TY - JOUR
T1 - Geodetic constraints on the shallow magma system at Soufrière Hills Volcano, Montserrat
AU - Widiwijayanti, Christina
AU - Clarke, Amanda
AU - Elsworth, Derek
AU - Voight, Barry
PY - 2005/6/16
Y1 - 2005/6/16
N2 - Ground surface tilts recorded proximal to a growing lava dome, and sustained through repeated dome collapses, provide unique geodetic constraints on the depth, size, and overpressures of the shallow magmatic system at Soufrière Hills Volcano. Tilt records identify a single pressure-source inflating with periods ∼3-30 h. Sustained tilt amplitude ratios for paired stations identify the pressure-source at a centroid depth between ∼740 and 970 m. This pressure-source and its robust oscillatory response survived a dome collapse that removed the upper ∼200 m of the magmatic system. Shallow overpressures of 1-4 MPa are confirmed over a radius of 200-340 m; this size suggests pressurization of a fluid-saturated fractured rock mass annulus surrounding a narrow magma conduit.
AB - Ground surface tilts recorded proximal to a growing lava dome, and sustained through repeated dome collapses, provide unique geodetic constraints on the depth, size, and overpressures of the shallow magmatic system at Soufrière Hills Volcano. Tilt records identify a single pressure-source inflating with periods ∼3-30 h. Sustained tilt amplitude ratios for paired stations identify the pressure-source at a centroid depth between ∼740 and 970 m. This pressure-source and its robust oscillatory response survived a dome collapse that removed the upper ∼200 m of the magmatic system. Shallow overpressures of 1-4 MPa are confirmed over a radius of 200-340 m; this size suggests pressurization of a fluid-saturated fractured rock mass annulus surrounding a narrow magma conduit.
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U2 - 10.1029/2005GL022846
DO - 10.1029/2005GL022846
M3 - Article
AN - SCOPUS:23844468439
SN - 0094-8276
VL - 32
SP - 1
EP - 5
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 11
ER -