HR: 1340h
AN: T43B-1410    [Abstracts]
TI: Seismic structure from multi-channel seismic reflection and wide-angle data of Transect 0E in the Southern Gulf of California
AU: * P ramo, P
EM: paramo@uwyo.edu
AF: University of Wyoming, Dept of Geology and Geophysics, Laramie, WY 82071
AU: Holbrook, W
EM: steveh@uwyo.edu
AF: University of Wyoming, Dept of Geology and Geophysics, Laramie, WY 82071
AU: Brown, H
EM: hbrown@uwyo.edu
AF: University of Wyoming, Dept of Geology and Geophysics, Laramie, WY 82071
AU: Lizarralde, D
EM: danl@eas.gatech.edu
AF: Georgia Tech, School of Earth and Atm. Sci., Atlanta, GA 30332
AU: Fletcher, J
EM: jfletche@cicese.mx
AF: CICESE, Dept. of Geology and Geophysics, Ensenada, 22860 Mexico
AU: Umhoefer, P
EM: paul.umhoefer@nau.edu
AF: Northern Arizona Univ., Dept. of Geology, Flagstaff, AZ 86011
AU: Kent, G
EM: gkent@ucsd.edu
AF: Scripps, IGPP, La Jolla, CA 92037
AU: Harding, A
EM: aharding@ucsd.edu
AF: Scripps, IGPP, La Jolla, CA 92037
AU: Gonzalez, A
EM: mindundi@cicese.mx
AF: CICESE, Dept. of Geology and Geophysics, Ensenada, 22860 Mexico
AU: Axen, G
EM: gaxen@dino.ess.ucla.edu
AF: UCLA, Dept. of Earth and Space Sciences, Los Angeles, CA 90095
AB: We present a velocity model from wide-angle data along with coincident prestack depth migration sections from seismic reflection data collected in the southern Gulf of California. Transect 0E runs NE to SW from the hills of Sierra Madre in mainland Mexico near Mazatl n to approximately 115 km into Gulf of California waters. Wide-angle data were recorded by 9 ocean bottom seismometers, deployed by the R/V New Horizon and 10 Reftek seismometers located along onshore extension of the transect. The average spacing for the OBS and Refteks is ~12 km and shots were fired from the R/V Maurice Ewing at 150 m intervals. Transect 0E crosses what it is believed to be extended continental crust and lies in the initial direction of extension characteristic of the proto-gulf. Preliminary results from the velocity model show upper crustal velocities of 6.1-6.3 km/s and lower crustal velocities of 6.7-7.0 km/s along the entire transect. Seismic velocities and crustal thicknesses observed along transect 0E are characteristic of non-volcanic margins.
DE: 8105 Continental margins: divergent (1212, 8124)
SC: Tectonophysics [T]
MN: Fall Meeting 2005