ISSN:
1365-246X
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Geosciences
Notes:
Teleseismic body waves represent a natural tool for the investigation of Earth structure, but most studies have used only a very small part of the available information. We present a general procedure for the interpretation of body wave seismograms, which allows us to incorporate information from the entire set of body wave arrivals, and which is based on a new method for the calculation of synthetic seismograms. These ‘Complete Ordered Ray Expansion’ (CORE) seismograms are both complete, in the sense of incorporating all significant energy contributions, and interpretable, in the sense that we can identify all such contributions explicitly.We show how our procedure can form the basis for a waveform inversion scheme, exploiting the natural division of body wave arrivals into main phases associated with smooth structure, and families of interaction phases associated with discontinuities. We present the results of applying this technique to the Moho beneath various RSTN and DWWSSN stations, showing that it is possible to obtain very consistent values of crustal thickness from single deep focus events, using phases associated with both the P and S arrivals. By incorporating such arrivals in a linearized waveform inversion, we also obtain estimates of a mean Poisson's ratio for the crust.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1365-246X.1991.tb02493.x
Permalink