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The Kushiro-Oki earthquake occurred off Kushiro, Hokkaido, Japan, on January 15, 1993. The epicentral coordinates given by the Japan Meteorological Agency (JMA) are 42°51'N and 144°23'E. The focal depth is 107 km and the JMA magnitude is 7.8. According to Kasahara (1993), this earthquake took place in the Pacific plate descending beneath Hokkaido. The double-planed deep seismic zone appears in this region and the present earthquake is located on the lower seismic plane. A cluster of aftershocks was observed in an area of about 40 •~ 40 km2 and the epicenter of the main shock is located near the southeast corner of the aftershock area. Kasahara (1993) named this the Kushiro-Oki cluster. Another cluster of aftershocks was observed in a small area which is located at about 50 km east of the epicenter of the main shock. This one is called the Akkeshi-Oki cluster by Kasahara (1993) and the activity is not so energetic as that of the Kushiro-Oki cluster. There is a seismic gap in space between the two clusters. The hypocenters of the Kushiro-Oki cluster formed an almost horizontal plane at a depth of about 100 km and the hypocenter of the main shock is also located on it. The main shock is composed of the main event and the pre-event that occurred 6 s before the main event. A focal mechanism solution has been obtained for the pre-event

Fault Length and Direction of Rupture Propagation for the 1993 Kushiro-Oki Earthquake as Derived from Strong Motion Duration.