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Seismic zones, river deltas, landslides, fossil reptiles, and more new Geology science
Date:3/6/2012

tick -- A first explanation of deep multiple seismic sources in ascending magma
Mark E. Thomas and Jurgen Neuberg, Institute of Geophysics and Tectonics, School of Earth and Environment, University of Leeds, Leeds LS12 9JT, UK. Posted online 2 Mar. 2012; doi: 10.1130/G32868.1.

At many volcanoes, low-frequency earthquakes have often been associated with the state of a volcanic system and have been employed for eruption prediction. Several models attempt to explain the generation of such earthquakes but fail to describe their clustering in tight spatial swarms and their highly repetitive nature. Mark E. Thomas and Jurgen Neuberg of the University of Leeds present a new model that not only explains the generation of a single event, but also accounts for the swarm behavior and cyclic activity. By considering magma rupture as a source mechanism of seismic events, they demonstrate that a change in conduit geometry is a likely cause for their generation. Their model matches the observed spatial and temporal behavior of low-frequency seismicity and contributes to the understanding necessary to provide estimates of magma ascent rates. This enables Thomas and Neuberg to provide an improved estimation of magma flow rates at depth which can now be linked directly to observed seismograms, and may lead to the development of reliable seismic forecasting tools for volcanic eruptions.


Constant cosmogenic nuclide concentrations in sand supplied from the Nile River over the past 2.5 m.y.
Michael Davis et al., " Institute of Earth Sciences, Hebrew University of Jerusalem, Givat Ram, Jerusalem 91904, Israel. Posted online 2 Mar. 2012; doi: 10.1130/G32574.1.

Quartz sand in the eastern Mediterranean coastal plain is supplied through an extended transport system, which includes the Nile River, east Mediterranean longshore currents, and inland eolian transport. While the concentrations of cosmogenic nuclides and their ratio in mod
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Contact: Christa Stratton
cstratton@geosociety.org
Geological Society of America
Source:Eurekalert

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