1998年11月19日云南宁蒗6.2级地震前地震活动性特征
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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．
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.
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.
引文
1王炜,等地震空间集中度C值及其在地震预报中的应用见:地震预报方法实用化研究文集,国家地震局科技监测司编.学术书刊出版社,1989:127～141
2刘蒲雄.等大地震前地震活动图像演变及中期向短期过渡的地震活动性标志地震,1997.17(2):113～115
3王炜,等地震时间间隔的统计分布及其地震危险度 D值在华北大震前的异常变化地震学报, 1987. 9(2)
2刘蒲雄.等大地震前地震活动图像演变及中期向短期过渡的地震活动性标志地震,1997.17(2):113～115
3王炜,等地震时间间隔的统计分布及其地震危险度 D值在华北大震前的异常变化地震学报, 1987. 9(2)
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