HR: 08:50h
AN: V11B-04    [PDF]
TI: The magma reservoir of Mauna Loa volcano, Hawaii: Constraints from InSAR geodetic measurements
AU: * amelung, f
EM: amelung@rsmas.miami.edu
AF: Rosenstiel School, University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149 United States
AU: Miklius, A
EM: asta@usgs.gov
AF: U.S. Geological Survey, Hawaii Volcano Observatory, Hawaii National Park, Volcano, HI 96817 United States
AU: Walter, T R
EM: twalter@rsmas.miami.edu
AF: Rosenstiel School, University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149 United States
AB: Mauna Loa volcano in Hawaii is among the most active volcanoes on Earth and a natural laboratory for volcano dynamics. Geodetic measurements of the deformation of the volcanic edifice before, during, and after the last eruption in 1984 have profoundly formed our understanding of how basaltic volcanoes work. After a ~10 year period of summit deflation, a new episode of summit inflation on Mauna Loa volcano started in May 2002. Continuous GPS measurements detected lengthening of a baseline across the summit caldera at a rate of ~20 cm/yr. The rate of lengthening decreased in November 2002 to ~8 cm/yr. Summit inflation is caused by the arrival of new magma in the summit reservoir and provides an opportunity to constrain key features of this magma reservoir. We present interferometric geodetic data of this inflation period and discuss elastic models to constrain the location, shape, and size of the magma reservoir. The data are derived from imagery acquired by the Radarsat satellite which is imaging the volcano with 6 different viewing geometries since 1997. The interferograms show up to ~10 cm inflation since May 2002. The center of inflation is located ~4 km east of the summit caldera. This suggests that this is also the location of the magma reservoir and that the volcano does not has a central magma reservoir beneath the summit caldera.
DE: 3045 Seafloor morphology and bottom photography
DE: 3640 Igneous petrology
DE: 8015 Local crustal structure
DE: 8499 General or miscellaneous
DE: 9355 Pacific Ocean
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2003 Fall Meeting