| 中国大陆西部强震前超低频磁场时空变化特征 |
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| 引用本文： | 冯丽丽,冯志生,樊文杰,管贻亮,贺曼秋,李霞,何畅,廖晓峰,艾萨?伊斯马伊力,袁文秀,李莎.中国大陆西部强震前超低频磁场时空变化特征[J].地震学报,2021,43(3):359-375. |
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| 作者姓名： | 冯丽丽 冯志生 樊文杰 管贻亮 贺曼秋 李霞 何畅 廖晓峰 艾萨?伊斯马伊力 袁文秀 李莎 |
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| 作者单位： | 中国西宁 810001 中国地震局青海格尔木青藏高原内部地球动力学野外科学观测研究站;中国西宁 810001 青海省地震局;中国南京 400071 江苏省地震局;中国昆明 650224 云南省地震局;中国济南 250014 山东省地震局;中国重庆 401147 重庆市地震局;中国成都 610041 四川省地震局;中国乌鲁木齐 830001 新疆维吾尔自治区地震局;中国杭州 310013 浙江省地震局;中国南宁 530001 广西壮族自治区地震局 |
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| 基金项目： | 地震科技星火计划（XH20062）、中国地震局青海格尔木青藏高原内部地球动力学野外科学观测研究站专项课题“青藏高原岩石圈磁场特征分析”和中国地震局监测预报司震情跟踪定向工作任务（2020020401）联合资助 |
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| 摘 要： | 对2015年至2019年期间中国大陆西部的磁通门磁力仪秒采样观测资料开展了5—100 s频段的地磁垂直强度极化分析，并运用一些数学方法对分析结果进行了处理。结果显示，极化高值在经向和纬向均无明显的形态和幅值变化，且极化高值与地磁外源场扰动无关。在此基础上筛选出18次极化高值异常事件，利用插值方法得到了极化高值异常的空间分布图，并分析了18次高值异常与中国大陆西部及周边15次强震的时空关系。分析结果表明:地磁场出现多台同步极化高值现象后的半年内，高值区可能发生M6.0以上强震；高值现象出现后，多个高值区均有可能发生强震；后续强震的震级与高值区面积呈正相关。
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| 关 键 词： | 地磁场 极化 强震 中国大陆西部 |
| 收稿时间： | 2020-06-05 |
Spatio-temporal variation characteristic of the ultra-low frequency magnetic field prior to strong earthquakes of western Chinese mainland |
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| Feng Lili,Feng Zhisheng,Fan Wenjie,Guan Yiliang,He Manqiu,Li Xia,He Chang,Liao Xiaofeng,Aisa Yisimayili,Yuan Wenxiu,Li Sha.Spatio-temporal variation characteristic of the ultra-low frequency magnetic field prior to strong earthquakes of western Chinese mainland[J].Acta Seismologica Sinica,2021,43(3):359-375. |
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| Authors: | Feng Lili Feng Zhisheng Fan Wenjie Guan Yiliang He Manqiu Li Xia He Chang Liao Xiaofeng Aisa Yisimayili Yuan Wenxiu Li Sha |
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| Abstract: | Based on the one second sampling data from fluxgate magnetometers in western Chinese mainland from 2015 to 2019, this paper carried out the vertical component polarization analysis of the frequency band between 5 s to 100 s, and then processed the analysis results by some mathematical methods. The results show that the high polarization value has no obvious shape and amplitude change in both meridional and zonal directions, and the high polarization value has nothing to do with geomagnetic field disturbance. On this basis, 18 high-value anomalies were screened out, and their spatial distribution map was obtained by interpolation method. The results show that within half a year after the synchronous appearance of multiple high-value anomalies of the vertical component polarization of geomagnetic field, the high-value region may have a strong earthquake with magnitude over M6.0. After the appearance of high value phenomenon, several high value regions are likely to have strong earthquakes; furthermore the magnitude of subsequent strong earthquake seems to be positively correlated with the area of the high-value zone. |
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