Comparison of seismic activity for Llaima and Villarrica volcanoes prior to and after the Maule 2010 earthquake.

Mora Stock, Cindy, Thorwart, Martin, Wunderlich, Tina, Bredemeyer, Stefan, Hansteen, Thor H. and Rabbel, Wolfgang (2014) Comparison of seismic activity for Llaima and Villarrica volcanoes prior to and after the Maule 2010 earthquake. International Journal of Earth Sciences, 103 (7). pp. 2015-2028. DOI 10.1007/s00531-012-0840-x.

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Llaima and Villarrica are two of the most active volcanoes in the Chilean Southern Volcanic Zone and presently show contrasting types of activity. Llaima is a closed vent edifice with fumarolic activity, while Villarrica has an open vent with a lava lake, continuous degassing and tremor activity. This study is focused on characterizing the relationships between volcanic and seismic activity in the months before and after the 2010 M8.8 Maule earthquake, which was located in NNW direction from the volcanoes. Time series for tremors, long-period and volcano-tectonic events were obtained from the catalogue of the Volcanic Observatory of the Southern Andes (OVDAS) and from the SFB 574 temporary volcanic network. An increase in the amount of tremor activity, long-period events and degassing rates was observed at Villarrica weeks before the mainshock and continued at a high level also after it. This increase in activity is interpreted to be caused by enhanced magma influx at depth and may be unrelated to the Maule event. In Llaima, an increase in the volcano-tectonic activity was observed directly after the earthquake. The simultaneous post-earthquake activity at both volcanoes is consistent with a structural adjustment response. Since this enhanced activity lasted for more than a year, we suggest that it is related to a medium-term change in the static stress. Thus, the Maule earthquake may have affected both volcanoes, but did not trigger eruptions, from which we assume that none of the volcanoes were in a critical state.

Document Type: Article
Additional Information: WOS:000343216700019
Keywords: Llaima volcano, Villarrica volcano, Volcano seismicity, Maule earthquake, Chile
Research affiliation: OceanRep > SFB 574 > PAM
OceanRep > SFB 574
Kiel University
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1007/s00531-012-0840-x
ISSN: 1437-3254
Projects: SFB574
Contribution Number:
SFB 574238
Date Deposited: 31 Jan 2012 11:19
Last Modified: 23 Sep 2019 23:09

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