Theoretical amplitudes of body waves from a dislocation source in the earth III. P,S and surface reflections |
| |
| Authors: | Yehuda Sylman Michael Shimshoni Ari Ben-Menahem |
| |
| Institution: | Department of Applied Mathematics, The Weizmann Institute of Science, Rehovot, Israel |
| |
| Abstract: | Expressions are obtained for the ray-theoretical spectral amplitudes of body waves induced by a shear dislocation of arbitrary orientation and depth situated in a radially heterogeneous model of the earth. Account is taken of the azimuthal and colatitudinal radiation patterns of the source, the geometrical spreading, and the reflections and refractions at the free surface and at the mantle-core boundary.In this work spectral amplitudes are calculated for P, SH, SV, PP, PPP, PS, PSS, SP, SPP, SSH, SSSH, SSV, and SSSV. The results are presented in the form of tables for a source of strength U0dS = 1015cm3, where U0 is the amount of the dislocation and dS is the fault area. Given the slip and dip angles of the source, the amplitudes of these surface reflections and direct phases can be obtained from these tables for all azimuths, for most of the epicentral distances at which a particular phase is observable, and for all the fourteen focal depths included in the Jeffreys-Bullen tables. It is found that the depth of the source has a strong effect on the amplitudes of the body wave signals. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
