气候变化领域集成服务门户(CCPortal): Support for two subglacial impact craters in northwest Greenland from Earth gravity model EIGEN 6C4 and other data

CCPortal

DOI	10.1016/j.tecto.2020.228396
	Support for two subglacial impact craters in northwest Greenland from Earth gravity model EIGEN 6C4 and other data
	Klokočník J.; Kostelecký J.; Bezděk A.; Cílek V.; Kletetschka G.; Staňková H.
发表日期	2020
ISSN	00401951
卷号	780
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.
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
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207794
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
推荐引用方式 GB/T 7714	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],2020,780.
APA	Klokočník J.,Kostelecký J.,Bezděk A.,Cílek V.,Kletetschka G.,&Staňková H..(2020).Support for two subglacial impact craters in northwest Greenland from Earth gravity model EIGEN 6C4 and other data.Tectonophysics,780.
MLA	Klokočník J.,et al."Support for two subglacial impact craters in northwest Greenland from Earth gravity model EIGEN 6C4 and other data".Tectonophysics 780(2020).