نتایج جستجو برای: Impact Crater
تعداد نتایج: 763604 فیلتر نتایج به سال:
Determination of soil moisture content is of vital importance to many fields of study; civil engineering, hydrology, agriculture, geology, ecology and forestry. The occurrence of impact crater in Bukit Bunuh, a meteorite impacted area, made it an area of great interest to many researchers. In view of the process of impact cratering, the subsurface soil characteristics such as moisture content o...
We present the results of experiments studying the shape of craters formed by the normal impact of a solid spherical projectile into a deep noncohesive granular bed at low energies. The resultant impact crater surfaces are accurately digitized using laser profilometry, allowing for the detailed investigation of the crater shape. We find that these impact craters are very nearly hyperbolic in pr...
[1] Lonar crater is a simple, bowl-shaped, near-circular impact crater in the 65 Myr old Deccan Volcanic Province in India. As Lonar crater is a rare terrestrial crater formed entirely in basalt, it provides an excellent opportunity to study the impact deformation in target basalt, which is common on the surfaces of other terrestrial planets and their satellites. The present study aims at docum...
[1] Meteor Crater provides a rare opportunity to study impact deformation of sedimentary target rocks and isolate those features from preexisting tectonic deformation and impact-generated reactivation of preexisting tectonic features. This study reports over 2500 new measurements of orientations of bedding, faults, and fractures in crater walls and in surrounding bedrock. Target rocks are chara...
Introduction: Terby impact crater is located at the northeastern part of Hellas region (75°E – 30°S) on the cratered highlands. Using multi-dataset available on this area, we investigated the geological story of Terby crater. MOLA altimetry [1] shows that Terby impact crater displays an anomalous morphology compared to other impact crater of ~200 km in diameter. Instead of a circular depression...
Introduction: Impact crater clusters or crater strewn fields from primary impacts are found in MOC [1, 2], CTX, and HiRISE images [3, 4]. We present the analysis of new data on small craters and crater clusters accumulated by the HiRISE team for the first 10,000 orbits of MRO. New Craters on Mars: Repetitive imaging of Mars by various spacecraft revealed 20 potential " new " impact sites [2]: i...
Foreign object damage (FOD) occurs when hard, millimeter-sized objects such as gravel or sand and even the pieces of the engine components are ingested into aircraft jet engines. Particles impacting blades produce small indentation craters which can become sites for fatigue crack initiation, severely limiting the lifetime of the blade. In this study, the impact on the edge of a thin plate is in...
Introduction: The 52±6 ka old Lonar crater, India [1, 2], is the only known terrestrial impact crater in basaltic target-rocks (Deccan Traps, ~65 Ma). The impactor asteroid of this ~1.8 km diameter crater was perhaps a chondrite [3] that hit the pre-impact surface from east at an angle of 30-45 o with horizon [4]. Presently, we report the possible distribution of impact-induced stress around Lo...
The Mars rover Opportunity has explored Victoria crater, an approximately 750-meter eroded impact crater formed in sulfate-rich sedimentary rocks. Impact-related stratigraphy is preserved in the crater walls, and meteoritic debris is present near the crater rim. The size of hematite-rich concretions decreases up-section, documenting variation in the intensity of groundwater processes. Layering ...
Introduction: Most impact structures on Earth are modified by erosion. First order structural features of impact craters such as the crater diameter, the size of the central uplift, and ring syncline can be measured in field campaigns [e.g. 1] or by geophysical explorations [e.g. 2,3]. However, these quantities deviate from the original crater diameter or other morphological features of the pri...
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