【摘要】 １９９８年１１月１９日在云南省宁■发生了一次Ｍｓ６．２强烈地震．该次地震前震中及邻区地震活动明显增强．累计频度和应变释放随时间从线性缓慢增长变为非线性快速增加，出现孕震空区，多项地震活动性参数出现异常．此外，地震活动性诸多参数在地活动处于线性缓慢变化的时间段内，在空间分布上表现为随机、零星的现象；在地活动处于非线性快速变化的时间段内，这些参数的空间分布表现出向未来震中收缩、集中的明显特征．更多还原

【Abstract】 On Nov. 19, 1998, a strong earthquake with magnitude 6.2 occurred in Ninlang, Yunnan province.Before this earthquake, the seismic activity of the epicenter zone and itS neighborhood intensified obviously. Thecumulative frequency and strain release change with time, from slow linear increment to quick nonlinear increment.A seismogenic gap and seismic activity index anomalies appeared. Moreover, in the period of slow linearvariety, seismicity parameters show a spatial distribution featUre with random and sporadic events, and duringquick nonlinear variety they show a significant feature of converging toward the epicenter.更多还原