globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2020.228396
论文题名:
Support for two subglacial impact craters in northwest Greenland from Earth gravity model EIGEN 6C4 and other data
作者: Klokočník J.; Kostelecký J.; Bezděk A.; Cílek V.; Kletetschka G.; Staňková H.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 780
语种: 英语
中文关键词: EIGEN 6C4 gravity field model ; Gravity aspects ; Impact crater in Greenland ; Magnetic anomalies
英文关键词: Geology ; Magnetism ; Moon ; Topography ; Comprehensive information ; Earth gravity field models ; Earth gravity models ; Geological features ; Gravity and magnetic anomalies ; Gravity field model ; Greenland ; Magnetic anomalies ; Gravitation ; crater ; gravity anomaly ; gravity field ; gravity survey ; magnetic anomaly ; magnetic field ; subglacial environment ; Arctic ; Greenland
英文摘要: 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. The gravity aspects are, in our case, derived from the recent global static combined Earth gravity field model EIGEN 6C4 with a ground resolution ~9 km and a precision ~10 mGal. A further data come from the digital magnetic field database EMAG 2 with resolution ~5 km. Our method is novel and independent of anything which led to discoveries of these craters in Greenland. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170627
Appears in Collections:气候变化与战略

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作者单位: Astronomical Institute, Czech Academy of Sciences, CZ 251 65 Ondřejov, Fričova, 298, Czech Republic; Research Institute of Geodesy, Topography and Cartography, Zdiby 98, CZ 250 66, Czech Republic; Faculty of Mining and Geology, VSB-TU Ostrava, Ostrava, CZ 708 33, Czech Republic; Faculty of Civil Engineering, Czech Technical Univeristy in Prague, Praha 6, CZ 166 29, Czech Republic; Institute of Geology, Czech Academy of Sciences, Rozvojova 269, Prague, Czech Republic; Department of Applied Geophysics, Charles Univ, Albertov 6, Prague, Czech Republic; Geophysical Institute, University of Alaska Fairbanks, 903 N Koyukuk Drive, Fairbanks, AK, United States

Recommended Citation:
Klokočník J.,Kostelecký J.,Bezděk A.,et al. Support for two subglacial impact craters in northwest Greenland from Earth gravity model EIGEN 6C4 and other data[J]. Tectonophysics,2020-01-01,780
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