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Data Series 264

2006 Compilation of Alaska Gravity Data and Historical Reports

By Richard W. Saltus, Philip J. Brown II, Robert L. Morin, and Patricia L. Hill
CD-ROM implementation and design by Philip J. Brown II

Overview

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Gravity anomalies provide fundamental geophysical information about Earth structure and dynamics. To increase geologic and geodynamic understanding of Alaska, the USGS has collected and processed Alaska gravity data for the past 50 years. This USGS Data Series report introduces and describes an integrated, state-wide gravity database and provides accompanying gravity calculation tools to assist in its application. Additional information includes gravity base station descriptions and digital scans of historical USGS reports. The gravity calculation tools enable the user to reduce new gravity data in a consistent manner for combination with the existing database. This database has sufficient resolution to define the regional gravity anomalies of Alaska. Lack of local isostatic compensation complicates interpretation of regional anomalies in both southern and northern Alaska. However, when filtered appropriately, the Alaska gravity data show regional features with geologic significance. These features include gravity lows caused by low-density rocks of Cenozoic basins, flysch belts, and felsic intrusions, as well as many gravity highs associated with high-density mafic and ultramafic complexes.

This initial release of the integrated Alaska gravity database includes the following components:

A. Report, including historical information, datum description, instructions for use of the gravity reduction tools, and discussion of regional gravity anomalies.
B. Gravity data files
C. Gravity base station descriptions
D. Reference lists for Alaska gravity study reports
E. Historical reports (scanned from original paper copies)
F. Gravity data reduction software tools (based on the Oasis montaj freeware interface)
G. Digital gravity maps

Version 1.0

Posted October 2008

  • Downloads Directory
    The contents of the CD-ROM are compressed a ZIP file for download. This report contains numerous “clickable” hot links and must be installed on your computer. Refer to the README file for further information.
  • Order the CD-ROM from the USGS Store
    From this link, you can order a hard copy by selecting "Purchase Now" (located at the top of the menu bar that is listed down the right side of the page).

Inquiries about this CD-ROM should be addressed to:
Philip J. Brown II
U.S. Geological Survey
Box 25046, Mail Stop 964
Denver Federal Center
Denver, CO 80225-0046
Email: pbrown@usgs.gov

Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.


Suggested citation:

Saltus, R.W., Brown, P.J. II, Morin, R.L., and Hill, P.L., 2008, 2006 compilation of Alaska gravity data and historical reports: U.S. Geological Survey Digital Series 264, CD-ROM.


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