Automated surface wave dispersion measurements and surface wave tomography of central and northern Europe
We automated the inter-station method. The method automatically selects smooth parts of phase velocity dispersion curves for all the events in one inter-station path, an average dispersion curve is obtained for each inter-station path after statistical analysis of individual measurements. We applied the method to a huge data-set covering almost entire Europe and obtained phase velocity measurements in broad period range from 8s to more than 250 s for both Love and Rayleigh waves. We used phase velocity measurements in tomographic inversion and obtained high quality very broad band phase velocity maps for central and northern Europe. Synthetic reconstruction tests reveal that the regions with dense path coverage possess a lateral resolution of about 100 km to 150 km. The low period phase velocity maps clearly image the central European basin system (CEBS). At intermediate periods (e.g. around 60 s) Trans - European Suture zone marks a clear and distinct boundary between old and cold East European Craton with that of younger Phanerozoic central Europe. The boundary is sharp beneath the TTZ (Tornquist- Teisseyre Zone) on the south-estern part of the TESZ, where as gradual transition towards the north western part of the TESZ i.e. STZ (Sorgenfrei-Tornquist Zone). European slab is imaged clearly at western Alps and is visible at the periods from 40s to 120s.
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