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Geology tracks eruptions, earthquakes, erosion, extinctions & more
Date:7/12/2013

ontents at fragmentation, which are frequently invoked in order to explain lava-like features. Viscous heating can heat the underlying deposits up so that it is potentially hotter than the pyroclastic flows themselves. The history of these materials begins at high temperature in a magma chamber, goes through fragmentation and transport as ash particles in a pyroclastic flow, and ends with welding and heating back to a liquid that may be hotter even than the magma chamber from whence it came.


Sinkhole precursors along the Dead Sea, Israel, revealed by SAR interferometry
Ran N. Nof et al., Department of Geological and Environmental Sciences, Ben-Gurion University of the Negev, Mailbox 653, Beer-Sheva 84105, Israel. First published on 3 July 2013, http://dx.doi.org/10.1130/G34505.1.

Toward operational sinkhole early warning system along the Dead Sea, Israel: The water level in the Dead Sea has been dropping at an increasing rate since the 1960s, exceeding a meter per year during the past decade. This drop has triggered the formation of sinkholes and widespread land subsidence along the Dead Sea shoreline, resulting in severe economic loss and infrastructural damage. We examined the spatiotemporal evolution of sinkhole-related subsidence using Satellite based Interferometric synthetic aperture radar (InSAR) measurements and field surveys, and resolved millimeteric-scale precursory subsidence in all sinkhole sites that we examined. It seems that filling of newly formed sinkholes with gravel and mud injections into drill-holes enhance land subsidence, enlarge existing sinkholes and form new sinkholes. Apart from shedding light on the mechanical process, the results of our study may pave the way for the implementation of an operational sinkhole early warning system.


The thickness of subduction plate boundary faults from the seafloor into the seismog
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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