Crustal and Upper Mantle Velocity and Q Structures of Mainland China
Abstract
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 wave velocity structure for paths crossing the Chinghai-Tibet, North China and South China subplates. A number of earthquakes are used over a single path in order to deduce a measure of the observational uncertainty. Group velocity standard deviations range from 0.04 km/sec to 0.20 km/sec for Rayleigh waves and 0.04 km/sec to 0.20 km/sec for Love waves over the period range 10-128 seconds. The results of the inversion indicate a 4 layer total, 70 km thick crust is an adequate model for the Tibetan plateau. Group velocities obtained for the path crossing the Tibetan plateau are unusually low. Group velocities for the mixed path between Tangshan-Mashad, Iran are lower than the average continental dispersion. Results of the inversion indicate a 3 layer total, 45 km thick crust is an adequate model. Group velocities for the path between Tangshan-Taipei, Taiwan are closest of the three regions (at higher periods) to the average continental dispersion. Results of the inversion indicate that a 3 layer total, 30 km crust is an adequate model. Shear velocities derived from the inversion of group velocity data are presented for the crust and upper mantle for each path.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1977
- Accession Number
- ADA054288
Entities
People
- Ira Pines
- Ta-liang Teng
Organizations
- University of Southern California