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Impact Tsunami Calculations: Hydrodynamical Simulations vs. Linear TheoryTsunamis generated by the impacts of asteroids and comets into the Earth oceans are widely recognized as a potential catastrophic hazard to the Earth s population. Our general conclusion is that linear theory is a reasonably accurate guide to behavior of tsunamis generated by impactors of moderate size, where the initial transient impact cavity is of moderate depth compared to the ocean depth. This is particularly the case for long wavelength waves that propagate fastest and would reach coastlines first. Such tsunamis would be generated in the open ocean by impactors of 300 meters in diameter, which might be expected to strike the Earth once every few thousand years, on the average. Larger impactors produce cavities deep enough to reach the ocean floor; even here, linear theory is applicable if the starting point is chosen at a later phase in the calculation when the impact crater has slumped back to produce a cavity of moderate depth and slope.
Document ID
20030110765
Document Type
Conference Paper
Authors
Korycansky, E. (California Univ. Santa Cruz, CA, United States)
Asphaug, E. (California Univ. Santa Cruz, CA, United States)
Ward, S. N. (California Univ. Santa Cruz, CA, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Publication Information
Publication: Lunar and Planetary Science XXXIV
Subject Category
Numerical Analysis
Funding Number(s)
CONTRACT_GRANT: NCC2-5480
CONTRACT_GRANT: NAG5-8914
Distribution Limits
Public
Copyright
Public Use Permitted.

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