Since its development and first applications in the late 1970s (e.g., Aki and Lee, 1976; Aki et al., 1977; Dziewoński et al., 1977), seismic tomography has developed into one of the most powerful tools to investigate the internal structure of the Earth from local to global scales. Tomographic Earth models have become increasingly detailed, thanks to the continuous densification of the global station network (e.g., Roult et al., 2010; Gee and Leith, 2011), the installation of dedicated arrays (e.g., SKIPPY, van der Hilst et al., 1994; USArray, www.usarray.org, last...

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