Investigation of inhomogeneities and anisotropy in the crust and upper mantle of central Europe by means of teleseismic P waves

Details Investigation of inhomogeneities and anisotropy in the crust and upper mantle of central Europe by means of teleseismic P waves Investigation of inhomogeneities and anisotropy in the crust and upper mantle of central Europe by means of teleseismic P waves

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pepi...51..169w&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 51, Issue 1-3, p. 169-178.

Physics

6

Scientific paper

Travel-time residuals from global samples as well as azimuth and slowness deviations of teleseismic P-wave arrivals have been analysed both at the individual seismic stations BRG, CLL, MOX, and PRU, and using the G.D.R. station network.
The main results of the analysis are as follows.
(1) Azimuth and incidence-angle deviations of short-period P waves have been observed at individual stations by means of three-component measurements. Their transformations into the slowness space reveal a mislocation pattern at all stations, which suggests the superimposition of regional and strong local effects on wave propagation.
(2) The mean station residuals, as well as the azimuth dependence of the residuals with a period of 2π, indicate a rising of the upper mantle discontinuities to the north of central Europe to the east European platform.
(3) This general trend is confirmed by the mislocation patterns observed at various subnetworks of the telemetric system of seismic stations of the G.D.R. The refined model assumes a dipping of flat discontinuities or isotachs in the upper mantle down to the 20° discontinuity, with a dip angle of about 11° +/- 2° north of the network centre and a zero dip south of it. The dip direction is 192° +/- 5°.
(4) Fourier analysis of the azimuth dependence of travel-time residuals revealed almost the same phase of the second azimuthal term at all individual stations. This fact could be interpreted in terms of an anisotropic layer of some 200 km thickness in the upper mantle assuming a coefficient of anisotropy of 6%. The azimuth of maximum velocity is 10° (+180°) and agrees well with the results derived by Bamford (1977) from Pn-wave measurements.

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