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• July 6, 2018

It has been known that Po waveforms are complicated due to high-frequency scattering within the mantle, but Tonegawa et al. (2018) attempted to retrieve Po-to-s (Pos) waves converted at crust-related interfaces by cross-correlating Po wave coda from the radial and vertical components. As a result, their results successfully showed the retrieval of Pos waves from the basement and oceanic Moho, and also demonstrated the effectiveness of this new approach by revealing lateral variations of Pos-wave emergence and layer-dependent shear wave anisotropy from the outer-rise to seaward regions.