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Volatile ecosystems, a natural wind tunnel, volcanic lightning, and stress & strain on Venus
Date:12/11/2013

ts the mean value of temperature and precipitation and is located some distance back from the furthest terminal moraine. We use a glacier model developed to determine the mean length of eleven Last Glacial Maximum (LGM) glaciers in the northern Front Range, Colorado, USA. We estimate that mean glacier lengths during the LGM were ~10% to 15% back from the LGM terminal moraines.


New constraints on volcano-tectonic evolution of large volcanic edifices on Venus from stereo topography-derived strain estimates

Patrick J. McGovern et al., Lunar and Planetary Institute, USRA (Universities Space Research Association), Houston, Texas 77062, USA; mcgovern@lpi.usra.edu. Published online ahead of print on 6 Dec. 2013; http://dx.doi.org/10.1130/G34919.1.

A number of large volcanoes on the planet Venus exhibit systems of fractures and faults on their surfaces, as seen in radar images of the planet's surface from the Magellan mission. Analysis of the heights of these faults can tell us the amount of stretching (strain) that the surface experienced. In turn, estimates of strain can be compared to predictions from mechanical models of inflation of sub-surface magma chambers, in order to constrain the size and depth of such chambers. Unfortunately, until recently the available topographic data could not resolve features of the scale of the faults. Here, Patrick McGovern and colleagues use new topographic data derived from applying stereo processing to the radar images. The new topography shows that fault systems on two prominent Venus volcanoes are significantly deeper than previously assumed. For the first time, McGovern and colleagues apply a model for a thin circular magma chamber, rather than the typical spherical chamber, to volcano strain analysis, yielding estimates for chamber depth and size at the volcanoes Anala Mons (depth less than 8
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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Volatile ecosystems, a natural wind tunnel, volcanic lightning, and stress & strain on Venus
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