Fig. 1From: Ambient noise multimode surface wave tomographya Construction of reference 1-D models. b Phase/group velocity measurements for each path. c 2-D phase/group velocity inversions for multimodes. d A 3-D S-wave tomographic model is obtained from a collection of local 1-D inversions at all the grids. Modified from Takagi and Nishida (2022)Back to article page