1. U. S. Geological Survey at University of Washington, Seattle, Washington 98195-1310, USA
2. Institute of Geoscience, GSJ-AIST, Tsukuba 305-8567, Japan
3. Department of Geology, Humboldt State University, Arcata, California 95521, USA
4. Department of Geography, University of Tokyo, Faculty of Science Building #5, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
5. Department of Earth and Planetary Sciences, Kyushu University, Fukuoka 812-8581, Japan
6. Faculty of Education, Ehime University, Matsuyama 790-8577, Japan
7. Department of Geology, Kent State University, Kent, Ohio 44242, USA
8. Geological Survey of Japan, AIST, Tsukuba 305-8567, Japan
9. 1nstitute of Seismology and Volcanology, Hokkaido University, Sapporo 060-0810, Japan
10. Geographical Survey Institute, Tsukuba, Ibaraki 305-0811, Japan
11. 2-11-13-201, Minami-Senzoku, Ota-ku, Tokyo 145-0063, Japan
12. Research Center for Earthquake Prediction, Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan