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Pressure sources versus surface loads: Analyzing volcano deformation signal composition with an application to Hekla volcano, Iceland
Author(s) -
Grapenthin Ronni,
Ófeigsson Benedikt G.,
Sigmundsson Freysteinn,
Sturkell Erik,
Hooper Andrew
Publication year - 2010
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2010gl044590
Subject(s) - geology , volcano , lava , deformation (meteorology) , lava dome , magma , seismology , petrology , dome (geology) , magma chamber , pressure gradient , geomorphology , oceanography
The load of lava emplaced over periods of decades to centuries induces a gradual viscous response of the Earth resulting in measurable deformation. This effect should be considered in source model inversions for volcanic areas with large lava production and flow emplacement in small centralized regions. If deformation data remain uncorrected, constructive load and pressure source interference may result in an overestimate of depth and volume of a magma reservoir whereas destructive signal interference may cause these values to be underestimated. In both cases the source geometry preference could be biased. The ratio of horizontal and vertical displacements aids the identification of composite signals. We provide a method to quantify and remove the lava load deformation signals, using deformation at Hekla volcano, Iceland as an example.