Numerical simulations of the Mjølnir marine impact crater

Details Numerical simulations of the Mjølnir marine impact crater Numerical simulations of the Mjølnir marine impact crater

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgre..107.5047s&link_type=abstract

Journal of Geophysical Research (Planets), Volume 107, Issue E7, pp. 1-1, CiteID 5047, DOI 10.1029/2001JE001698

Physics

Geophysics

16

Mathematical Geophysics: Modeling, Mathematical Geophysics: Numerical Solutions, Planetary Sciences: Impact Phenomena (Includes Cratering)

Scientific paper

The 40-km-diameter Mjølnir crater in the Barents Sea was created by a meteoroid impact into a 400 m shallow sea about 142 Ma. We have used a multimaterial hydrocode with depth-depending target strength to model numerically the cratering and early modification stages of the Mjølnir impact. Our models are constrained by the observed crater morphology and structure. The best results were obtained for a composite target strength structure: very low strength for the upper 3 km of sedimentary rocks and gradual increase from 3 to 6.5 km depth before using strength values typical for granitic rocks at greater depths. The low strength of the target sediments at shallow depths led to exceptionally intensive slumping and gravitational collapse of the order of 2.0-2.5, considerably larger than the average expected values for typical terrestrial craters. As a result, we obtain a crater collapse in between simple and complex, where slumping and gravitational collapse counteract the crater floor uplift and lead to suppression and burial of the central high. The Mjølnir impact in a shallow sea was responsible for a major disturbance of the water column. Following the impact-induced outward water surge, large-amplitude tsunamis were formed, and the rapid resurge of seawater into the excavated crater transported large amounts of ejecta and crater wall material back into the crater, accounting for the redestribution of ejecta material and extensive infilling.

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