HR: 08:45h
AN: T51C-04    [PDF]
TI: Integrating Seismological Studies of Crustal Structure in the Northern California Coast Ranges to Construct a Regional 3D Strain Model
AU: * Hayes, G P
EM: ghayes@geosc.psu.edu
AF: Department of Geosciences, 542 Deike Building, University Park, PA 16802 United States
AU: Furlong, K P
EM: kevin@geodyn.psu.edu
AF: Department of Geosciences, 542 Deike Building, University Park, PA 16802 United States
AU: Schwartz, S Y
EM: sschwartz@earthsci.ucsc.edu
AF: Earth Sciences Department, University of California, Santa Cruz, CA 95064
AU: Ammon, C J
EM: cammon@geosc.psu.edu
AF: Department Of Geosciences, 440 Deike Building, University Park, PA 16802 United States
AU: Hall, C
EM: chall@earthsci.ucsc.edu
AF: Earth Sciences Department, University of California, Santa Cruz, CA 95064
AB: The Coast Ranges of California has been the target of a number of recent seismological studies aimed at constraining various aspects of crustal architecture. The combination of techniques used provides a suite of complimentary constraints; the active source Mendocino seismic experiment gave 2D velocity data and delineated interfaces from reflectivity, while tomography provided a smoothed 3D velocity picture. Receiver function studies have characterized crustal interfaces and provide information on the nature of the velocity contrasts across these interfaces. This latter information is key in determining the way in which processes driven by the passage of the Mendocino Triple Junction have driven crustal evolution of the Coast Ranges. Combining the results of these various studies, we test models of thickening and subsequent thinning of the crust in response to the Mendocino crustal conveyor. Specifically we use crustal structure models from receiver functions generated at a number of stations in the region, combined with the 3D tomography of the area, to develop a model of crustal architecture over the entire Coast Ranges. Analyzing these results within the framework of the Mendocino crustal conveyor model allows us to move beyond simply describing the structure; rather it allows us to develop a 3D model of present-day crustal strain that provides constraints on mechanical properties of the Coast Ranges crust, where shear zones develop within that crust, and the role they may play in the evolution of the San Andreas Fault system.
DE: 8123 Dynamics, seismotectonics
SC: Tectonophysics [T]
MN: 2003 Fall Meeting