格尔木地磁Z分量静日变化特征与前兆异常分析
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摘要
研究了格尔木地震台1996—2006年地磁模拟资料和2008—2011年的数字化资料,通过对台站磁静日低点时间、日变幅度、日变形态的分析,确认地磁Z分量磁静日低点时间在地方时12时左右;日变幅月均值呈现明显的波浪式起伏变化,其年均值与太阳黑子数保持一致;地磁日变形态较为规则,有1个低点和2个高点;在前兆异常分析中,认为低点时间异常和日变形态双低点异常与周边强震具有一定的对应关系。
The data of geomagnetic field simulation data and digital data from 1996 to 2006,2008 ~ 2011 are studied in Golmud seismic station,and the low magnetic quiet day variation amplitude,daily variation of geomagnetic Z component are analyzed,the magnetic quiet day low time is at about 12 o' clock,diurnal variation of monthly mean undulates,the annual mean and sunspot number is consistent;geomagnetic diurnal variation patterns are relatively regular,there is a low and 2 high points in the precursory anomalies.The low time anomalies and daily variation of double low anomalies and earthquakes in neighboring areas have a certain relationship.
The data of geomagnetic field simulation data and digital data from 1996 to 2006,2008 ~ 2011 are studied in Golmud seismic station,and the low magnetic quiet day variation amplitude,daily variation of geomagnetic Z component are analyzed,the magnetic quiet day low time is at about 12 o' clock,diurnal variation of monthly mean undulates,the annual mean and sunspot number is consistent;geomagnetic diurnal variation patterns are relatively regular,there is a low and 2 high points in the precursory anomalies.The low time anomalies and daily variation of double low anomalies and earthquakes in neighboring areas have a certain relationship.
引文
[1]北京大学,中国科学技术大学.地磁学教程[M].北京:地震出版社,1986:1-3.
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[5]胡久常,刘伟,郭敏瑞,等.汶川8.0级特大地震前的地磁垂直分量日变双低点异常[J].地震学报,2009,31(5):589-593.
[2]倪永生.地磁学简明教程[M].北京:地震出版社,1990:89-95.
[3]青海省地震局.青海省地震监测志[M].北京:地震出版社,2005:23-25.
[4]格尔木地磁台.地磁观测报告[M].北京:地震出版社,1994:1-2.
[5]胡久常,刘伟,郭敏瑞,等.汶川8.0级特大地震前的地磁垂直分量日变双低点异常[J].地震学报,2009,31(5):589-593.
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