“…For the purpose of the precursor application and earthquake source study, in the past two decades, foreshock characteristics have been studied in the different places such as California (Jones, 1984), the western United States (Abercrombie and Mori, 1996), Japan (Shibazaki and Matsu'ura, 1995;Ogata et al, 1996;Maeda, 1996), Italy (Console and Murru, 1996) and Greece (Bernard et al, 1997). Although there are still some debates about application of foreshocks as an earthquake precursor (Geller, 1997;Felzer et al, 2004), some of felt foreshocks really provided some valuable information for immediate warning and significantly reduced the casualties, such as the 1975 Haicheng (China) earthquake (Raleigh, 1977) and the 1995 Lozani-Grevena (Greece) earthquake (Hatzfeld et al, 1995;Bernard et al, 1997). Unfortunately, most of deadly earthquakes so far took place without any foreshock.…”