Physics – Condensed Matter
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..shk.j5002a&link_type=abstract
American Physical Society, Shock Compression of Condensed Matter Meeting, June 24-29, 2001 Renaissance Waverly Hotel, Atlanta, G
Physics
Condensed Matter
Scientific paper
Extension of impact cratering calculations to late times, for example, for a 12 km/s of a 5 km radius silicate impactor onto a silicate target is observed to give a rebounding (oscillating) crater that comes to rest with a broad central peak of ~ 5 km radius some 20 min. after impact. Oscillating craters also form vertical faults (in target rocks) as a result of initial shear zone banding. Present damage, D, models take into account generation of cracks that accommodate the finite strain of the rock. Here D = (1-m/m_0) where m is either an elastic modulus or strength of the target rocks and m0 is initial value. Refraction seismic data for terrestrial craters demonstrate that damage zones extend to a depth H below the surface. H varies from ~ 1 km for small, strength-controlled craters such as Meteor Crater and extends to 14 km for the 300 km diameter Vredefort Crater. Experiments with 0.15 m targets yield measured values of ~ 3.5 cm for the characteristic attenuation distance to the stress levels of tensional failure for impacts conducted with a 1 km/s, 700 mg aluminum projectile into gabbro. These results are generally concordant with the observed depth that tensile cracks are driven by an impact and the shock pressure has decayed at this distance to a value about the measured spall strength.
Ahrens Thomas J.
Coker Demirkan
O'Keefe John D.
Xia Kaiwen
No associations
LandOfFree
Planetary impact and shock-induced damage in target rocks does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Planetary impact and shock-induced damage in target rocks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Planetary impact and shock-induced damage in target rocks will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1582250