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Evidence for a meteoritic origin of the September 15, 2007, Carancas crater

Le Pichon, A. and Antier, K. and Cansi, Y. and Hernandez, B. and Minaya, E. and Burgoa, B. and Drob, D. and Evers, L. G. and Vaubaillon, J. (2008) Evidence for a meteoritic origin of the September 15, 2007, Carancas crater. Meteoritics and Planetary Science, 43 (11). pp. 1797-1809. ISSN 1086-9379.

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On September 15th, 2007, around 11:45 local time in Peru, near the Bolivian border, the atmospheric entry of a meteoroid produced bright lights in the sky and intense detonations. Soon after, a crater was discovered south of Lake Titicaca. These events have been detected by the Bolivian seismic network and two infrasound arrays operating for the Comprehensive Nuclear-Test-Ban Treaty Organization, situated at about 80 and 1620 km from the crater. The localization and origin time computed with the seismic records are consistent with the reported impact. The entry elevation and azimuthal angles of the trajectory are estimated from the observed signal time sequences and backazimuths. From the crater diameter and the airwave amplitudes, the kinetic energy, mass and explosive energy are calculated. Using the estimated velocity of the meteoroid and similarity criteria between orbital elements, an association with possible parent asteroids is attempted. The favorable setting of this event provides a unique opportunity to evaluate physical and kinematic parameters of the object that generated the first actual terrestrial meteorite impact seismically recorded.

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Additional Information:© The Meteoritical Society, 2008. Received 27 November 2007; revision accepted 11 June 2008. The authors are grateful to Dr. L. Jackson (Geophysical Survey of Canada), Dr. P. Brown (Western University of Ontario), Dr. Gonzalo Tancredi (Institute of Physics of Montevideo, Uruguay), M. Davis (North American Meteor Network), Drs. J. M. Guerin, S. Legarrec, and J. Vergoz (CEA), and N. Brachet (CTBT-O) for their interest in this study, helpful discussions and improvements of the manuscript. We thank J. P. Santoire and P. Herry (CEA) for their expertise in analyzing seismic and infrasound data. We also thank the NASA Goddard Space Flight Center, Global Modeling and Assimilation Office (GSFC-GMAO), and the NOAA National Centers for Environmental Prediction (NCEP) for providing the NWP data that went into the NRL-G2S atmospheric specifications.
Issue or Number:11
Record Number:CaltechAUTHORS:20090716-145147879
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14603
Deposited By: Ruth Sustaita
Deposited On:10 Aug 2009 23:15
Last Modified:03 Oct 2019 00:51

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