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Published July 8, 2002 | Published
Book Section - Chapter Open

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


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.

Additional Information

© 2002 American Institute of Physics Research supported by NASA. Contribution number 8816, Division of Geological and Planetary Sciences.

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August 21, 2023
August 21, 2023