甚低频/低频人工源电波信号地震应用研究进展

张学民

张学民. 2021. 甚低频/低频人工源电波信号地震应用研究进展. 地震学报,43(5):1−18 doi: 10.11939/jass.20210143
引用本文: 张学民. 2021. 甚低频/低频人工源电波信号地震应用研究进展. 地震学报,43(5):1−18 doi: 10.11939/jass.20210143
Zhang X M. 2021. The development in seismic application research for VLF/LF radio waves. Acta Seismologica Sinica,43(5):1−18 doi: 10.11939/jass.20210143
Citation: Zhang X M. 2021. The development in seismic application research for VLF/LF radio waves. Acta Seismologica Sinica43(5):1−18 doi: 10.11939/jass.20210143

甚低频/低频人工源电波信号地震应用研究进展

doi: 10.11939/jass.20210143
基金项目: 国家重点研发计划课题(2018YFC1503506)和国家自然科学基金(41674156)联合资助
详细信息
    通讯作者:

    张学民,e-mail:zhangxm96@126.com

  • 中图分类号: P315.72+2

The development in seismic application research for VLF/LF radio waves

  • 摘要: 甚低频/低频人工源电波作为一种主动源发射的通讯导航信号,因其长距离波导传播的特性在地-电离层观测及应用中表现出较大的优势。本文总结了二十世纪末以来基于甚低频/低频(VLF/LF)电波的观测技术及其数据分析方法、典型震例及统计研究成果、圈层耦合机理等方面的研究进展。通过探讨其应用成果的快速积累及前兆扰动起源的研究难点等问题,探讨了未来在我国多种地基和卫星电磁配合下的综合立体体系建设以及该技术可能发挥的最大贡献。

     

  • 图  1  1995年1月17日日本神户MS7.2地震前后TTs异常(Molchanov et al,1998a

    横轴为当地时间0—24时,tm为早晨日出时间,te为黄昏日落时间,图中阴影区为异常

    Figure  1.  The TTs anomalies around Kobe Ms7.2 earthquake on 17 January 1995 (Molchanov et al,1998a

    x-axis indicates the local time of 0−24,tm is the morning time,te is the evening time, the shadow areas are the anomalies

    图  2  2011年3月11日东日本大地震前后VLF信号夜侧平均强度(Trend)及离差(Dispersion)的直方图和M-t地震序列(Hayakawa et al,2018

    Figure  2.  The histogram of nighttime average amplitude (Trend) and deviation (Dispersion) of VLF signals around Tohoku Earthquake in Japan on 11 March 2011 and the M-t series of this earthquake (Hayakawa et al,2018

    图  3  2005年6—9月VLF 观测链路上三个物理参量(从上至下分别为NF,Trend,AGWM)归一化标准差直方图及其与邻近地震(顶部红色垂线)(Muto et al,2009

    Figure  3.  The normalized standard deviation histogram of three parameters (from top to the bottom is NF,Trend,and AGWM respectively) along the VLF observing link of JJY-KCK and the neighboring earthquakes (the red vertical line at the top of each panel) during June to September in 2005

    图  4  2008年5月12日汶川MS8.0地震前后LF人工源信号SNR时空演化图(1—5月,每半月一张图;Zhang et al,2019

    Figure  4.  The temporal and spatial variations of SNR from LF transmitter signals around Wenchuan MS8.0 earthquake on 12 May 2008 (during January to May with half month for each panel,from Zhang et al,2019

    图  5  岩石层- 大气层- 电离层圈层耦合机理及耦合通道(引自Hayakawa,2004

    Figure  5.  Lithosphere-atmosphere-ionosphere coupling mechanism and channels (from Hayakawa,2004

    表  1  中国无线电频率划分表

    带号频 带 名 称频 率 范 围波 段 名 称波 长 范 围
    −1至低频(TLF)0.03—0.3 Hz至长波或千兆米波10 000—1 000 Mm
    0至低频(TLF)0.3—3 Hz至长波或百兆米波1000—100 Mm
    1极低频(ELF)3—30 Hz极长波100—10 Mm
    2超低频(SLF)30—300 Hz超长波10—1 Mm
    3特低频(ULF)300—3 000 Hz特长波1000—100 km
    4甚低频(VLF)3—30 kHz甚长波100—10 km
    5低频(LF)30—300 kHz长波10—1 km
    6中频(MF)300—3 000 kHz中波1000—100 m
    7高频(HF)3—30 MHz短波100—10 m
    8甚高频(VHF)30—300 MHz米波10—1 m
    9特高频(UHF)300—3000 MHz分米波10—1 dm
    10超高频(SHF)3—30 GHz厘米波10—1 cm
    11极高频(EHF)30—300 GHz毫米波10—1 mm
    12至高频(THF)300—3 000 GHz丝米波或亚毫米波10—1 dmm
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出版历程
  • 收稿日期:  2021-08-30
  • 修回日期:  2021-09-12
  • 网络出版日期:  2021-11-11

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