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Magma plumbing processes for persistent activity at Poás Volcano, Costa Rica

Rymer, Hazel; Locke, Corinne A.; Brenes, Jorge and Williams-Jones, Glyn (2005). Magma plumbing processes for persistent activity at Poás Volcano, Costa Rica. Geophysical Research Letters, 32(8) L08307.

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New microgravity data from the active crater of Poás volcano, Costa Rica, collected in 2002-2004 extends the existing dataset to provide a unique 20-year time series. These data show that gravity has decreased monotonically in the north and east of the crater over the last 5 years, whilst it has increased to the west and remained approximately constant in the south. These changes are interpreted in terms of convective recharge within dendritic intrusions beneath the crater, with overall down-welling in the north and up-welling in the west. The data reveal a 5-10 year periodicity in sub-crater mass movement, but overall, the upper part of the conduit system appears to have maintained a state of mass equilibrium.

Item Type: Journal Article
ISSN: 0094-8276
Keywords: microgravity; mass movement; Poás volcano; persistent activity
Academic Unit/Department: Science > Environment, Earth and Ecosystems
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 67
Depositing User: Users 12 not found.
Date Deposited: 10 May 2006
Last Modified: 03 Dec 2010 13:49
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