Fig. 4

Map view and vertical cross-section of P-axis distribution along the main shock fault. P-axes of the events located in the dashed rectangle on the map are plotted on the cross-section; left and right figures show data immediately after and 18 years. after the main shock, respectively. The star indicates the hypocenter of the main shock. The area where co-seismic slip is larger than 2.5 m (Iwata et al. 2002) is indicated by a pink dashed line