地震活动因子A值在丽江7.0、宁蒗6.2、永胜6.0级三次地震前异常变化特征
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摘要
引用地震活动因子A值作为基本参量,对1996年丽江7 0、1998年宁蒗6 2、2001年永胜6 0级地震前一年间的M≥3 0级地震资料进行空间扫描,并采用动态跟踪方法,结果发现,三次地震前一年左右,震中周围A值均出现高值异常,并且震前1~2月异常区域面积都明显扩展,因此根据异常面积明显扩展可对M≥6 0级地震进行短临预测。此外,当有多个强震孕育时,常常会有多个异常区出现,因此,当出现多个异常区时,要警惕其后强震的连发。
As an index, the seismicity factor A-value were used to scan the whole year within the magnitude equal to or greater than M3.0 class before Lijiang 7.0, Ninglan 6.2 and Yongshen 6.0 earthquakes respectively occurred in 1996, 1998 and 2001. Our scanning result shows that about a year before these three earthquakes, there is a hign value abnormal area around the epicenter region. And 1-2 months before earthquakes, the area of the abnormal A-value gets bigger and so based on the abnormal area with A-value abnormal factor, an M6.0 earthquake may happen. Addition to these indexes, several abnormal areas may suggest several of middle and strong earthquakes around.
引文
[1] 王炜,刘峥,等 地震活动性的定量化及其在地震短期预报中的应用[J] 地震学刊,1998,(4)
     ①西南地区短期综合预报方法研究,付虹、杜方等.

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