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A seismic network operated from December 2008 to November 2009 in south-central Chile covering the Chile subduction zone from c. 39°S to 40°S. This segment of the subduction zone includes the highly active Villarrica volcano and the maximum slip area of the 1960 Mw 9.5 earthquake. We applied surface wave dispersion analysis to data from a linear array of broadband stations and to records of four areal sub-arrays. Fifty regional and teleseismic events were used to produce dispersion curves of Rayleigh waves. From the dispersion curves, we determined depth functions of the shear-wave velocity for 4 subregions of...

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