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Depth of Cracking beneath Impact Craters: New Constraint for Impact Velocity

Ahrens, Thomas J. and Xia, Kaiwen and Coker, Demirkan (2002) Depth of Cracking beneath Impact Craters: New Constraint for Impact Velocity. In: Shock Compression of Condensed Matter -- 2001: Proceedings of the 12th Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter. American Institute of Physics Conference Proceedings. No.620. American Institute of Physics , Melville, NY, pp. 1393-1396. ISBN 0-7354-0068-7.

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Both small-scale impact craters in the laboratory and less than 5 km in diameter bowl-shaped craters on the Earth are strength (of rock) controlled. In the strength regime, crater volumes are nearly proportional to impactor kinetic energy. The depth of the cracked rock zone beneath such craters depends on both impactor energy and velocity. Thus determination of the maximum zone of cracking constrains impact velocity. We show this dependency for small-scale laboratory craters where the cracked zone is delineated via ultrasonic methods. The 1 km-deep cracked zone beneath Meteor Crater is found to be consistent with the crater scaling of Schmidt (1) and previous shock attenuation calculations.

Item Type:Book Section
Additional Information:©2002 American Institute of Physics Research supported by NASA. Contribution number 8816, Division of Geological and Planetary Sciences.
Subject Keywords:meteorite craters; velocity; cracks; Earth; shock waves
Series Name:American Institute of Physics Conference Proceedings
Issue or Number:620
Record Number:CaltechAUTHORS:AHRaipcp02
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2283
Deposited By: Archive Administrator
Deposited On:21 Mar 2006
Last Modified:02 Oct 2019 22:51

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