Results 31 to 40 of about 8,008,633 (316)
Scientific Reports, 2022 Bullet impacts are a ubiquitous form of damage to the built environment resulting from armed conflicts. Bullet impacts into stone buildings result in surficial cratering, fracturing, and changes to material properties, such as permeability and surface ...
Oliver Campbell +3 more
doaj +1 more source
Automatic Mapping of Small Lunar Impact Craters Using LRO‐NAC Images
Earth and Space Science, 2022 Impact craters are the most common feature on the Moon’s surface. Crater size–frequency distributions provide critical insight into the timing of geological events, surface erosion rates, and impact fluxes.
J. H. Fairweather +5 more
doaj +1 more source
Organic matter from the Chicxulub crater exacerbated the K–Pg impact winter
Proceedings of the National Academy of Sciences of the United States of America, 2020 Significance Burn markers are observed in many records of the Cretaceous–Paleogene asteroid impact and mass extinction event. These materials could be derived from wildfires on land or from sedimentary rocks hit by the asteroid.
S. Lyons +7 more
semanticscholar +1 more source
Locating the LCROSS Impact Craters [PDF]
Space Science Reviews, 2011 The Lunar CRater Observations and Sensing Satellite (LCROSS) mission impacted a spent Centaur rocket stage into a permanently shadowed region near the lunar south pole. The Sheperding Spacecraft (SSC) separated \sim9 hours before impact and performed a small braking maneuver in order to observe the Centaur impact plume, looking for evidence of water ...
Zachary Moratto +11 more
openaire +4 more sources
The self‐secondary crater population of the Hokusai crater on Mercury
Geophysical Research Letters, 2016 Whether or not self‐secondaries dominate small crater populations on continuous ejecta deposits and floors of fresh impact craters has long been a controversy. This issue potentially affects the age determination technique using crater statistics.
Zhiyong Xiao +2 more
doaj +1 more source
Applied Sciences, 2020 Impact cratering experiments were performed on semi-infinite concrete targets with 7 mm-diameter 40CrNiMo steel long-rod projectiles at impact velocities ranging from 2117 m/s to 3086 m/s by using a two-stage combustion light-gas gun.
Yangyu Lu +6 more
doaj +1 more source
On the importance of self-secondaries
Geoscience Letters, 2018 Self-secondaries are secondary craters that are formed on both the continuous ejecta deposits and interior of the parent crater. The possible existence of self-secondaries was proposed in the late 1960s, but their identity, formation mechanism, and ...
Zhiyong Xiao
doaj +1 more source
Impact Crater Morphology and the Structure of Europa's Ice Shell [PDF]
, 2017 We performed numerical simulations of impact crater formation on Europa to infer the thickness and structure of its ice shell. The simulations were performed using iSALE to test both the conductive ice shell over ocean and the conductive lid over warm ...
E. Silber, Brandon C. Johnson
semanticscholar +1 more source
A comparative analysis of two Early Palaeozoic marine impact structures in Estonia, Baltic Sea: Neugrund and Kärdla [PDF]
Bulletin of the Geological Society of Finland, 2013 Kärdla and Neugrund are two Early Palaeozoic offshore impact structures located some 50 km apart along the Estonian coast of the Baltic Sea. They share many similarities but differing features are also found. The Kärdla impact structure is located at the
S. Suuroja, K. Suuroja, T. Flodén
doaj +1 more source
Impact fragmentation of Lonar Crater, India: Implications for impact cratering processes in basalt [PDF]
Journal of Geophysical Research: Planets, 2014 AbstractImpact fragmentation is an energetic process that has affected all planetary bodies. To understand its effects in basalt, we studied Lonar Crater, which is a rare terrestrial simple impact crater in basalt and analogues to kilometer‐scale simple craters on Mars.
P. S. Kumar +9 more
semanticscholar +3 more sources