Results 201 to 210 of about 14,263 (225)
Some of the next articles are maybe not open access.
Impact craters with ejecta flows and central pits on Mercury
Planetary and Space Science, 2013Abstract Impact craters with ejecta flows and/or central pits have been found on Venus, the Moon, Earth, Mars, and some icy satellites. Using the MESSENGER camera data obtained during the orbital mission, we found craters with ejecta flows and central pits on Mercury. The ejecta flows differ from normal ballistically emplaced ejecta deposits in their
Xiao Z., KOMATSU, Goro
openaire +1 more source
Sub-surface structures and collapse mechanisms of summit pit craters
Journal of Volcanology and Geothermal Research, 2001Abstract Summit pit craters are found in many types of volcanoes and are generally thought to be the product of collapse into an underpressured reservoir caused by magma withdrawal. We investigate the mechanisms and structures associated with summit pit crater formation by scaled analogue experiments and make comparisons with natural examples. Models
Roche, Olivier +2 more
openaire +3 more sources
Evidence for an explosive origin of central pit craters on Mars
Icarus, 2015Abstract Kilometer-scale pits are nested in the centers of many impact craters on Mars as well as on icy satellites. They have been inferred to form in the presence of a water–ice rich substrate; however, the process(es) responsible for their formation is still debated.
Nathan R. Williams +3 more
openaire +1 more source
PITS, OR CRATER-LIKE HOLES, IN THE OPTIC DISK
Archives of Ophthalmology, 1942In 1882 Wiethe reported a case of congenital deformity of the optic disk. His patient was a woman aged 62 who presented herself for examination because of glaucoma in the right eye. Examination of the left eye revealed vision of 20/30, normal color perception, tension and fields, and no scotoma present. Ophthalmoscopic examination showed papilla round,
openaire +1 more source
Valleys in pit craters on Mars: Characteristics, distribution, and formation mechanisms
Icarus, 2013Abstract New observations of central pit craters on Mars reveal that some craters contain prominent interior valley networks that drain into their central pit. In this study, we catalog the distribution of pit craters with associated valleys, and characterize in detail five diverse, well-preserved examples.
Samantha E. Peel, Caleb I. Fassett
openaire +1 more source
Pit-floor craters on Mercury: Evidence of near-surface igneous activity
Earth and Planetary Science Letters, 2009Abstract High-resolution images obtained during the first MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) flyby of Mercury show evidence for igneous modification of the surface through the formation of pit craters on the floors of several impact craters.
Jeffrey J. Gillis-Davis +7 more
openaire +1 more source
Origin of pit chains in the floor of lunar Copernican craters
Science China Physics, Mechanics and Astronomy, 2010There are small pit chains in the floor of lunar Copernican craters. They are usually so small in scale that there are few lunar spacecrafts to detect their detailed morphology. Combining camera data from Lunar Orbiter, Lunar Reconnaissance Orbiter (LRO), Kaguya and Chang’e-1 missions, 5 representative large Copernican craters on various terrains of ...
ZhiYong Xiao +4 more
openaire +1 more source
The theoretical plausibility of central pit crater formation via melt drainage
Icarus, 2012Central pit craters are seen in large craters on some icy satellites and on Mars. We investigate the hypothesis that central pits form when impact melt drains into fractures beneath the impact crater. For this process to occur, the volume of melt generated during the impact, the volume of void space in fractures beneath the impact crater, and the ...
Catherine M. Elder +2 more
openaire +1 more source
PIT CRATER CHAINS AND SUBTERRANEAN TECTONIC CAVES
Geological Society of America Abstracts with Programs, 2020Danielle Y. Wyrick, Debra Buczkowski
openaire +1 more source