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Broadband Seismic Noise Analysis of the Soufrière Hills Volcano Network

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	INTRODUCTION

 
The Soufrière Hills Volcano (SHV), Montserrat, West Indies, is an active andesitic dome-building volcano at the northern end of the Lesser Antilles volcanic arc. The ongoing eruption, characterized by cyclic growth and collapse of an andesite lava dome with associated pyroclastic flows (PF), vulcanian explosions, and debris flows, began on 18 July 1995 (Young et al. 1998; Aspinall et al. 1998) after a three-year period of precursor seismic activity.

Prior to this eruption, volcanic activity in Montserrat was monitored by the Seismic Research Unit (SRU), based at the University of West Indies, St. Augustine, Trinidad, as part of its regional seismic network, with two stations located on-island. In 1994, prompted by the increased seismic activity, SRU expanded the seismic network on Montserrat by installing four additional stations (Luckett et al. 2007). During July 1995, coincident with the onset of phreatic activity at SHV, the U.S. Geological Survey installed three seismic stations (Power et al. 1998) to complement the existing network. In October 1996, the British Geological Survey (BGS) established a new digital seismic network of broadband instruments. The configuration of the SHV digital network has changed through the years until its latest upgrade in 2005. The present SHV digital seismic network (figure 1) consists of eight broadband, three-component Guralp CMG-40T seismometers and two short-period, vertical-component Mark Products L4 (Luckett et al. 2007). Seismic data are digitized onsite by Guralp DM24 24-bit digitizers and time-stamped using GPS clocks. Continuous data are telemetered from the sites using spread spectrum Freewave radio modems operating at 900 Mhz. Two repeater sites facilitate data transmission to the observatory where they are archived and analyzed. A detailed description of the history of the seismic network at SHV and its present configuration can be found in . . . [Full Text of this Article]

Montserrat Volcano Observatory
Flemmings, Montserrat, West Indies
silvio@mvo.ms