Rayleigh wave group velocities at periods of 6–23 s across Brazil from ambient noise tomography

Maps of Rayleigh wave group velocity are presented across Brazil at periods between 6 and 23s from seismic noise tomography. This range is complementary to previous continent-scale tomographic studies, which generally focus on periods longer than 10s. By cross-correlating ambient noise recorded at 53 stations from 1996 to 2012, we produce empirical Green's functions between about 550 pairs of st...