Physics – Geophysics
Scientific paper
Aug 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3115602f&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 15, CiteID L15602
Physics
Geophysics
1
Exploration Geophysics: Gravity Methods, Volcanology: Magma Migration, Volcanology: General Or Miscellaneous
Scientific paper
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.
Brenes Jorge
Fournier Nicolas
Rymer Hazel
Williams-Jones Glyn
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