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Date:4/3/2014

een made based on the size of impact spherules, but there has been little evidence to test the models. This paper by Matthew S. Huber and colleagues describes a previously unknown occurrence of impact spherules that have the same age as the Vredefort impact event, and describes the likelihood that the ejecta is derived from the event. This extends our understanding of the cratering record on Earth and provides an additional constraint on models of the relationship between impact craters and the impact spherules, which can be applied in the future to resolve outstanding questions in the field of impact crater research.


The signature and mechanics of earthquake ruptures along shallow creeping faults in poorly lithified sediments
Fabrizio Balsamo et al., NEXT -- Natural and Experimental Tectonics Research Group, Department of Physics and Earth Sciences, Parma University, Parco Area delle Scienze 157A, 43124 Parma, Italy. Published online 21 Mar. 2014; http://dx.doi.org/10.1130/G35272.1.

Earthquakes occur episodically along shallow, creeping faults in poorly lithified sediments. This represents an unsolved paradox, largely due to (1) our poor understanding of the mechanics governing creeping faults and (2) the lack of documented geological evidence showing how coseismic rupturing overprints creeping, stable faults in near-surface conditions. In this paper, Fabrizio Balsamo and colleagues describe the signature of seismic ruptures propagating along shallow creeping faults affecting unconsolidated sediments in the forearc Crotone Basin (south Italy). Field observations of deformation band-dominated fault zones show widespread foliated cataclasites in fault cores, locally overprinted by sharp slip surfaces decorated by thin black gouge layers. Compared to foliated cataclasites, black gouges possess much lower grain size/porosity/permeability and are characterized
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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