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@article{Elbeshausen:2013:10.1002/2013JE004477,
author = {Elbeshausen, D and Wünnemann, K and Collins, GS},
doi = {10.1002/2013JE004477},
journal = {Journal of Geophysical Research: Planets},
pages = {22952309--22952309},
title = {The transition from circular to elliptical impact craters},
url = {http://dx.doi.org/10.1002/2013JE004477},
volume = {118},
year = {2013}
}
TY - JOUR
AB - Elliptical impact craters are rare among the generally symmetric shape of impact structures on planetary surfaces. Nevertheless, a better understanding of the formation of these craters may significantly contribute to our overall understanding of hypervelocity impact cratering. The existence of elliptical craters raises a number of questions: Why do some impacts result in a circular crater whereas others form elliptical shapes? What conditions promote the formation of elliptical craters? How does the formation of elliptical craters differ from those of circular craters? Is the formation process comparable to those of elliptical craters formed at subsonic speeds? How does crater formation work at the transition from circular to elliptical craters? By conducting more than 800 three-dimensional (3-D) hydrocode simulations, we have investigated these questions in a quantitative manner. We show that the threshold angle for elliptical crater generation depends on cratering efficiency. We have analyzed and quantified the influence of projectile size and material strength (cohesion and coefficient of internal friction) independently from each other. We show that elliptical craters are formed by shock-induced excavation, the same process that forms circular craters and reveal that the transition from circular to elliptical craters is characterized by the dominance of two processes: A directed and momentum-controlled energy transfer in the beginning and a subsequent symmetric, nearly instantaneous energy release.
AU - Elbeshausen,D
AU - Wünnemann,K
AU - Collins,GS
DO - 10.1002/2013JE004477
EP - 2309
PY - 2013///
SN - 2169-9100
SP - 2295
TI - The transition from circular to elliptical impact craters
T2 - Journal of Geophysical Research: Planets
UR - http://dx.doi.org/10.1002/2013JE004477
UR - http://onlinelibrary.wiley.com/doi/10.1002/2013JE004477/abstract
VL - 118
ER -