Forecast of the Dayao,Yunnan,M6.2 Earthquake in 2003 and Its Scientific Evidences

Through the study on some anomalies before the Dayao M6.2 earthquake on July 21 of 2003, such as the 613 days of quiescence without M≥5.0 shocks from October of 2001 to June of 2003, significant energy prerelease process in February-June of 2003, depth distribution anomaly of M≥4.0 earthquakes from September of 2002 to June of 2003, group anomaly of mercury in water in May-June of 2003 and the forming of the seismogenic area of strong earthquake from February of 2002 to June of 2003, the dynamic evaluation processes on time, location and magnitude of the earthquake have been revealed. Meanwhile, the concrete technique and actual forecast process of the three elements of the Dayao M6.2 earthquake is presented. Exploring the understanding process before the strong earthquake has reference to the future earthquake forecast.