| 汶川地震(MS8.0)前的地磁低频峰值变化 |
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| 引用本文： | 李秋红,李英,陈双贵.汶川地震(MS8.0)前的地磁低频峰值变化[J].西北地震学报,2016,38(4):606-608. |
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| 作者姓名： | 李秋红 李英 陈双贵 |
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| 作者单位： | 甘肃省地震局, 甘肃 兰州 730000,甘肃省地震局, 甘肃 兰州 730000,兰州观象台, 甘肃 兰州 730046 |
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| 基金项目： | 地震行业科研专项（201208009）；地震行业科研专项（201308011）；甘肃省地震局科技发展基金（2012y02） |
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| 摘 要： | 以2008年5月12日发生的汶川地震(M_S8.0)为研究对象,选取震前2007年7月—2008年6月成都地磁台的观测数据每月计算一个低频段功率谱峰值,并对2011年7月—2012年6月和2012年7月—2013年6月两个时间段的资料作同样的数据处理。结果表明,成都台2007年7月—2008年6月的低频段功率谱峰值震前出现一些幅度较大的变化,而另外两个时段则显示较为平稳的低频段功率谱峰值。作为对照,对西昌台同时段资料也作相同的处理,其结果显示震前未出现和成都台类似的异常结果。结合其他研究结果,初步认为这种现象可能与汶川地震(M_S8.0)有关联,且这种现象的出现可能与震中距有关,但其发生机理尚需进一步研究。这一结果对于震磁关系的研究具有参考意义。
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| 关 键 词： | 汶川地震 地磁Z分量 功率谱密度 成都台 西昌台 |
| 收稿时间： | 2015/9/8 0:00:00 |
Peak Value Change of Power Spectrum at Low Frequency Before Wenchuan MS8.0 Earthquake |
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| LI Qiu-hong,LI Ying and CHEN Shuang-gui.Peak Value Change of Power Spectrum at Low Frequency Before Wenchuan MS8.0 Earthquake[J].Northwestern Seismological Journal,2016,38(4):606-608. |
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| Authors: | LI Qiu-hong LI Ying and CHEN Shuang-gui |
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| Institution: | Earthquake Administration of Gansu Province, Lanzhou 730000, Gansu, China,Earthquake Administration of Gansu Province, Lanzhou 730000, Gansu, China and Lanzhou geomagnetic station, Earthquake Administration of Gansu Province, Lanzhou 730046, Gansu, China |
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| Abstract: | The geomagnetic field is one of the basic geophysical fields,and the seismomagnetic relationship has been laboratory tested.Many studies in China and abroad have reported abnormal geomagnetic variations prior to the occurrence of earthquakes.In this study,with the Wenchuan earthquake as our research object,we selected observation data from the Chengdu geomagnetic station for three periods (July 2007-June 2008 prior to the occurrence of the earthquake,July 2011-June 2012,and July 2012-June 2013 following the occurrence the earthquake).Using the same data processing method for each,we calculated the peak values of their power spectra in the low-frequency band.The results show some abnormal changes in the peak value of the power spectrum at low frequency from July 2007 to June 2008 at the Chengdu station,but no similar changes occurred during the other two periods (July 2011-June 2012 and July 2012-June 2013).To further examine the data,we used the same data processing method for the same periods with data from the Xichang geomagnetic station and observed no abnormal changes.Combined with our other research results,we found the abnormal change to be related to the Wenchuan earthquake,based on its regional characteristics,which was likely related to the epicenter distance.However,determining the generation mechanism of this phenomenon will require more data and further research.These results represent a significant contribution to the study of the seismo-magnetic relationship. |
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| Keywords: | Wenchuan earthquake geomagnetic Z-compent power spectrum density Chengdu station Xichang station |
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