Characterisation of the seismicity of Volcán de Colima: modelling the conduit processes

The seismicity produced by volcanoes is complex and can be difficult to classify. In monitoring, a classification scheme is crucial in order to interpret events, understand the development of eruptive processes and predict changes in the system. First it is necessary to examine in detail previous activity, to identify the relationships between seismicity and conduit processes.

The seismicity of Volcán de Colima during recent years has been characterized by the following types of events:

  1. Vulcanian explosions
  2. Less impulsive explosions or discrete degassing events
  3. Periods of tremor
  4. Rockfalls
  5. Pyroclastic flows
  6. Swarms of low frequency, low magnitude events
  7. Occasional long period and hybrid events

Certain characteristics of these events are being used to model processes within the conduit. During 2005, various Vulcanian explosions of a relatively large magnitude were witnessed. Each was preceded by a swarm of low amplitude events, mostly of low frequency. The relationship between these events and the subsequent explosion is being investigated.

MC Gabriel Reyes-Davila, RESCO, Universidad de Colima