Imperial College London

Professor Gareth Collins

Faculty of EngineeringDepartment of Earth Science & Engineering

Professor of Planetary Science
 
 
 
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Contact

 

+44 (0)20 7594 1518g.collins Website

 
 
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Location

 

4.83Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Rae:2017:10.1111/maps.12825,
author = {Rae, A and Collins, GS and Grieve, RAF and Osinki, GR and Morgan, JV},
doi = {10.1111/maps.12825},
journal = {Meteoritics & Planetary Science},
pages = {1330--1350},
title = {Complex crater formation: Insights from combining observations of shock pressure distribution with numerical models at the West Clearwater Lake impact structure},
url = {http://dx.doi.org/10.1111/maps.12825},
volume = {52},
year = {2017}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - Large impact structures have complex morphologies, with zones of structural uplift that can be expressed topographically as central peaks and/or peak rings internal to the crater rim. The formation of these structures requires transient strength reduction in the target material and one of the proposed mechanisms to explain this behavior is acoustic fluidization. Here, samples of shock-metamorphosed quartz-bearing lithologies at the West Clearwater Lake impact structure, Canada, are used to estimate the maximum recorded shock pressures in three dimensions across the crater. These measurements demonstrate that the currently-observed distribution of shock metamorphism is strongly controlled by the formation of the structural uplift. The distribution of peak shock pressures, together with apparent crater morphology and geological observations, is compared with numerical impact simulations to constrain parameters used in the block-model implementation of acoustic fluidization. The numerical simulations produce craters that are consistent with morphological and geological observations. The results show that the regeneration of acoustic energy must be an important feature of acoustic fluidization in crater collapse, and should be included in future implementations. Based on the comparison between observational data and impact simulations we conclude that the West Clearwater Lake structure had an original rim (final crater) diameter of 35–40 km and has since experienced up to ~2 km of differential erosion.
AU - Rae,A
AU - Collins,GS
AU - Grieve,RAF
AU - Osinki,GR
AU - Morgan,JV
DO - 10.1111/maps.12825
EP - 1350
PY - 2017///
SN - 1086-9379
SP - 1330
TI - Complex crater formation: Insights from combining observations of shock pressure distribution with numerical models at the West Clearwater Lake impact structure
T2 - Meteoritics & Planetary Science
UR - http://dx.doi.org/10.1111/maps.12825
UR - http://hdl.handle.net/10044/1/43147
VL - 52
ER -