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|Authors: ||Braun, T.*|
|Title: ||Electrostatic field variations related to the big Sumatra earthquake|
|Issue Date: ||Apr-2006|
|Keywords: ||sumatra earthquake|
|Abstract: ||Electrical effects in correlation with earthquakes have been reported by many authors
and different theories are discussed about the origin of these seismo-electrical effects.
The actually most popular models consider piezoelectric effects, electro-kinetic effects,
surface charge on crack wall, and rock/magma fragmentation as probable mechanism
for the generation of electromagnetic emissions. Recently also laboratory experiments
have been performed to study the mechanisms of rock fracturing, frictional
sliding, and stick-slip phenomena. In this context our group has developed a method
for monitoring of instable mountain flanks, which is presently tested at several sites.
Here we report on extraordinary electrical signals, recorded by a station in Italy, that
clearly corresponds to the Mw=9.3 earthquake of December 26, 2004, which occurred
at 00:58:50.7 (UTC) “off the west coast of northern Sumatra, Indonesia” at 3.50 N,
95.72 E. Electrical monitoring with this method can be an additional tool for the
global detection of very strong earthquakes. As this signals travel at the speed of light,
the alert window will be significantly increased.|
|Appears in Collections:||04.06.03. Earthquake source and dynamics|
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