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1. Introduction When an earthquake occurs, the elastic strain gradually accumulated for long time on either side of a fault is suddenly released. The elastic rebound generates the dynamic component of the motion and the static deformation of the ground. In the proximity of the source of large earthquakes, this tectonic displacement may be recorded by accelerometric instruments. The corresponding waveforms have characteristic shapes, producing a one-sided pulse in the velocity trace and an offset (fling-step) at the end of the displacement waveform (Figure 1a). The fling-step may be on the order of tens or hundreds of centimeters (Boore and Bommer 2005) and it is typically observed along the slip direction: it appears along strike-parallel direction for strike-slip faults (Kalkan et al., 2004), whereas it can be observed both in the strike-normal and vertical directions for dip-slip faults

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