Mass variations in response to magmatic stress changes at Soufrière Hills Volcano, Montserrat (W.I.): Insights from 4-D gravity data

Details Mass variations in response to magmatic stress changes at Soufrière Hills Volcano, Montserrat (W.I.): Insights from 4-D gravity data Mass variations in response to magmatic stress changes at Soufrière Hills Volcano, Montserrat (W.I.): Insights from 4-D gravity data

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010e%26psl.290...83h&link_type=abstract

Earth and Planetary Science Letters, Volume 290, Issue 1-2, p. 83-89.

Physics

Scientific paper

The eruption of Soufrière Hills Volcano (Montserrat, West Indies) has been ongoing for more than a decade, yet routine monitoring of the activity did not include gravity surveillance for most of the time. In June/July 2006, we installed a new elevation-controlled microgravity network, which we re-occupied in January/February 2007 and August/September 2008. Residual gravity changes of up to 74 µGal between the surveys allow us to infer net mass and/or density changes beneath the central part of the island. Data inversion for causative source parameters indicates mass changes along NW-SE elongated structures beneath the Centre Hills at a minimum depth of 700 m. We suggest the observed gravity variations to be related to poroelastic dynamics involving groundwater migration and/or fracture opening/closing along a hitherto unrecognized fault zone. The perturbations appear to be triggered by changes in the stress field of the shallow plumbing system of Soufrière Hills Volcano.

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