• Principal Investigators:
  Dr. Glen Mattioli, Dr. Pam Jansma
• UNAVCO Engineers: Abe Morrison, Liz Van Boskirk (UNAVCO)
• Dates: April 2012
• Location: Multiple locations around Montserrat
• Funding Source: NASA-Earth Surface and Interior and NSF-EAR: Earth Sciences: Instrumentation and Facilities

Written by Abe Morrison
9 January 2013

Overview

In April of 2012, two engineers from UNAVCO conducted a maintenance trip to the Island of Montserrat to service four stations that house continuous GPS systems and borehole strain meters. These four stations were originally installed on the island between 2002 and 2004 as part of the Caribbean Andesite Lava Island Precision Seismo-geodetic Observatory (CALIPSO) project. The instrumentation power systems and data communication infrastructure at these stations has continually been upgraded over the life of this project. While on the island, the UNAVCO engineers also installed two new continuous GPS stations funded by NASA, including one station in the island’s exclusion zone to the southeast of the volcano and another at the extreme northern tip of the island.

Significance

Observed deformation of Soufriere Hills Volcano (SHV) provides an excellent example of the broad continuum of temporal and spatial scales of volcanic edifice failure, including:

1. Island-wide inflation and deflation cycles, observed over the 1995-2007 period
2. The catastrophic Boxing Day sector collapse of December 1996
3. Large and rapid edifice deformation associated with the massive dome collapse of July 2003

Examination of these three case studies will shed light on the relative contributions of endogenous as well as exogenous processes that contribute to and eventually result in edifice collapse on all arc volcanoes.