The high-frequency content observed in teleseisms recorded by seismometers can be produced either by the nonlinear behavior of seismometers and digitizers (Delorey et al. 2008; Hellweg et al. 2008) or by the real Earth response. The latter include scattering from small-scale heterogeneities during seismic wave propagation (e.g., Chen and Long 2000) and high-frequency radiations from the earthquake source (e.g., Peng et al. 2006) or near-surface regions near the recording site (Fischer et al. 2008). Recent studies have shown that large-amplitude surface waves generated by earthquakes at regional and teleseismic...

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