This paper summarizes the layout of the Yunnan seismic ELF electromagnetic observation network,site selection,ELF electromagnetic instrument system,data processing and other construction. The principle and method of u...This paper summarizes the layout of the Yunnan seismic ELF electromagnetic observation network,site selection,ELF electromagnetic instrument system,data processing and other construction. The principle and method of using the ELF electromagnetic wave technique to monitor and predict earthquakes are expounded. The long term monitoring of ELF electromagnetic fields is carried out in the Yunnan earthquake prone area,and at the same time,the changes in electrical parameters and spatial electromagnetic fields of the regional crustal medium structure are monitored. The functions such as automatic,quasi real time, remote monitoring, network monitoring, data processing specialization, data service,data sharing and industrialization of the ELF electromagnetic observation data have been realized. In order to capture the deep electromagnetic precursory information of the earthquakes,service for earthquake prediction research,which has broad application prospects and development potential. Through the research of the seismicity of Yunnan in the trial run period of the project,the preliminary results of the extreme low frequency electromagnetic observation of the Yunnan earthquake in recent years are given. The electromagnetic precursors and the electromagnetic effects of the Yangbi earthquake are recorded. In the 3-month period before the earthquake,the power spectrum of the electric and magnetic fields,the apparent resistivity and the impedance phase in the observed signals are all abnormal,and gradually increased with time. The maximum value is reached 20 days before the earthquake,and an earthquake occurs when the change is restored to normal.展开更多
1研究背景地震的孕育和发生通常伴随着应力场变化、地下流体迁移、地壳浅层破坏等事件的发生,从而导致地下介质物理性质(如波速)的变化。由于背景噪声监测方法的独特优势,背景噪声互相关函数在监测地震孕育过程中展现了巨大潜力(Brengui...1研究背景地震的孕育和发生通常伴随着应力场变化、地下流体迁移、地壳浅层破坏等事件的发生,从而导致地下介质物理性质(如波速)的变化。由于背景噪声监测方法的独特优势,背景噪声互相关函数在监测地震孕育过程中展现了巨大潜力(Brenguier et al,2008),也为地震预测预报工作提供了有用的参考信息。然而,噪声源季节性变化,对以背景噪声互相关方法测量的地震波速度的精度存在影响。因此,利用背景噪声监测地震波速度变化,必须对噪声源机制有清晰认识。展开更多
基金supported by the National Development and Reform Commission,PRCthe elventh “Five-year Plan” National Major Scientific and Technological Infrastructure Construction Projects
文摘This paper summarizes the layout of the Yunnan seismic ELF electromagnetic observation network,site selection,ELF electromagnetic instrument system,data processing and other construction. The principle and method of using the ELF electromagnetic wave technique to monitor and predict earthquakes are expounded. The long term monitoring of ELF electromagnetic fields is carried out in the Yunnan earthquake prone area,and at the same time,the changes in electrical parameters and spatial electromagnetic fields of the regional crustal medium structure are monitored. The functions such as automatic,quasi real time, remote monitoring, network monitoring, data processing specialization, data service,data sharing and industrialization of the ELF electromagnetic observation data have been realized. In order to capture the deep electromagnetic precursory information of the earthquakes,service for earthquake prediction research,which has broad application prospects and development potential. Through the research of the seismicity of Yunnan in the trial run period of the project,the preliminary results of the extreme low frequency electromagnetic observation of the Yunnan earthquake in recent years are given. The electromagnetic precursors and the electromagnetic effects of the Yangbi earthquake are recorded. In the 3-month period before the earthquake,the power spectrum of the electric and magnetic fields,the apparent resistivity and the impedance phase in the observed signals are all abnormal,and gradually increased with time. The maximum value is reached 20 days before the earthquake,and an earthquake occurs when the change is restored to normal.
文摘1研究背景地震的孕育和发生通常伴随着应力场变化、地下流体迁移、地壳浅层破坏等事件的发生,从而导致地下介质物理性质(如波速)的变化。由于背景噪声监测方法的独特优势,背景噪声互相关函数在监测地震孕育过程中展现了巨大潜力(Brenguier et al,2008),也为地震预测预报工作提供了有用的参考信息。然而,噪声源季节性变化,对以背景噪声互相关方法测量的地震波速度的精度存在影响。因此,利用背景噪声监测地震波速度变化,必须对噪声源机制有清晰认识。
