2024-03-29T02:07:45Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/342832019-11-13T07:59:13Zcom_10261_87com_10261_8col_10261_340
2011-04-05T11:09:03Z
urn:hdl:10261/34283
Mass variations in response to magmatic stress changes at soufrière Hills Volcano Montserrat (W. I.): insights from 4-D gravity data
Hautmann, S.
Gottsmann, Joachim
Camacho, Antonio G.
Fournier, N.
Sacks, I. S.
Sparks, R. Stephen J.
Dynamic gravity
Soufrière Hills Volcano
Fault zone
Fluid migration
Volcano-tectonic interaction
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.
2011-04-05T11:09:03Z
2011-04-05T11:09:03Z
2010-02-15
artículo
Earth and Planetary Science Letters 290 (1-2): 83-89 (2010)
0012-821X
http://hdl.handle.net/10261/34283
10.1016/j.epsl.2009.12.004
1385-013X
eng
http://dx.doi.org/10.1016/j.epsl.2009.12.004
closedAccess
Elsevier