منابع مشابه
RADARSAT InSar Monitoring of an Active Rock Avalanche
In this study, we used RADARSAT interferometrically derived images to monitor current post slide motion at the Frank Slide, a 30x 10m rock avalanche, in the Canadian Rockies. The images cover the period from September 2000 to April 2004. Our results show that the Frank slide is still active and the deformation process is localized and related to seasonal and local weather conditions. This infor...
متن کاملDinosaur diversity and the rock record.
Palaeobiodiversity analysis underpins macroevolutionary investigations, allowing identification of mass extinctions and adaptive radiations. However, recent large-scale studies on marine invertebrates indicate that geological factors play a central role in moulding the shape of diversity curves and imply that many features of such curves represent sampling artefacts, rather than genuine evoluti...
متن کاملRapid sequestration of rock avalanche deposits within glaciers
Topographic development in mountainous landscapes is a complex interplay between tectonics, climate and denudation. Glaciers erode valleys to generate headwall relief, and hillslope processes control the height and retreat of the peaks. The magnitude-frequency of these landslides and their long-term ability to lower mountains above glaciers is poorly understood; however, small, frequent rockfal...
متن کاملAnalysis of rock-fall and rock-fall avalanche seismograms in the French Alps
This study reviews seismograms from 10 rock-fall events recorded between 1992 and 2001 by the permanent seismological network Sismalp in the French Alps. A new seismic magnitude scale was defined, which allowed us to compare and classify ground-motion vibrations generated by these Alpine rock-falls. Each rock-fall has also been characterized by its ground-motion duration t30 at an epicentral di...
متن کاملQuasi-periodic bedding in the sedimentary rock record of Mars.
Widespread sedimentary rocks on Mars preserve evidence of surface conditions different from the modern cold and dry environment, although it is unknown how long conditions favorable to deposition persisted. We used 1-meter stereo topographic maps to demonstrate the presence of rhythmic bedding at several outcrops in the Arabia Terra region. Repeating beds are approximately 10 meters thick, and ...
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ژورنال
عنوان ژورنال: Nature
سال: 1989
ISSN: 0028-0836,1476-4687
DOI: 10.1038/340271a0