Results 271 to 280 of about 269,909 (321)

CORRECTION OF ACCURATE GRAVITY SURVEYS BY CAREFULLY OBSERVED VERTICAL GRADIENTS OF GRAVITY*

Geophysical Prospecting, 1972
AbstractGravity surveys in western Texas with station spacing of about 400 m were complemented by carefully observed vertical gradients of gravity making use of specially designed and automated instrumentation. The presented areal surveys of 51 and 52 stations taken in relatively flat terrain are parts of a large survey of close to 1000 stations ...
S THYSSEN‐BORNEMISZA, E. GROTEN, W. O. BAZHAW   +2 more
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The normal vertical gradient of gravity

GEOPHYSICS, 1983
Most gravity surveys are conducted to estimate subsurface density contrasts for one application or another. From large‐scale crustal studies to relatively small exploration surveys, it is necessary to determine in some way what the normal gravity field should be in order to identify anomalous features.
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THE ANOMALOUS VERTICAL GRADIENT OF GRAVITY

GEOPHYSICS, 1970
The behavior of the earth’s vertical gradient of gravity as observed, for example, in tall buildings or boreholes is a matter of considerable geophysical importance. The following elementary considerations may be of interest.
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Prediction of Vertical Gravity Gradients Using Gravity and Elevation Data

2005
The vertical gravity gradients play an important role in the reduction of absolute gravity measurements and in the geoid determination, too. In order to enhance the precision of the gravity reductions and the geoid computations, the difference between the vertical gravity gradient of the real and the normal gravity fields should be taken into account.
Sz. Rózsa, Gy. Tóth
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Interpolation of the vertical deflection from horizontal gravity gradients

Journal of Geophysical Research, 1968
A method is described for the interpolation of deflections of the vertical from horizontal gravity gradients that can be done with considerable accuracy. From the interpolated deflections and astronomic observations, the geodetic coordinated can then be determined.
John Badekas, Ivan I. Mueller
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Some applications of the underground tower gravity vertical gradient

GEOPHYSICS, 1982
Underground tower gravity vertical gradient (UTGVG) measurements made in mine workings have been applied to the detection of caverns, old mine workings, dislocations, and erosive or karstic forms. Since UTGVG measurements are subject to large errors, Kotelnikov’s criterion can be used to determine the probability of isolation of the useful anomalies ...
Zbigniew Fajklewicz, Andrzej Glinski, Janusz Sliz   +2 more
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Investigation of the vertical gradient of gravity

Eos, Transactions American Geophysical Union, 1938
A precise numerical value for the rate at which the acceleration of gravity changes with height at the surface of the Earth is of great importance in geodesy and applied geophysics. This quantity is called the vertical gradient of gravity or in the present paper simply the vertical gradient.The previous determinations of the value of the vertical ...
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Absolute determination of the vertical gradient of gravity

Metrologia, 1999
This paper reports an absolute determination of the vertical gradient of gravity. The result is believed to be the first to achieve a precision comparable with those generally obtained with relative gravity meters. From measurements of time and distance down the trajectory of an object in free fall made with the commercially available absolute gravity ...
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Using absolute gravimeter data to determine vertical gravity gradients

Metrologia, 2001
The position versus time data from a free-fall absolute gravimeter can be used to estimate the vertical gravity gradient in addition to the gravity value itself. Hipkin has reported success in estimating the vertical gradient value using a data set of unusually good quality.
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Magnitude of anomalies in the vertical gradient of gravity

GEOPHYSICS, 1981
The maximum gradient which can be caused by a simple mass is that of a spherical body. The equation for the vertical gradient at the point P above the center of a spherical mass of density contrast σ (see insert on Figure 1) can be written in the form [Formula: see text] where G is the universal gravity constant [Formula: see text] Expressing the ...
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