A Surface Wave Study of the South-China Subplate
UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES GEOPHYSICS LAB
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New data from the Seismological Research Observatory SRO is used in conjunction with a non-linear least squares technique to invert surface wave group velocity data for the shear velocity structure of the South-China subplate. A multi-filter analysis was used to produce group velocities for the fundamental mode Love and Rayleigh wave. A number of earthquakes over a single path are used in order to deduce a measure of the observational uncertainty of the present method. Group velocity standard deviations range from .03 to .1 km sec for Love waves over the period range of 10 to 65 seconds. Results of the inversion indicate that a 3 layer, 40 km thick crust is an adequate model consistent with the data for the South-China subplate. Crustal shear velocities are found to be higher and upper mantle shear velocities lower than previously reported values for this region.
- Geology, Geochemistry and Mineralogy