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A giant impact crater beneath the Wilkes Land ice sheet was first proposed by Richard A. Schmidt in 1962 on the basis of the seismic and gravity discovery of the feature made by the U.S. Victoria Land Traverse in 1959–60 (VLT), and the data provided to Schmidt by John G. Weihaupt, geophysicist of the VLT (Geophysical Studies in Victoria Land, Antarctica, Report No. 1, Geophysical and Polar ...
English: Free-air gravity anomaly from Earth Gravitational Model EGM2008. The gravity anomaly is the difference between the measured gravity and the normal gravity. The difference is given in the unit milligal (mGal) equal to 10-5 m/s 2.
The magnetic anomalies Bangui and Jackpine Creek, [145] the gravity anomalies Wilkes Land crater and Falkland Islands, [350] and others have been considered as being of impact origin. Bangui apparently has been discredited, [ 25 ] [ 351 ] but appears again in a 2014 table of unconfirmed structures in Africa by Reimold and Koeberl.
A gravity map is a map that depicts gravity measurements across an area of space, which are typically obtained via gravimetry. Gravity maps are an extension of the field of geodynamics. Readings are typically taken at regular intervals for surface analysis on Earth. [1] Other methods include analysis of artificial satellite orbital mechanics ...
The gravity anomaly at a location on the Earth's surface is the difference between the observed value of gravity and the value predicted by a theoretical model. If the Earth were an ideal oblate spheroid of uniform density, then the gravity measured at every point on its surface would be given precisely by a simple algebraic expression.
The Gravity Recovery and Climate Experiment (GRACE) was a joint mission of NASA and the German Aerospace Center (DLR). Twin satellites took detailed measurements of Earth's gravity field anomalies from its launch in March 2002 to the end of its science mission in October 2017.
EGM96 also included altimeter derived anomalies derived from ERS-1 by Kort & Matrikelstyrelsen (KMS), (National Survey and Cadastre, Denmark) over portions of the Arctic, and the Antarctic, as well as the altimeter derived anomalies of Schoene [1996] over the Weddell Sea. The raster from EGM96 is provided at 15'x15' resolution.
In marine gravity surveys, it was observed that the free-air anomaly is positive but very small over the Mid-Ocean Ridges in spite of the fact that these features rise several kilometers above the surrounding seafloor. [6] The small anomaly is explained by the lower density crust and mantle below the ridges resulting from seafloor spreading ...