【摘要】 应用检测地震活动水平相对变化的区域—时间—长度算法(RTL算法),分析研究了云南地区有较完备小震资料的13次6级以上震例。结果表明,该区6级以上地震发生前在源区或近源区大约100 km半径的空间尺度内,VRTL值能检测到明显的1年以内时间尺度的中短期地震活动异常,它主要是以表征地震活动增强的“上升型”异常为主,占77%。更多还原

【Abstract】 Region-time-length Algorithm（shorted as RTL Algorithm） can be used to estimate the relative changes of the level of seismicity.We apply it to the Yunnan area and analyze 13 M_S≥6.0 earthquakes with relatively complete data of small shocks.The results indicate that V_RTL values show obvious intermediate-,short-term anomalies in the source zones or nearby about 100-km-radius range in one year before the events,and mainly the seismic activity strengthening anomalies,up to 77 %.更多还原