Ejecta range: A simulation study of terrestrial impacts
de Niem, Detlef and Kührt, Ekkehard and Motschmann, Uwe (2007) Ejecta range: A simulation study of terrestrial impacts. Planetary and Space Science, 55 (7-8), pp. 900-914. Elsevier. DOI: 10.1016/j.pss.2006.12.002. ISSN 0032-0633.
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In this work the meteorite and target mass partition into high-speed ejecta during the formation of terrestrial impact craters is investigated. Multi-material hydrocode calculations are carried out through the entire excavation phase, and the mass of each material moving upwards with velocities inside a range of intervals is obtained. Impact of a 10 km diameter stony asteroid with 20km s<sup>1</sup> into the continental crust is compared for the cases of a single layer of granite, taken to be representative for the crust, and of a two-layer crust with a 3km thick sedimentary cover of limestone on top of granite basement, more appropriate for the Chicxulub crater. The proportion of meteorite and crustal material in high-speed ejecta is found as a function of velocity and time, and maximum distances to the crater can be estimated. The resulting distal (more than 7000 km) ejecta mass for vertical impact is less than a percent of the impactor mass, assuming ballistic transport. Simulations of oceanic impact of a 1 km-sized stony asteroid into 5.5km deep sea are also presented. Here, ejection of meteorite material initially is delayed, but finally it leaves the ocean in a cloud of steam and water. The velocities of meteorite material are much lower compared with the continental impact, insufficient to reach large distances on ballistic trajectories.
|Title:||Ejecta range: A simulation study of terrestrial impacts|
|Journal or Publication Title:||Planetary and Space Science|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 900-914|
|Keywords:||Impact cratering, Hydrocode, Modeling, Terrestrial craters|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W EW - Erforschung des Weltraums|
|DLR - Research area:||Space|
|DLR - Program:||W EW - Erforschung des Weltraums|
|DLR - Research theme (Project):||W - Vorhaben Asteroiden und Kometen (old)|
|Institutes and Institutions:||Institute of Planetary Research > Asteroids and Comets|
|Deposited By:||Dr.rer.nat. Ekkehard Kührt|
|Deposited On:||10 Jul 2007|
|Last Modified:||27 Apr 2009 12:56|
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