Detection of Earth impact craters aided by the detailed global gravitational model EGM2008

0354962 - ASÚ 2011 RIV CZ eng J - Journal Article
Klokočník, Jaroslav - Kostelecký, J. - Novák, P. - Wagner, C. A.
Detection of Earth impact craters aided by the detailed global gravitational model EGM2008.
Acta geodynamica et geomaterialia. Roč. 7, č. 1 (2010), s. 71-97. ISSN 1214-9705. E-ISSN 2336-4351
R&D Projects: GA MŠMT(CZ) LC506
Grant - others:ESA(XE) ESA-PECS project No.98056
Institutional research plan: CEZ:AV0Z10030501
Keywords : global gravitational model * gravity anomaly * impact craters on the Earth
Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics
Impact factor: 0.452, year: 2010

We have surveyed the Earth's surface using gravity anomalies and second-order radial derivatives of the disturbing gravitational potential computed from the gravitational model EGM2008 complete to degree and order 2159 (for selected degrees up to 2190). It corresponds to 5 arcmin resolution on the ground. Over most well known impact crater sites on the Earth we found the second-order derivatives (not available from ordinary gravity surveys) offered finer discrimination of circular features than the gravity anomalies themselves. We also discovered that some of the sites show evidence of double or multiple craters which will need further ground verification. Some of these signatures (in hilly or mountainous terrain) may also need to be corrected for the gravitational effect of topography to sharpen their hidden features.
Permanent Link: http://hdl.handle.net/11104/0193846