Sudden disturbances in strong‐motion acceleration records, referred to as baseline offsets, are well known (Boore et al., 2002; Javelaud et al., 2011). The physical nature of this phenomenon remains unclear, although some cases are well explained by a permanent ground tilt (Graizer, 2010; Javelaud et al., 2012). The ground tilt may be caused by near‐field source effects or a local tilt at a station produced by seismic vibrations in highly heterogeneous substrata (i.e., strong gradients of material properties at small scales). Tilts are frequently observed in volcanic areas (Wielandt and...
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