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The KiK-net ground motion database is used to develop ground motion prediction equations for Arias Intensity (Ia) and 5-95% Significant Duration (Ds5-95). Relationships are developed both for shallow crustal earthquakes and subduction zone earthquakes. The models developed consider site amplification using a simple VS30-based parameterization. For Ds5-95, we also observe strong magnitude dependency in path duration. The results of this study also allow a comparison between earthquakes in shallow-crustal and subduction regimes. This comparison shows that Arias Intensity of shallow crustal earthquakes increases more rapidly with magnitude and Arias Intensity of subduction earthquakes attenuate more with distance. On the other hand, the ground motion prediction equation for duration is different for both types of earthquakes. In general, durations for subduction earthquakes are longer for similar magnitude earthquakes. We observe partial saturation for the duration of subduction earthquakes after 200 km and partial saturation for shallow crustal earthquakes after 50 km. We also investigate the relationship between Arias Intensity and duration residuals. Arias Intensity and duration residuals are negatively correlated which means, on average, when Arias Intensity is over predicted duration is underpredicted.
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