Source characteristics of shallow intraslab earthquakes derived from strong-motion simulations

Source modeling of recent shallow intraslab earthquakes is studied using strong-motion data. The total area of strong-motion generation areas obtained is smaller than the prediction from the empirical relationship for inland crustal earthquakes by Somerville and co-workers. Moreover, the ratio between the combined area of strong-motion generation areas obtained in this study and the area predicted by the empirical relationship, tends to decrease with focal depth. The stress drops on strong motion generation areas (or asperities) of shallow intraslab earthquakes increase with focal depth.