Mathematics – Logic
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997nyasa.822..403r&link_type=abstract
Near-Earth Objects, the United Nations International Conference: Proceedings of the international conference held April 24-26, 1
Mathematics
Logic
4
Environment Effects, Asteroids, Astronomy, Comets, Crossings, Geological Surveys, Hypotheses, Disasters
Scientific paper
Several quantitative tests of a general hypothesis linking impacts of large asteroids and comets with mass extinctions of life are possible based on astronomical data, impact dynamics, and geological information. The waiting of large-body impacts on the Earth derive from the flux of Earth-crossing asteroids and comets, and the estimated size of impacts capable of causing large-scale environmental disasters, predict that impacts of objects greater than or equal to 5 km in diameter (greater than or equal to 10 7 Mt TNT equivalent) could be sufficient to explain the record of approximately 25 extinction pulses in the last 540 Myr, with the 5 recorded major mass extinctions related to impacts of the largest objects of greater than or equal to 10 km in diameter (greater than or equal to 108 Mt Events). Smaller impacts (approximately 10 6 Mt), with significant regional environmental effects, could be responsible for the lesser boundaries in the geologic record.
Haggerty Bruce M.
Pagano Thomas C.
Rampino Michael R.
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