1. Habermann, R. E., Man-made changes of seismicity rates, Bull. Seismol. Soc. Am., 77, 141–159, 1987.
2. Kanamori, H., The nature of seismicity patterns before large earthquakes, in Earthquake Prediction, Maurice Ewing Series, IV, 1–19, AGU, Washington D.C., 1981.
3. Katsumata, K. and M. Kasahara, Precursory seismic quiescence before the 1994 Kurile earthquake (Mw=8.3) revealed by three independent seismic catalogs, Pure Appl. Geophys., 155, 443–470, 1999.
4. Kelleher, J. and J. Savino, Distribution of seismicity before large strike slip and thrust-type earthquakes, J. Geophys. Res., 80, 260–271, 1975.
5. Mogi, K., Some feature of recent seismic activity in and near Japan (2), Activity before and after great earthquakes, Bull. Earthq. Res. Inst., Tokyo Univ., 47, 395–417, 1969.