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Article: Spatial mapping of the b-value at Galeras volcano, Colombia, using earthquakes recorded from 1995 to 2002.
- Article from:
- Earth Sciences Research Journal
- Article date:
- June 1, 2005
- Author:
CopyrightCOPYRIGHT 2005 Universidad Nacional de Colombia, Departamento de Geociencias. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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ABSTRACT
The catalog of volcano-tectonic earthquakes at Galeras volcano, Colombia, was analyzed to determine the magnitude of completeness of the seismograph network and to explore the subsurface structure by mapping the b-value of the frequency-magnitude distribution. By using 8,435 well-located earthquakes between 1989-2002 we found the catalog to be complete above MD=0.26. The average b-value of 0.71 was found to be the result of an unintentionally stretched magnitude scale. The two- and three-dimensional mapping of b-value illuminates a vertically elongated structure beneath the active crater of Galeras down to a depth of 6 km, which may be associated with a ...
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APTOPIX Colombia Galeras Volcano
AP Images;
January 17, 2008 ;
241 words
...This video frame released by the Colombian Institute of Geology and Mining, INGEOMINAS, shows the Galeras volcano erupting in Pasto, southern Colombia, Thursday, Jan. 17, 2008. The volcano spread ashes for kilometers prompting an evacuation ...
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