Shear velocity structure beneath the Iberian Massif from broadband Rayleigh wave data

Details Shear velocity structure beneath the Iberian Massif from broadband Rayleigh wave data Shear velocity structure beneath the Iberian Massif from broadband Rayleigh wave data

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pepi...79..349c&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 79, Issue 3-4, p. 349-365.

Physics

7

Scientific paper

Up to a few years ago, dispersion analyses of surface waves across the Iberian Peninsula and adjacent zones were based on analog data recorded at the long-period Iberian stations. The installation of the NARS array on Iberian territory for a period of one year, has provided a greater station density than was previously available with the very few permanent long-period seismological stations installed on the peninsula. The NARS array also provided quality digital records, and increased the path coverage for two-station surface wave velocity measurements. Fundamental mode Rayleigh waves recorded at broadband stations belonging to this array have been analyzed to produce phase and group velocity dispersion curves for the period range 10-90 s. With the dataset now available, the elastic structure beneath the Iberian Massif has been investigated in terms of the shear velocity distribution as a function of depth. Time-variable filtering is employed to remove higher mode interference efficiently and to improve isolation of the fundamental mode Rayleigh wave from the seismograms. Multiple filtering is then used to compute group velocities at each station. The interstation Rayleigh wave group velocity can thus be easily calculated. Frequency-domain Wiener deconvolution is used to determine the interstation phase velocity. We perform inversion of velocity dispersion data containing both Rayleigh wave phase velocities and group velocities according to the generalized inversion theory by means of the stochastic inverse operator. The theoretical models for the lower crust and uppermost mantle beneath the Iberian Massif obtained by joint inversion, show a continental lithosphere with a thickness of 81 km. The crustal and subcrustal velocities are greater than in other areas of the Iberian Peninsula. The asthenosphere appears as a layer 100 km thick defined by very low velocities when compared with the rest of the peninsular area. Both the lithosphere and the asthenosphere exhibit a low velocity channel. In the lithosphere a subcrustal low velocity channel has velocity constrained between 4.33 and 4.62 km s-1. In the asthenosphere the low velocity channel is constrained between 4.13 and 4.36 km s-1.

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