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High-resolution gravity survey: Investigation of subsurface structures at Poás volcano, Costa Rica

Fournier, Nicolas; Rymer, Hazel; Williams-Jones, Glyn and Brenes, Jorge (2004). High-resolution gravity survey: Investigation of subsurface structures at Poás volcano, Costa Rica. Geophysical Research Letters, 31(8) L15602.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1029/2004GL020563
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Abstract

Bouguer gravity surveys have long been used to investigate sub-surface density contrasts. The main sources of error in previous surveys have been the determination of relative elevations of stations and the effect of topography (removed via the terrain correction). The availability of high precision Kinematic GPS data now facilitates generation of high-resolution Digital Elevation Models that can help to improve the accuracy of relative elevation determination and the terrain correction. Here we describe a high-resolution gravity survey at Poás volcano, Costa Rica. Our gravity modelling (i) identifies small pockets of magma at shallow depths which relate to successive magma intrusion through time and (ii) shows that the persistent degassing in the eastern part of the crater is related to local deformation at the top of the volcano and changes in the fracture network, rather than to the presence of a shallow magma intrusion.

Item Type: Journal Article
ISSN: 0094-8276
Academic Unit/Department: Science > Environment, Earth and Ecosystems
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 6861
Depositing User: Users 2315 not found.
Date Deposited: 16 Feb 2007
Last Modified: 02 Dec 2010 19:57
URI: http://oro.open.ac.uk/id/eprint/6861
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