Physics – Geophysics
Scientific paper
Apr 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998georl..25.1043a&link_type=abstract
Geophysical Research Letters, Volume 25, Issue 7, p. 1043-1046
Physics
Geophysics
12
Geodesy And Gravity: General Or Miscellaneous, Mathematical Geophysics: Modeling, Tectonophysics: Physics Of Magma And Magma Bodies, Tectonophysics: Plate Boundary-General
Scientific paper
A decade-long plate-boundary rifting episode in northern Iceland ended with the September 1984 fissure eruption of Krafla volcano. We apply a nonlinear inversion method to geodetic data collected before and after the eruption to infer the location, geometry, and strengths of deformation sources associated with the eruption. The net outflow of magma from a 3-km-deep magma chamber beneath the Krafla caldera was 30-120×106m3. A similar volume of magma, 50-70×106m3, was emplaced in a 1-meter-wide, ~9-km-long dike extending from the surface to ~7 km depth. Furthermore, at least 110×106m3 of magma erupted. Accordingly, a surplus of magma must have been expelled from a second reservoir, the location of which, although uncertain, is likely to lie at depths greater than ~5 km beneath Krafla volcano. It would be difficult to detect this deeper source because of the narrow aperture of the geodetic networks.
Árnadóttir Thóra
Delaney Paul T.
Sigmundsson Freysteinn
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