HR: 11:20h
AN: G42A-05    [Abstracts]
TI: New Insights into the Magmatic Systems of Ocean Island Volcanoes from InSAR: Examples from Hawaii and the Galapagos.
AU: * Amelung, F
EM: famelung@rsmas.miami.edu
AF: University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149 United States
AU: Walter, T R
EM: twalter@rsmas.miami.edu
AF: University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149 United States
AU: Yun, S
EM: shyun@pangea.stanford.edu
AF: Department of Geophysics, Stanford University, Stanford, CA 94305 United States
AB: Oceanic island volcanoes are the most active volcanoes in the world. Many of them have shallow magma reservoirs and are actively deforming not only during but also in-between eruptions. Modes of deformation include the uplift of the volcanic edifice due to the intrusion of new magma into the magma reservoir and flank deformation related to flank instability and intrusion of magma into the rift zone. Here we present examples of volcano deformation from Hawaii and the Galapagos Islands. Mauna Loa volcano in Hawaii is inflating since May 2002. Modelling of InSAR data combined with GPS shows that the deformation is caused by the inflation of the shallow magma reservoir and rift zone widening, presumably because of the intrusion of new magma into the rift zone. We use data of the 2005 eruption of Fernandina volcano in the Galapagos islands to derive constraints about the geometry of the magmatic source and about the excess magma pressure in the volcanic plumbing system. We use stress change models to discuss the relation between the 1995 and the 2005 dikes. In particular we address the question whether the location of the 1995 eruption influenced the location of the 2005 eruption.
DE: 1243 Space geodetic surveys
DE: 8434 Magma migration and fragmentation
DE: 8485 Remote sensing of volcanoes
DE: 8494 Instruments and techniques
DE: 8499 General or miscellaneous
SC: Geodesy [G]
MN: Fall Meeting 2005