| Titre | Analysis of a crater-forming meteorite impact in Peru |
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| Auteur | Brown, P; ReVelle, D O; Silber, E A; Edwards, W N; Arrowsmith, S; Jackson, L E, Jr.; Tancredi, G; Eaton, D |
| Source | Journal of Geophysical Research vol. 113, no. E9, E09007, 2008 p. 7.1-7.13, https://doi.org/10.1029/2008JE003105 |
| Année | 2008 |
| Séries alt. | Secteur des sciences de la Terre, Contribution externe 20080024 |
| Éditeur | Wiley-Blackwell |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1029/2008JE003105 |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Région | Carancas |
| Lat/Long OENS | -73.0000 -67.0000 -15.0000 -17.0000 |
| Sujets | cratères; cratères météoriques; météorites; levés sismiques; interpretations sismiques; levés géophysiques; établissement de modèles; géologie extraterrestre; géophysique |
| Illustrations | cartes de localisation; tableaux; photographies; graphiques; graphiques |
| Diffusé | 2008 09 16 |
| Résumé | (disponible en anglais seulement)
The fireball producing a crater-forming meteorite fall near Carancas, Peru, on 15 September 2007 has been analyzed using eyewitness, seismic, and infrasound
records. The meteorite impact, which produced a crater of 13.5 m diameter, is found to have released of order 1010 J of energy, equivalent to ~2 - 3 tons of TNT high explosives based on infrasonic measurements. Our best fit trajectory solution places
the fireball radiant at an azimuth of 82° relative to the crater, with an entry angle from the horizontal of 63°. From entry modeling and infrasonic energetics constraints, we find an initial energy for the fireball to be in the 0.06 - 0.32 kton TNT
equivalent. The initial velocity for the meteoroid is restricted to be below 17 km/s from orbit considerations alone, while modeling suggests an even lower best fit velocity close to 12 km/s. The initial mass of the meteoroid is in the range of 3 - 9
tons. At impact, modeling suggests a final end mass of order a few metric tons and impact velocity in the 1.5 - 4 km/s range. We suggest that the formation of such a substantial crater from a chondritic mass was the result of the unusually high
strength (and corresponding low degree of fragmentation in the atmosphere) of the meteoritic body. Additionally, the high altitude of the impact site (3800 m.a.s.l) resulted in an almost one order of magnitude higher impact speed than would have been
the case for the same body impacting close to sea level. |
| GEOSCAN ID | 225063 |
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