The orientation of seismic instruments relative to north is a critical parameter in many seismological applications. Three‐dimensional studies of surface‐wave dispersion depend on accurate seismic sensor orientation (Ekström et al., 1997). This parameter is also important in the study of off‐great‐circle propagation of long‐period surface waves (Laske, 1995), as well as in estimates of the anisotropic structure of the mantle using SKS splitting observations (Long et al., 2009). Finally, sensor orientation is critical in the comparison of observed and synthetic records in seismic source studies. In a recent study of southern Iberia...

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