CRUSTAL AND UPPER MANTLE VELOCITY & Q STRUCTURES OF MAINLAND CHINA

摘要

New data from the Seismological Research Observatory (SRO) is used in conjunction with a nonlinear 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. (Author)