关键词: 前兆异常涨落, 强震短期预测, 中国大陆西部

Abstract: The relationship between fluctuation of anomalies in the western China and short-term prediction of strong earthquakes was studied on the basis of statistical result of monthly anomaly frequency in Yunnan, Sichuan, Qinghai, Gansu, Ningxia, and Xinjiang regions. The result shows that the number of the anomalies increases obviously and turns down before most of the strong earthquakes. The beginning time of the increase process is generally about three to eight months before the strong earthquake occurrence, sometimes fourteen to eighteen months. The peak of the increase process is about one to ten months before the strong earthquakes. The study shows that when the monthly frequency of anomalies reaches the peak value, the seismogenic process of strong earthquakes enters the medium-to short-term stage. The result also shows that the anomalies increase not only in Qinghai and Gansu regions but also in Yunnan and Sichuan regions before the West Kunlunshankou M8.1 earthquake, which might indicate that the seismogenic process of this giant earthquake has affected far away to Sichuan and Yunnan regions

Key words: Fluctuation of precursory anomalies, Short term prediction of strong earthquake, Western part of China's continent