Isotropic and anisotropic Pn velocity inversion of regional earthquake traveltimes underneath Germany

Details Isotropic and anisotropic Pn velocity inversion of regional earthquake traveltimes underneath Germany Isotropic and anisotropic Pn velocity inversion of regional earthquake traveltimes underneath Germany

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001geoji.146..795s&link_type=abstract

Geophysical Journal International, Volume 146, Issue 3, pp. 795-800.

Astronomy and Astrophysics

Astronomy

4

Earthquake Traveltimes, Germany, Seismic Velocity Anisotropy, Upper Mantle

Scientific paper

This paper investigates the uppermost mantle velocity beneath Germany using regional earthquake traveltime data. 2149 Pn traveltimes corresponding to 220 events recorded at 70 stations covering the region of 47°N-52°N latitude, 5°E-15°E longitude result in a satisfactory ray-path distribution. Three methods with increasing degree of complexity are used to analyse the Pn traveltime data: a straight-line fit; the classical time-term method; and a modified time-term method including azimuthal anisotropy. First, from the straight-line fit to the data set, an average Pn velocity of 7.98kms-1 is inferred. Second, the classical time-term method yields a mean uppermost mantle velocity of 7.99kms-1. The most important feature in this analysis is the azimuth-dependent pattern of the residuals, indicating some evidence of velocity anisotropy in the upper mantle. The time-term method achieves about 55 per cent variance reduction relative to the straight-line fit. Third, two modified `anisotropic' time-term methods provide an average Pn velocity of 8.09kms-1, with a further data variance reduction of 64 and 20 per cent relative to the straight-line fit and the classical time-term method, respectively. The estimated anisotropy level is about 3.5-4 per cent, with maximum and minimum velocities of 8.24-8.27kms-1 and 7.95kms-1. Our estimated maximum velocity direction of ~N25°E coincides with those of previous anisotropic studies on the uppermost mantle in this region based on seismic refraction data. The results from the present study thus support the idea that Pn-wave anisotropy is a large-scale lithospheric feature over much of central Europe.

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