from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A scar on the earth's surface left from the impact of a meteorite.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun geology A
pit-like structure created by an impacting meteoroid, asteroidor comet.
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
Another earthquake spot is on the north shore of the St. Lawrence River, most interestingly just in a large meteorite impact structure ( "astrobleme") called Charlevoix.
Vredefort Dome, some 120 km southwest of Johannesburg and covering 30,111 ha, is a representative part of a larger meteorite impact structure (or astrobleme), which has a radius of impact of 190 km.
A comprehensive comparative analysis with other complex meteorite impact structures demonstrated that it is the oldest, the largest and the only example on earth providing a full geological profile of an astrobleme below the crater floor, thereby enabling research into the genesis and development of an astrobleme immediately post impact.
It provides the only mappable and restorable profile that illustrates the genesis and development of an astrobleme during the very short time after impact.
Only one astrobleme in Europe fit the description, a crater called the Ries that lay some 300 kilometers to the east, on the northern shore of the Danube River.
The structure called the Ries (or Rieskessel) is the subject of some controversy-one school of thought accepting it as an astrobleme, while another holds it to be the result of a cryptovolcanic explosion that brought to the surface "meteoritelike" materials.
Thus at the final crash, most of those meteoroids fell as one body, to form that gigantic astrobleme.
Her birth country lay not far inland, though sheltered from northerly winds and easterly waters -- the Kazan, Cauldron, huge astrobleme on the continent Rodna, a bowl filled with woods, farmlands, rivers, at its middle Lake Stoyan and the capital Zorkagrad.
Dating back 2,023 million years, it is the oldest astrobleme found on earth so far, with a radius of 190km, it is also the most deeply eroded.
It is the world’s only structurally intact exposure of the basement, below the crater floor, of a very large astrobleme.