HR: 0800h
AN: T51A-02    [Abstracts]
TI: The Deep Seismic Structure of Volcan de Colima, Mexico
AU: * Gardine, M D
EM: mgardine@gi.alaska.edu
AF: Geophysical Institute, University of Alaska Fairbanks, 903 Koyukuk Dr., Fairbanks, AK 99775, United States
AU: Dominguez, T
EM: tonatiuh@cgic.ucol.mx
AF: Observatorio Vulcanologico de la Universidad de Colima, Av. Gonzalo de Sandoval 444, Colima, Col 28045, Mexico
AU: West, M E
EM: west@gi.alaska.edu
AF: Geophysical Institute, University of Alaska Fairbanks, 903 Koyukuk Dr., Fairbanks, AK 99775, United States
AU: Grand, S P
EM: steveg@geo.utexas.edu
AF: Jackson School of Geosciences, University of Texas at Austin, 1 University Station C1100, Austin, TX 78712, United States
AU: Suhardja, S K
EM: s4ndy104@yahoo.com
AF: Jackson School of Geosciences, University of Texas at Austin, 1 University Station C1100, Austin, TX 78712, United States
AB: We present early-stage results from a novel seismic investigation at Volcan de Colima. The project is a collaboration between the Observatorio Vulcanologico de la Universidad de Colima and the University of Alaska Fairbanks. In January 2006, twenty broadband seismometers were deployed in a wide-aperture array around the volcano as part of the IRIS/PASSCAL-supported Colima Volcano Deep Seismic Experiment (CODEX). They are scheduled to be in the field for twenty-four months. Data from the first several months of the deployment, integrated with data from the Mapping of the Rivera Subduction Zone (MARS) project (see abstract by Grand et al.), have been used to characterize both the regional seismicity and the seismicity of the volcano. Overall patterns of regional seismicity agree well with the real-time RESCO network (see abstract by Dominguez). Colima volcano has an unusually well-distributed suite of earthquakes on the local, regional and teleseismic scale. Data recorded close to the edifice provide an opportunity to explore the daily explosive activity exhibited by the volcano. The diversity of regional and teleseismic earthquake source regions make Colima an ideal place to probe the deep magmatic structure of a prodigous volcanic center. Striking differences in attenuation of some body wave phases at stations east of the volcano versus those west of the volcano due to travel path differences hint at the geological complexity of the area in the deep crust. Results from the seismic investigation will be interpreted in the context of pre-existing petrologic models to address the relative role of crust and mantle in governing the evolution of an andesitic arc volcano.
DE: 7205 Continental crust (1219)
DE: 7230 Seismicity and tectonics (1207, 1217, 1240, 1242)
DE: 7280 Volcano seismology (8419)
DE: 8178 Tectonics and magmatism
SC: Tectonophysics [T]
MN: 2007 Joint Assembly