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Lunar and Planetary Science XXXVI (2005) sess15.pdf Tuesday, March 15, 2005 IMPACTS: EJECTA EFFECTS 1:30 p.m. Salon A Chairs: O. S. Barnouin-Jha F. T. Kyte 1:30 p.m. Barnouin-Jha O. S. * Cintala M. J. Crawford D. A. Impact into Coarse Grained Spheres [#1585] In this study, we use experimental techniques to report on how coarse grained targets might influence ejecta excavation and crater shape. 1:45 p.m. Yamamoto S. * Okabe N. Kadono T. Sugita S. Matsui T. Measurements of Ejecta Velocity Distribution by a High-Speed Video Camera [#1600] We performed impact experiments into glass sphere targets in order to measure the velocity distribution of ejecta with velocities ranging from a few to tens of m/s. 2:00 p.m. Schönian F. * Tagle R. Stöffler D. Kenkmann T. Geology of Southern Quintana Roo (Mexico) and the Chicxulub Ejecta Blanket [#2389] In southern Quintana Roo (Mexico) the Chicxulub ejecta blanket is discontinuously filling a karstified pre-KT land surface. This suggests a completely new scenario for the geological evolution of the southern Yucatán Peninsula. 2:15 p.m. Kring D. A. * Showman A. P. Durda D. D. Global Winds and Aerosol Updrafts Created by the Chicxulub Impact Event [#1544] Impact-generated thermal contrasts in the atmosphere may have generated high-velocity winds aloft and at the Earth’s surface. 2:30 p.m. Kyte F. T. * Gersonde R. Kuhn G. Detailed Results on Analyses of Deposits of the Eltanin Impact, Recovered in Sediment Cores from Polarstern Expedition ANT-XVIII/5a [#2129] An expedition by the RV Polarstern in 2001 explored 80,000 km2 of ocean floor and recovered 16 sediment cores containing ejecta deposits from the Eltanin impact. Details of this deep-ocean impact and the most meteorite-rich locality on Earth are discussed. 2:45 p.m. Ohno S. * Sugita S. Kadono T. Ishibashi K. Igarashi G. Matsui T. An Experimental Method to Estimate the Chemical Reaction Rate in Vapor Clouds: An Application to the K/T Impact [#1794] We propose a new experimental method to estimate the chemical reaction rate in vapor clouds. We also apply the method to the redox reactions of sulfur oxides and discuss the implication of the results to the K/T event. 3:00 p.m. Sheffer A. * Melosh H. J. Why Moldavites are Reduced [#1468] We use an isentropic cooling path to model the formation and oxygen reduction of moldavite tektites. The cooling path is inherently reducing, so no reducing agents are necessary. .

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The Eltanin Impact and Its Tsunami Along the Coast of South America: Insights for Potential Deposits
Earth and Planetary Science Letters 409 (2015) 175–181 Contents lists available at ScienceDirect Earth and Planetary Science Letters www.elsevier.com/locate/epsl The Eltanin impact and its tsunami along the coast of South America: Insights for potential deposits Robert Weiss a, Patrick Lynett b, Kai Wünnemann c a Department of Geosciences, Virginia Tech, VA 24061, USA b Sonny Astani Department of Civil and Environmental Engineering, University of Southern California, Los Angeles, CA 90089-2531, USA c Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, Invalidenstrasse 43, 10115 Berlin, Germany a r t i c l e i n f o a b s t r a c t Article history: The Eltanin impact occurred 2.15 million years ago in the Bellinghausen Sea in the southern Paciﬁc. Received 21 June 2014 While a crater was not formed, evidence was left behind at the impact site to prove the impact origin. Received in revised form 10 October 2014 Previous studies suggest that a large tsunami formed, and sedimentary successions along the coast of Accepted 19 October 2014 South America have been attributed to the Eltanin impact tsunami. They are characterized by large clasts, Available online xxxx often several meters in diameter. Our state-of-the-art numerical modeling of the impact process and its Editor: J. Lynch-Stieglitz coupling with non-linear wave simulations allows for quantifying the initial wave characteristic and the Keywords: propagation of tsunami-like waves over large distances. We ﬁnd that the tsunami attenuates quickly with −1.2 Eltanin impact η(r) ∝ r resulting in maximum wave heights similar to those observed during the 2004 Sumatra tsunamis and 2011 Tohoku-oki tsunamis.
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