Online material: Complete list of earthquakes used in this study.

Three-component ground-motion recordings are critical to modern seismic analysis techniques such as receiver functions and body- and surface-wave polarization studies. Modern three-component seismometers typically resolve three axes of ground motion into one vertical and two orthogonal horizontal directions. The standard convention for installation is to orient the instrument such that one of the horizontal components is aligned with true north, taking into account the current local magnetic declination at the station. This practice can be difficult in the case of borehole instruments and practically impossible for ocean-bottom seismometers (OBS). Some...

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