System and method for surveying underground density distributions
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United States of America Patent
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Oct 11, 2005
Grant Date -
Jan 1, 2004
app pub date -
Jun 27, 2003
filing date -
Jun 28, 2002
priority date (Note) -
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Abstract
A method for geographical surveying includes the steps of determining an observation grid comprising observation points above a solution volume in the ground; making gravitational measurements at the observation points over a survey area; compiling a matrix having elements relating a set of gravitational accelerations and gravity gradient values at the points to the mass values for volume elements in the solution volume; and calculating the three-dimensional density distribution of the volume under the survey area based on the gravitational measurements and the inverse of the matrix. By measuring the magnetic field and gradient at the observation points, the three-dimensional magnetic susceptibility distribution of the volume under the survey area can be determined.
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