地磁“低点位移”现象与强震预测研究
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摘要
利用中国地磁台网40年观测资料,研究了2008年3月21日新疆于田7.3级地震,2001年11月14日昆仑山口西8.1级地震等108次强震前,地磁垂直分量日变极小值出现的时间在空间分布上的异常特征即"低点位移"现象。这种少见的异常现象与强震发生有较好的相关性,发震日期为异常日后的第27天或41天前后4天,强震发生地区在低点位移突变分界线附近。此外,还研究了于田7.3级、昆仑山口西8.1级临震前震中周围出现的地磁日变幅异常现象。地磁低点位移是复杂的地球物理现象,受多种因素影响,其"探测-感应-触发"机理仍处在探索之中。
On the basis of data recorded for 40 years by the network of geomagnetic observatories in China,the anomalous features of appearance time of the minima of diurnal variations of the geomagnetic vertical component and the variation of their spatial distribution(i.e,phenomena of low-point displacement)have been studied,before XinjiangYutian Ms7.3 on March.21,2008,Kunlunshan Ms8.1 on Nov.14,2001 and more than 108 strong Earthquakes.Such rare phenomena of geomagnetic anomalies are an objective reality,being well-correlated with the occurrence of earthquakes.It has been found that most earthquakes occur in the vicinity of the boundary line of sudden change of the low-point displacement and generally within four days before and after the 27th or 41st day counting from the day of appearance of the anomaly.The anomalies of diurnal-variation amplitude near the epicentral area have been also studied before Yutian Ms7.3 and Kunlunshan Ms8.1 earthquakes.The low-point displacement is one of complicated geophysical phenomena influenced by many factors and its mechanism of "exploring-inducing-triggering" is still understudy.
On the basis of data recorded for 40 years by the network of geomagnetic observatories in China,the anomalous features of appearance time of the minima of diurnal variations of the geomagnetic vertical component and the variation of their spatial distribution(i.e,phenomena of low-point displacement)have been studied,before XinjiangYutian Ms7.3 on March.21,2008,Kunlunshan Ms8.1 on Nov.14,2001 and more than 108 strong Earthquakes.Such rare phenomena of geomagnetic anomalies are an objective reality,being well-correlated with the occurrence of earthquakes.It has been found that most earthquakes occur in the vicinity of the boundary line of sudden change of the low-point displacement and generally within four days before and after the 27th or 41st day counting from the day of appearance of the anomaly.The anomalies of diurnal-variation amplitude near the epicentral area have been also studied before Yutian Ms7.3 and Kunlunshan Ms8.1 earthquakes.The low-point displacement is one of complicated geophysical phenomena influenced by many factors and its mechanism of "exploring-inducing-triggering" is still understudy.
引文
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[2]G Duma ond Y Ruzhin.Diurnal changes of earthquakeactivity and geomagnetic Sq-variations[C].NaturalHazards and Earth System Sciences,2003,3:171-177.
[3]丁鉴海,刘杰,余素荣等.地磁日变化异常与强震的关系[J].地震学报,2004,26(增刊):79-87.
[4]丁鉴海,卢振业,黄雪香.地震地磁学[M].北京:地震出版社,1994,253-267.
[5]丁鉴海,黄雪香,邢如英等.地磁“低点位移”现象及其与地震的关系[J].地震学报,1988,10(4):406-414.
[6]中国地震局监测预报司.GPS、卫星遥感及地球变化磁场地震短期预测方法研究[M].北京:地震出版社,2006,107-143.
[7]国家地震局科技监测司.地震预报方法实用化研究论文集[C].北京:学术期刊出版社。1989,586-590.
[8]徐文耀.磁层电场引起的Sq“低点位移”[J].地震地磁观测与研究,1985,6(1):8-12.
[9]丁鉴海,索玉成,余素荣.地磁场与电离层异常现象及其与地震的关系[J].空间科学学报,2005,25(6):536-542.
[10]Markus B.ath.Spectral analysis in geophysics[M].New York Elsevier scientific publishing company,1974,285-287.
[11]熊皓.无线电波传播[M].北京:电子工业出版社,2000,27-35.
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