It was studied how tectonic earthquake-induced static stress changes could have contributed to favouring the 22 December 2012 major eruption at Copahue volcano, Chile. Numerical modelling indicates that the vertical N60°E-striking magma pathway below Copahue was affected by a normal stress reduction induced by the Mw 8.8 Chile earthquake of 27 February 2010. A sensitivity analysis suggests that N-, NE- and E-striking vertical planes are affected by normal stress decrease (maximum at the NE-striking plane), and that also a possible inclined N60°E plane is affected by this reduction. Copahue did not have any magmatic event since 2000. Seismic signals of awakening started in April 2012 and the first volcanic event occurred on July 2012. Thus, it is here suggested a possible earthquake-induced feedback effect on the crust below the volcanic arc up to at least 3years after a large subduction earthquake, favouring new eruptions.

Bonali, F. (2013). Earthquake-induced static stress change on magma pathway in promoting the 2012 Copahue eruption. TECTONOPHYSICS, 608(26 November 2013), 127-137 [10.1016/j.tecto.2013.10.006].

Earthquake-induced static stress change on magma pathway in promoting the 2012 Copahue eruption

Bonali, FL
2013

Abstract

It was studied how tectonic earthquake-induced static stress changes could have contributed to favouring the 22 December 2012 major eruption at Copahue volcano, Chile. Numerical modelling indicates that the vertical N60°E-striking magma pathway below Copahue was affected by a normal stress reduction induced by the Mw 8.8 Chile earthquake of 27 February 2010. A sensitivity analysis suggests that N-, NE- and E-striking vertical planes are affected by normal stress decrease (maximum at the NE-striking plane), and that also a possible inclined N60°E plane is affected by this reduction. Copahue did not have any magmatic event since 2000. Seismic signals of awakening started in April 2012 and the first volcanic event occurred on July 2012. Thus, it is here suggested a possible earthquake-induced feedback effect on the crust below the volcanic arc up to at least 3years after a large subduction earthquake, favouring new eruptions.
Articolo in rivista - Articolo scientifico
Copahue; Coulomb; Earthquake-induced eruptions; Numerical modelling; Static stress change; Triggering;
English
16-ott-2013
2013
608
26 November 2013
127
137
none
Bonali, F. (2013). Earthquake-induced static stress change on magma pathway in promoting the 2012 Copahue eruption. TECTONOPHYSICS, 608(26 November 2013), 127-137 [10.1016/j.tecto.2013.10.006].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/183663
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