Mathematics – Logic
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992rvgeo..30..161p&link_type=abstract
Reviews of Geophysics (ISSN 8755-1209), vol. 30, no. 2, May 1992, p. 161-181.
Mathematics
Logic
125
Gravity Anomalies, Hypervelocity Impact, Magnetic Signatures, Meteorite Craters, Breccia, Geological Surveys, Magnetic Anomalies
Scientific paper
Terrestrial impact craters are examined in terms of their geophysical characteristics which can be used to identify additional impact craters. The geophysical signatures examined include the circular gravity low which is modeled for the cases of bowl-shaped and complex craters. The size of the gravity anomaly for both types of craters is established and modeled with known morphometric parameters of impact structures. The gravity anomaly varies directly with crater diameter and reaches a maximum at about 20-30 mGal at diameters of 20-30 km. The magnetic signatures of the craters are found to vary primarily according to the reduction in susceptibility, and crater structures with diameters of more than 40 km show central high-amplitude anomalies. Seismic techniques such as reflection surveys demonstrate that the subsurface structures of the craters are dominated by brecciation and fracturing. The criteria developed in this study can be employed to evaluate the possibilities that various geophysical anomalies are due to impact.
Grieve Richard A. F.
Pilkington Mark
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