Gravity field aspects for identification of cosmic impact structures on Earth

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F22%3A00566815" target="_blank" >RIV/67985815:_____/22:00566815 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61989100:27350/22:10251374

Výsledek na webu

<a href="http://dx.doi.org/10.1130/2021.2553(21)" target="_blank" >http://dx.doi.org/10.1130/2021.2553(21)</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1130/2021.2553(21)" target="_blank" >10.1130/2021.2553(21)</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Gravity field aspects for identification of cosmic impact structures on Earth

Popis výsledku v původním jazyce

We studied the following proven as well as hypothetical impact craters (among others), and some of the relevant results are reviewed in this chapter: (1) a hypothetical impact structure in Saginaw Bay, Great Lakes, Michigan, (2) a putative impact crater basin under the ice of Antarctica in Wilkes Land, (3) two recently discovered subglacial impact craters in Greenland, (4) a possible huge impact crater in Kotuykanskaya in a remote area of Siberia near the proven impact crater Popigai, and (5) a hypothetical impact object Burckle on the bottom of the Indian Ocean. They were tested using the gravity data derived from the recent gravity field model EIGEN 6C4 (with ground resolution of similar to 9 km). Our method is novel, we introduce gravity aspects (descriptors) to augment traditional gravity anomalies. The following gravity aspects were used: (a) gravity disturbances/anomalies, (b) second derivatives of the disturbing potential (the Marussi tensor), (c) two of three gravity invariants, (d) their specific ratio (known as 2D factor), (e) strike angles, and (f) virtual deformations. These gravity aspects are sensitive in various ways to the underground density contrasts. They describe the underground structures (not only the craters) more carefully and in more detail than the traditional gravity anomalies could do alone. Our results support geological evidence of the impact craters found by others in many cases or suggest new impact places for further study.

Název v anglickém jazyce

Gravity field aspects for identification of cosmic impact structures on Earth

Popis výsledku anglicky

We studied the following proven as well as hypothetical impact craters (among others), and some of the relevant results are reviewed in this chapter: (1) a hypothetical impact structure in Saginaw Bay, Great Lakes, Michigan, (2) a putative impact crater basin under the ice of Antarctica in Wilkes Land, (3) two recently discovered subglacial impact craters in Greenland, (4) a possible huge impact crater in Kotuykanskaya in a remote area of Siberia near the proven impact crater Popigai, and (5) a hypothetical impact object Burckle on the bottom of the Indian Ocean. They were tested using the gravity data derived from the recent gravity field model EIGEN 6C4 (with ground resolution of similar to 9 km). Our method is novel, we introduce gravity aspects (descriptors) to augment traditional gravity anomalies. The following gravity aspects were used: (a) gravity disturbances/anomalies, (b) second derivatives of the disturbing potential (the Marussi tensor), (c) two of three gravity invariants, (d) their specific ratio (known as 2D factor), (e) strike angles, and (f) virtual deformations. These gravity aspects are sensitive in various ways to the underground density contrasts. They describe the underground structures (not only the craters) more carefully and in more detail than the traditional gravity anomalies could do alone. Our results support geological evidence of the impact craters found by others in many cases or suggest new impact places for further study.

Druh

C - Kapitola v odborné knize

CEP obor

—

OECD FORD obor

10508 - Physical geography

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název knihy nebo sborníku

In the Footsteps of Warren B. Hamilton: New Ideas in Earth Science

ISBN

978-08-1372-553-6

Počet stran výsledku

10

Strana od-do

251-260

Počet stran knihy

434

Název nakladatele

Geological Society of America

Místo vydání

Boulder

Kód UT WoS kapitoly

000891146500022