate, elevation, terrain correction, station gravity, free-air gravity, and Bouguer gravity calculated for three densities
  Gravity data are tied to the Worldwide Defense Mapping Agency base station gravity network.
  Report
• Total Cost: $153,000
  Quotes will be made for partial purchases
  Beaufort Sea Ice Survey: Cost, $65,000; Details in EDCON's 1984 Data and Interpretations Supplement.

North Chukchi Sea Ice Map: 97K jpeg file

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Southern National Petroleum Reserve, Alaska (NPR-A) Helicopter Gravity Survey

Data

• Survey Size: 5,000 square miles; approximately 4,000 stations acquired by helicopter with inertial surveying; approximately 10,000 stations (public data)
• Data Spacing: 5,900 foot grid
• Terrain Corrections: Through Hayford-Bowie Zone J
• Data Provided:
  Magnetic tape and computer printout containing all principal survey facts including: station number, date surveyed, latitude, longitude, UTM X-coordinate, UTM Y-coordinate, elevation, terrain correction, station gravity, free-air gravity, and Bouguer gravity calculated for three densities
  Both the helicopter-acquired data and the publicly available data have been terrain corrected and integrated
  Report describing data acquisition and reduction
  Bouguer Gravity Map at a scale of 1" = 8,000'; station location map. Gravity data are tied to the Worldwide Defense Mapping Agency base station gravity network.
• Total Cost: $280,000

Interpretation

• Available upon request

NPRA Map: 143K jpeg file

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