Transient Crater Formation and Collapse: Observations at the Haughton Impact Structure, Arctic Canada

Details Transient Crater Formation and Collapse: Observations at the Haughton Impact Structure, Arctic Canada Transient Crater Formation and Collapse: Observations at the Haughton Impact Structure, Arctic Canada

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icbg.conf...58o&link_type=abstract

Impact Cratering: Bridging the Gap Between Modeling and Observations, p. 58

Mathematics

Logic

Transient Loads, Cratering, Collapse, Mathematical Models, Tectonics, Morphology, Excavation, Depth, Arctic Regions

Scientific paper

It is generally believed that the processes involved in the formation of an initial transient crater and its subsequent excavation, are common for all craters, regardless of their size. A critical assumption is that the depth/diameter ratio of a transient crater remains constant for any given crater size. The morphological diversity of impact structures is, therefore, attributed to the modification or collapse of an initial simple hemispherical transient crater. The mechanisms of impact crater collapse remain one of the least understood stages in the impact cratering process. Indeed, standard strength models used in conventional hydrocode modeling techniques are not successful in describing crater collapse. Numerical models have also rarely been constrained by field data from terrestrial impact structures. This is, however, a catch-22 situation because very few detailed field investigations of the tectonics of complex impact structures have been made. Here, we present new constraints on the formation of complex impact craters based on detailed field studies of the Haughton impact structure, Arctic Canada.

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