Accession Number:

ADA070014

Title:

A Surface Wave Dispersion Study of the Crustal and Mantle Structure of China

Descriptive Note:

Interim rept.

Corporate Author:

UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES GEOPHYSICS LAB

Report Date:

1979-05-01

Pagination or Media Count:

75.0

Abstract:

Repeated surface wave group velocity measurements over the same paths were made by using large aftershocks of several great M greater than 7 earthquakes recently occurred in China. Multiple filter technique was applied to the properly rotated three-component digital data from Seismological Research Observatory SRO stations, so that both Rayleigh- and Love-wave dispersion data were obtained over a number of paths crossing various tectonic provinces of China. In several cases, higher mode data were also derived. An estimate of uncertainty of these dispersion data was obtained from the repeated measurements with identical source-receiver geometry. The generalized surface wave inversion technique was applied to these multi-mode dispersion data, and crustal and upper mantle structures were derived for various tectonic provines of China. The results clearly demonstrate that the Chineses Mainland is far from being laterally homogeneous, the lateral heterogeneities are closely related to the past tectonic developments. A particularly unusual crustal and upper mantle structure is found underlying the Tibet plateau. Author

Subject Categories:

  • Seismology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE