USGS -- Scientific Capabilities -- Geophysical Analyses


 

Geophysical analyses encompass a broad range of studies and techniques that seek to image the region beneath the surface of the Earth by means of the interpretation of physical parameters, waves, or fields measured at the Earth's surface. Physical quantities commonly measured include gravitational acceleration, geomagnetic field, rock magnetism, electrical conductivity, electromagnetic fields from both natural or manmade sources, seismic waves from explosions or earthquakes, heat flow, and many others. Because most individual geophysical techniques provide fuzzy or ambiguous images of the subsurface, effective interpretations are commonly based on a number of techniques used in tandem.

The Mineral Resource Program (MRP) maintains capabilities in remote sensing, imaging spectroscopy, gravity, magnetic, electrical, electromagnetic, gamma-ray, magnetotelluric, and ground-penetrating radar techniques. These methods are applied in mineral resource, mineral environmental, and general geologic investigations.

The Geophysical Unit in Menlo Park (GUMP) has members who specialize in gravity, magnetic, electrical, electromagnetic, and paleomagnetic techniques applied to the solution of geologic problems. Gravity and magnetic techniques are effective in urban or other developed areas, places where many important problems are encountered but where many geologic and geophysical methods are rendered ineffective due to cultural "noise".

Geophysical databases

Aeromagnetic--Efforts are being made to archive on CD-ROM all the digitized aeromagnetic data from early analog surveys that have been used in various whole state compilations. Target date for release to the public is January 2000. A reference database containing all the specifications for most public domain airborne geophysical surveys has been established. It is currently being annotated to show which surveys have been digitized. Whole state aeromagnetic maps have been compiled for many of the western states. It is expected they will be released on the World Wide Web before the end of 1998.

Selected Bibliography

Bibliographies and location maps of selected publications containing airborne geophysical data are available as Open-File Reports 91-370-A through F. Most states have been updated and draft copies of individual states can be obtained for internal use only.

General Contact:

Victor F. Labson
USGS, MS 964
Denver Federal Center
Denver, CO 80225
(303) 236-1312

vlabson@usgs.gov

GEO-CRG-MRS

Regional and Geologic Expertise

Alaska -- Morin, Saltus, Kulik, Campbell
Antarctica -- Finn
Arizona -- Gettings, Finn, Phillips
Northern California --J achens
Southern California -- Langenheim
Colorado -- Bankey, Campbell
Eastern States -- Daniels, Snyder
Florida -- Fitterman
Hawaii -- Hildenbrand
Idaho -- Bankey, McCafferty
Mid-continent -- Hildenbrand, Daniels,
Phillips
Montana -- McCafferty, Bankey
Nevada -- Ponce, Grauch, Saltus
New Mexico -- Grauch
Pacific Northwest -- Blakely, Finn, Blank
Utah - Bankey, Campbell
Wyoming -- Kucks, Finn

Process Expertise

Basin analysis -- Ponce, Saltus, Phillips,
Grauch
Earthquake related processes -- Hildenbrand
Ground water studies -- Langenheim,
Grauch, Fitterman, Lucius, Powers, Horton,
Campbell, Bisdorf
Mineral resources -- Jachens, Daniels, Saltus,
Bankey, Wynn, Grauch, Gettings,
McCafferty, Smith, Duval, Kulik, Blank,
Kleinkopf, Phillips, Knepper, Livo, Rowan,
Crowley
Mineral environmental studies -- McCafferty,
Campbell, Knepper, Livo, Swayze, Clark,
King, Kolaly, Rowan, Crowley
Plate tectonics -- Blakely
Volcano-related processes -- Blakely, Finn

 

 

  • REMOTE SENSING
Terrestrial Remote Sensing
Mini Image Processing

Aviris
Imaging Spectroscopy Lab
Contacts
  • SATELLITE MAPPING
    INTERFEROMETRY
Technique
Equipment
Contacts
  • GRAVITY
Technique
Equipment
Contacts
  • MAGNETIC
Technique
Equipment
Contacts
 
  • GROUND PENETRATING RADAR
Technique
Equipment
Contacts
  • SURFACE INDUCED POLARIZATION
Technique
Equipment
Contacts
  • GAMMA-RAY
Technique
Equipment
Contacts

 

  • ELECTRICAL GEOPHYSICAL
    DATA-ACQUISITION SYSTEM
Technique
Equipment
Contacts
  • ELECTRICAL AND ELECTROMAGNETIC
Technique
Equipment
Contacts
Airborne EM
Technique
Equipment
Contacts
 
Marine Electromagnetic
Technique
Equipment
Contacts
 
Surface Electromagnetic
Technique
Equipment
Contacts
 
Borehole EM
Technique
Equipment
Contacts

Electromagnetic Laboratory
Technique
Equipment
Contacts

Electromagnetic Theory
Technique
Equipment
Contacts
  • MAGNETOTELLURICS
Technique
Equipment
Contacts
 

 


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URL http://geology.cr.usgs.gov/capabilities/geoanal.html