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

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

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..620.1393a&link_type=abstract

AIP Conference Proceedings, vol. 620, iss. no. 1, p. 1393-1396

Physics

4

Cracks, Earth (Planet), Impact Velocity, Meteorite Craters, Rock Mechanics, Shock Waves, Velocity, High-Pressure And Shock Wave Effects In Solids And Liquids, Elasticity, Fracture, And Flow

Scientific paper

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.

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