Support for two subglacial impact craters in northwest Greenland from Earth gravity model EIGEN 6C4 and other data

0534183 - ASÚ 2021 RIV NL eng J - Článek v odborném periodiku
Klokočník, Jaroslav - Kostelecký, J. - Bezděk, Aleš - Kletetschka, Günther - Cílek, Václav - Staňková, H.
Support for two subglacial impact craters in northwest Greenland from Earth gravity model EIGEN 6C4 and other data.
Tectonophysics. Roč. 780, April (2020), č. článku 228396. ISSN 0040-1951. E-ISSN 1879-3266
Grant CEP: GA MŠMT(CZ) LTT18011
Grant ostatní: GA MŠk(CZ) LO1506
Institucionální podpora: RVO:67985815 ; RVO:67985831
Klíčová slova: impact crater in Greenland * gravity aspects * EIGEN 6C4 gravity field model
Obor OECD: Physical geography; Physical geography (GLU-S)
Impakt faktor: 3.933, rok: 2020
Způsob publikování: Omezený přístup
https://doi.org/10.1016/j.tecto.2020.228396

We support the very recent discovery of two impact craters under the ice of northwest Greenland (Hiawatha Glacier and Paterson). These discoveries are based mainly on geology and bedrock topography. We added an analysis of gravity field aspects (descriptors) in addition to the traditional gravity and magnetic anomalies. The gravity aspects (the Marussi tensor of the second derivatives, the gravity invariants and their special ratio, strike angles and virtual deformations) provide more complex and comprehensive information about the underground density variations due to a causative body than ordinary gravity anomalies. They show signals typical for the individual geological features like a mountain/volcano, fault, (river)valley, (paleo)lake, (ground)water, hydrocarbon/mineral deposits, etc., as well as for the targets known as impact craters. Our method has been tested on various geological features on the Earth and the Moon.
Trvalý link: http://hdl.handle.net/11104/0312410