Online material: Simple Matlab script to plot Moho profiles; continuous Moho surface; data points used to estimate the Moho surface.

The Mohorovičić discontinuity (Moho) is a globally identifiable boundary between the crust and the uppermost mantle (Dziewonski and Anderson, 1981). It is detected using seismic techniques, such as reflected energy from local earthquakes (e.g., Richards-Dinger and Shearer, 1997) or active-source experiments (e.g., Christeson et al., 2010) or from crustal reverberations of waves from distant earthquakes (e.g., Burdick and Langston, 1977; Zhu and Kanamori, 2000).

Locally, the Moho surface may exhibit complexity in...

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