This shows the largest of the newly detected graben found in highlands of the lunar farside. The broadest graben is about 500 meters (1,640 feet) wide and topography derived from Lunar Reconnaissance Orbiter Camera (LROC) Narrow Angle Camera (NAC) stereo images indicates they are almost 20 meters (almost 66 feet) deep. Credit: NASA/Goddard/Arizona State University/Smithsonian Institution (via NASA)
Structural Colors (by zeesstof)
The slightly odd angle of the pale aeolian rocks here is the result of the interaction between two big faults. The inclined block between them is, in this case, a Relay Ramp. Partly because of the faults and partly due to erosion of the altered rock, the sediments show a multitude of reds, greens and other colors here.
Fuente: Flickr / zeesstof
As part of a project funded by the Southern California Earthquake Center, David Lynch (USGS), Kenneth Hudnut (USGS), David Dearborn (LLNL) and John Bayless (First Point Scientific Inc.) have made a number of low altitude photographic flights over the San Andreas Fault and parts of the Banning Fault. The goal is to obtain imagery with a spatial resolution of just a few centimeters on the ground; for planning field operations, to document the surface state of the fault before a major earthquake, and to provide many examples of fault landforms for education. (…) Together, they form a continuous record from the Salton Sea in Imperial County to central California, near California State Highway 198 in Monterey County. All photographs are in the public domain and can be used by anyone for any reason. Credit: David K. Lynch. (via EPOD)
A 3-D view of the surface rupture of the April 4, 2010, El Mayor–Cucapah Earthquake (red line) reveals a new fault line connecting the Gulf of California with the Elsinore fault, which is likely to become the main fault at the boundary between the Pacific and the North America plates. Credit: Caltech’s Tectonics Observatory. (via Caltech)
A basic analysis of the landforms show that left-lateral (sinistral) motion of the EPGFZ fault [Haiti], probably in thousands of large earthquakes over a couple million years, has offset two large river courses by many kilometers. (via Earth Observatory of Singapore)
The March 11th Japan (Tohoku) earthquake and its tectonic setting. The earthquake hypocentres shown include earthquakes greater than greater than magnitude 5.0 in the period 1964-2007, and the 11-March-2011 M 9.0 Tohoku (Japan) earthquake and aftershocks. Slip between the plates occurred on the segment of the megathrust fault highlighed in yellow, extending from the cross section through to the northern end of Honshu. The size of the circle represents the magnitude of the earthquake; the earthquakes shown in green occur deeper than 70 km below the surface. Earthquake data are from the USGS. (via Earth Observatory of Singapore)
The Rurrandverwerfung (Rurrand Fault) between Aachen and Cologne, Germany. An active, NW-SE trending normal fault in the Lower Rhine Graben area and a possible candidate for the 1756 Düren earthquakes. Now outcropped due to construction works for the new highway A4. (50.850°N, 6.510°E) (via Paleoseismicity)
Rocks do not suffer deformation… (by Marli Bryant Miller)
… they enjoy it!
These rocks (green and white is mylonitic gneiss; brown is calcite marble) once flowed ductiley —when they were deeper in the crust and hot. Since then they cooled and were broken by numerous fractures and faults. They now lie just beneath one of the range-frontal fault zones (Badwater Turtleback fault).
Fuente: Flickr / marlimiller
July’s Nature Geoscience cover photo: The southern San Andreas fault terminates in a stepover zone — several small faults that separate major fault segments — beneath the Salton Sea. Analysis of movements on the stepover zone faults indicates that periodic flooding of the palaeo-Salton Sea during the late Holocene could have triggered earthquakes on the San Andreas fault. The image shows a large obsidian boulder that rests on the slope of Red Hill at the southeast edge of the Salton Sea, California, USA. The salt-encrusted shoreline of the Salton Sea is visible in the distance. See “Loading of the San Andreas fault by flood-induced rupture of faults beneath the Salton Sea”, by Brothers et al., p. 486-492. Photo by Jenny E. Ross.