On the dynamical behaviour of low-frequency earthquake swarms prior to a dome collapse of Soufriere Hill volcano, Montserrat

被引:26
作者
Hammer, C. [1 ]
Neuberg, J. W. [2 ]
机构
[1] Univ Potsdam, Inst Geosci, D-14476 Potsdam, Germany
[2] Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England
关键词
REAL-TIME; PREDICTION;
D O I
10.1029/2008GL036837
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
A series of low-frequency earthquake swarms prior to a dome collapse on Soufriere Hills volcano, Montserrat, are investigated with the emphasis on event rate and amplitude behaviour. In a single swarm, the amplitudes of consecutive events tend to increase with time, while the rate of event occurrence accelerates initially and then decelerates toward the end of the swarm. However, when consecutive swarms are considered, the average event rates seem to follow the material failure law, and the time of the dome collapse can be successfully estimated using the inverse event rate. These patterns in amplitude and event rate are interpreted as fluctuations in magma ascent velocity, which result in both the generation of low-frequency events as well as cyclic ground deformation accompanying the swarm activity. Citation: Hammer, C., and J. W. Neuberg (2009), On the dynamical behaviour of low-frequency earthquake swarms prior to a dome collapse of Soufriere Hill volcano, Montserrat, Geophys. Res. Lett., 36, L06305, doi: 10.1029/2008GL036837.
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页数:3
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