Modeling the 2.7 km in Diameter, Shallow Marine Ritland Impact Structure

Details Modeling the 2.7 km in Diameter, Shallow Marine Ritland Impact Structure Modeling the 2.7 km in Diameter, Shallow Marine Ritland Impact Structure

Apr 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012em%26p..tmp....9s&link_type=abstract

Earth, Moon, and Planets, Online First

Physics

Impact Craters, Numerical Simulation, Modeling, Ritland Crater Norway

Scientific paper

The newly discovered Ritland impact structure (2.7 km in diameter) has been modeled by numerical simulation, based on detailed field information input. The numerical model applies the SOVA multi-material hydrocode, which uses the ANEOS equation of state for granite, describing thermodynamical properties of target and projectile material. The model displays crater formation and possible ejecta distribution that strongly supports a 100 m or less water depth at the time of impact. According to the simulations resurge processes and basinal syn- and postimpact sedimentation are highly dependent on water depth; in more than 100 m of water depth, much more powerful resurge processes are generated than at water depths shallower than 100 m (the Ritland case). In Ritland the 100 m high (modeled) crater rim formed a barrier and severely reduced the resurge processes. In the case of deeper water, powerful resurge processes, tsunami wave generations and related currents could have triggered even more violent crater fill sedimentation. The presented model demonstrates the importance of understanding the interactions between water layer and both syn-impact crater fill and ejecta distribution. According to the presented simulations ejecta blocks up to 10 m in diameter could be transported up to about 5 km outside the crater rim.

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