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Impact Crater Formation in Rock
Journal of Applied Physics, 1960Craters were produced by firing spherical steel projectiles of 316- and 932−in. diam into sandstone and granite at velocities ranging from 300 to 6000 ft/sec. Impact angles of 30, 60, and 90 deg were used for the sandstone and 90 deg for the granite. The craters are formed by two mechanisms: (a) crushing of material in front of the projectile and (b ...
William C. Maurer, John S. Rinehart
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Nature, 2005
Aerial surveys of the Vredefort impact crater in South Africa suggest that it is only weakly magnetic. The rocks themselves tell a different story, but does this apply to giant impact basins on Mars?
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Aerial surveys of the Vredefort impact crater in South Africa suggest that it is only weakly magnetic. The rocks themselves tell a different story, but does this apply to giant impact basins on Mars?
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Impact Cratering and Post-impact Sedimentation
2010The impact origin of the Mjolnir structure has been confirmed by detailed studies of lithologies from two shallow boreholes; one close to the crater center (7329/03-U-01) and one 30 km NE from the crater periphery (7430/10-U-01) (Fig. 1.7). The boreholes revealed brecciated sediments containing shocked quartz grains.
Henning Dypvik +5 more
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Science, 2018
Geology Ancient meteorite impact craters have been found across the surface of Earth. Kjaer et al. performed an ice-penetrating radar analysis of the Hiawatha Glacier in northwest Greenland and discovered an impact crater under Earth's ice sheets. The oldest ice in this crater is debris-ridden or heavily disturbed, suggesting that the impact postdates ...
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Geology Ancient meteorite impact craters have been found across the surface of Earth. Kjaer et al. performed an ice-penetrating radar analysis of the Hiawatha Glacier in northwest Greenland and discovered an impact crater under Earth's ice sheets. The oldest ice in this crater is debris-ridden or heavily disturbed, suggesting that the impact postdates ...
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The effect of viscosity in hypervelocity impact cratering
4th Aerodynamic Testing Conference, 1969Numerical method for time dependent compressible Navier-Stokes equations applied to axisymmetric flow field produced by hypervelocity impact, examining viscous ...
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Impact cratering and regolith dynamics
Physics and Chemistry of the Earth, 1977The most recent models concerning mechanical aspects of lunar regolith dynamics related to impact cratering use probabilistic approaches to account for the randomness of the meteorite environment in both space and time. Accordingly the absolute regolith thickness is strictly a function of total bombardment intensity and absolute regolith growth rate in
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Potassium‐rich sandstones within the Gale impact crater, Mars: The APXS perspective
, 2016L. Thompson +10 more
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