• 责任者：Qian Xiaodong (Earthquake Administration of Yunnan Province ; Kunming 650224 ; China) ; Su Youjin
• 刊名：Journal of Seismological Research
• 出版年：2013
• 卷期：36(1)
• 关键词：强震 ; strong earthquakes ; 四川 ; Sichuan Province
• 页码：p.15-23
• 图表：illus., 17 refs.
• 分类号：0500
• issnNo：ISSN1000-0666
• isbnNo：CN53-1062/P

Basing on waveform data in Yunnan Regional Digital Network, we calculated the variation of wave velocity ratio before and after the Panzhihua Ms6. 1 earthquake which occurred on Aug. 30, 2008 in the boundary be- tween Sichuan and Yunnan by multi-station method. The results showed that the wave velocity ratio decreased for a relatively long duration in study area in three years before the earthquake, and it decreased sharply for rela- tively short duration, accompanied by a number of low abnormal in half a year before the earthquake. From more than two months before the earthquake to earthquake occurrence, wave velocity ratio gone up again from the low value to the mean value, after the earthquake, high value. Wave velocity ratio anomalies were obvious and northeast of earthquake zone. it maintained around the mean value accompanied by the near Yuanmou and Qiaojia-Puge respectively in southern