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Modeling magmatic intrusion’s effects on the geoid and vertical deflection. Application to Lanzarote, Canary Islands, and Long Valley Caldera, California

AuthorsCharco, María CSIC ORCID; Fernández Torres, José CSIC ORCID ; Sevilla, Miguel J. CSIC; Rundle, J. B.
KeywordsGravity changes
Volcanic activity
Magmatic intrusion
Vertical deflection
Geoid height
Issue Date2002
PublisherUniversidad Complutense de Madrid
CitationFísica de la Tierra 2002, 14, 11-31
AbstractVolcanic activity produces ground deformation and gravity changes in response to geodynamic processes within the crust. Many of these precursors are measurable with present-day technology like precise surveying techniques or "high-technology" as those use in satellite-based geodesy (e.g. Global Positioning System). It is usually assumed that vertical deflection and geoid height needed for comparing such as techniques, are not significantly affected by the intrusion process. In this work, we have tested theoretically this assumption and applied to active zones with different crustal structures that resemble layered media, namely Lanzarote (Canary Islands, Spain) and Long Valley Caldera (California). Considering the geoid as an equipotential surface of the gravitational field we have used the elastic-gravitational deformation model, proposed by Rundle and Fernández, to compute geoid and vertical deflection changes produced by a magmatic intrusion in the crust. This technique represents the geoid and vertical deflection due to a point source, which therefore can be used as Green’s function with which to convolve an arbitrary distribution of subsurface mass or pressure change. The results show that the magma intrusion radius should be of approximately 1 km for the effects on both geoid undulations and vertical deflection not to be negligible. This radius would decrease for shallow intrusions. The pressure effects computed with the model, if we considered realistic pressure changes values, would be always negligible.
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