[24] We are grateful to M. Bruneton, who kindly provided us with data on phase velocities of surface waves. Data on tps410 traveltimes from SVEKALAPKO records were obtained by I. M. Aleshin and G. L. Kosarev during their visit to Oulu University at the invitation of E. Kozlovskaya (research grant of the Finnish Academy of Sciences, 2004). Experimental observations with the RUKSA array were supported by the INTAS grant 97-0936 and the Zurich ETH Institute (Switzerland). This work was supported by the Russian Foundation for Basic Research, projects nos. 03-05-64654, 04-05-64634, and 04-07-90362-B.
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