| Autor: |
Lamb OD; Department of Earth, Ocean and Ecological Sciences University of Liverpool Liverpool UK., De Angelis S; Department of Earth, Ocean and Ecological Sciences University of Liverpool Liverpool UK., Wall RJ; Department of Earth, Ocean and Ecological Sciences University of Liverpool Liverpool UK., Lamur A; Department of Earth, Ocean and Ecological Sciences University of Liverpool Liverpool UK., Varley NR; Facultad de Ciencias Universidad de Colima Colima Mexico., Reyes-Dávila G; Centro Universitario de Estudios e Investigaciones Vulcanología Universidad de Colima Colima Mexico., Arámbula-Mendoza R; Centro Universitario de Estudios e Investigaciones Vulcanología Universidad de Colima Colima Mexico., Hornby AJ; Department of Earth, Ocean and Ecological Sciences University of Liverpool Liverpool UK., Kendrick JE; Department of Earth, Ocean and Ecological Sciences University of Liverpool Liverpool UK., Lavallée Y; Department of Earth, Ocean and Ecological Sciences University of Liverpool Liverpool UK. |
| Abstrakt: |
We combine geophysical and experimental observations to interpret preeruptive unrest at Volcán de Colima in 1998. 17,893 volcanic earthquakes were detected between 1 October and 31 December 1998, including 504 clusters. Using seismic ambient noise interferometry, we observe a drop in velocity prior to the eruption linked to damage accumulation during magma ascent. This is supported by experimental observations where static stress causes a velocity decrease prior to failure. Furthermore, we observe acoustic emission clusters during the experiments, with lower porosity samples producing higher numbers of repeaters. This behavior introduces tensile failure as an additional viable mechanism for clusters during magma ascent. The findings suggest that preeruptive magma ascent may be monitored to variable degrees of accuracy via descriptions of damage accumulation and associated seismic velocity changes. |
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