Bulletin of Volcanology

, Volume 72, Issue 9, pp 1093–1107

Long-period seismicity during magma movement at Volcán de Colima

  • Nick R. Varley
  • Raúl Arámbula-Mendoza
  • Gabriel Reyes-Dávila
  • John Stevenson
  • Rob Harwood
Research Article

Abstract

During the period from February to September 2005, Volcán de Colima produced 30 Vulcanian explosions of sufficient magnitude to produce pyroclastic flows of variable size, with a total volume of at least 2.5 × 106 m3. Swarms of long-period events were associated with each event, their duration ranging from about 6 h to 3 days and each swarm containing up to 886 events. The characteristics of the swarms have been studied to understand the source mechanism and their relationship with the Vulcanian explosions. In total, 12,548 long-period events were analysed using various comparative and statistical methods. Patterns were not apparent in the data with no correlation between different properties of the swarms (duration, magnitude or frequency of occurrence of LP events) and the magnitude of the associated Vulcanian explosion, whether recorded by seismicity, volume of pyroclastics or altitude of the eruption column. This, along with other characteristics of the swarms, such as the continuation of the swarm after the explosion, with an increase in long-period event amplitude in some cases, suggests that the mechanism is not merely associated with the pressurization under an impermeable cap and resulting pressure differentials between adjacent volumes within the system. It is more likely that the production of long-period events is dominated by brittle fracturing on the margins of an ascending magma body. A model is proposed whereby the unloading above the ascending magma column produced by a Vulcanian explosion resulted in an increase in ascent rate, reflected in the increasing amplitude of long-period events. The results reflect the complexity of non-linear processes involved during magma ascent, degassing, crystallization and rupture of the impermeable plug during the Vulcanian process. At Volcán de Colima, as at many volcanoes, long-period events represent a useful precursor for eruptive activity. For monitoring, this paper highlights some useful analyses that can be carried out, which could illustrate certain characteristics of an eruptive episode. A preliminary model is presented of the conduit processes at work during the cyclic extrusive and explosive activity during 2005.

Keywords

Long-period seismicity Volcano monitoring Vulcanian activity Conduit processes 

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Nick R. Varley
    • 1
  • Raúl Arámbula-Mendoza
    • 2
  • Gabriel Reyes-Dávila
    • 3
  • John Stevenson
    • 1
  • Rob Harwood
    • 1
  1. 1.Facultad de CienciasUniversidad de ColimaColimaMexico
  2. 2.Instituto de Geofísica, Universidad Nacional Autónoma de MéxicoMéxico CityMexico
  3. 3.Centro Universitario de Estudios VulcanológicosUniversidad de ColimaColimaMexico

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