| 中强震前地磁谐波振幅比的趋势性变化特征初步研究 |
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| 引用本文： | 冯志生,梅卫萍,张秀霞,庄明龙,张晓勇.中强震前地磁谐波振幅比的趋势性变化特征初步研究[J].西北地震学报,2004,26(1):50-56. |
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| 作者姓名： | 冯志生 梅卫萍 张秀霞 庄明龙 张晓勇 |
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| 作者单位： | 江苏省地震局,江苏,南京,210014 |
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| 基金项目： | 地震科学联合基金项目(101008) |
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| 摘 要： | 应用最大似然谱分析技术，获得了上海余山台和崇明台1982年至1999年的地磁三分量之间的短周期谐波振幅比。经初步分析发现，在中强地震前后谐波振幅比的趋势性异常表现为下降—转折—恢复的过程，持续时间为1～3年。同时变化还具有由长周期(深部)向短周期(浅部)迁移的特征。
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| 关 键 词： | 地磁异常 谐波 振幅比 |
| 文章编号： | 1000-0844(2004)01-0050-07 |
| 收稿时间： | 2003/5/12 0:00:00 |
| 修稿时间： | 2003年5月12日 |
PRELIMINARY STUDY ON THE CHARACTERISTICS OF LONG AND MEDIUM TERM VARIATION FOR THE AMPLITUDE RATIO OFGEOMAGNETIC HUMOROUS WAVE BEFORE MODERATE-STRONG EARTHQUAKES |
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| FENG Zhi-sheng,MEI Wei-ping,ZHANG Xiu-xi,ZHUANG Ming-long and ZHANG Xiao-yong.PRELIMINARY STUDY ON THE CHARACTERISTICS OF LONG AND MEDIUM TERM VARIATION FOR THE AMPLITUDE RATIO OFGEOMAGNETIC HUMOROUS WAVE BEFORE MODERATE-STRONG EARTHQUAKES[J].Northwestern Seismological Journal,2004,26(1):50-56. |
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| Authors: | FENG Zhi-sheng MEI Wei-ping ZHANG Xiu-xi ZHUANG Ming-long and ZHANG Xiao-yong |
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| Institution: | Seismological Bureau of Jiangsu Province, Nanjing 210014, China,Seismological Bureau of Jiangsu Province, Nanjing 210014, China,Seismological Bureau of Jiangsu Province, Nanjing 210014, China,Seismological Bureau of Jiangsu Province, Nanjing 210014, China and Seismological Bureau of Jiangsu Province, Nanjing 210014, China |
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| Abstract: | The amplitude ratios of short-period geomagnetic humorous wave among the three compnents from Sheshan and Chongming geomagnetic stations, Shanghai city, from 1982 to 1999 are obtained, with the technology of maximum-likelihood method (MLM).By preliminary analysis, the characteristics of long and medium term anomalous variation of the ratio in seismogenic process of moderate-strong earthquakes are declining,turning,then resuming,and the duration is about 1~3 years.Meanwhile the migration characteristics of the anomalous variation from long-period to short-period are found. |
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| Keywords: | Geomagnetic anomaly Humorous wave Amplitude ratio |
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