2008年汶川MS8.0与2010年玉树 MS7.1地震前电磁现象研究

范莹莹; 解滔; 安张辉; 杜学彬; 谭大诚; 刘君; 陈军营

doi:10.3969/j.issn.0253-3782.2014.02.012

2008年汶川M_S8.0与2010年玉树 M_S7.1地震前电磁现象研究

范莹莹^1,2, ,,
解滔³,
安张辉^1,2,
杜学彬^1,2,
谭大诚^1,2,
刘君^1,2,
陈军营^1,2

1.
中国兰州 730000 中国地震局地震预测研究所兰州科技创新基地
2.
中国兰州 730000 中国地震局兰州地震研究所
3.
中国北京 100045 中国地震台网中心

基金项目: 中国地震局地震预测研究所基本科研业务费专项(2012IESLZ06)资助.

详细信息

通讯作者:
范莹莹, e-mail: fyy416@163.com

中图分类号: P315.72+1
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出版历程
- 收稿日期: 2013-02-02
- 修回日期: 2013-11-07
- 发布日期: 2014-02-28

Electromagnetic phenomena before 2008 Wenchuan M_S8.0 and 2010 Yushu M_S7.1 earthquakes

Fan Yingying^1,2, ,,
Xie Tao³,
An Zhanghui^1,2,
Du Xuebin^1,2,
Tan Dacheng^1,2,
Liu Jun^1,2,
Chen Junying^1,2

1.
Lanzhou Base of Institute of Earthquake Science， China Earthquake Administration， Lanzhou 730000， China
2.
Lanzhou Institute of Seismology， China Earthquake Administration， Lanzhou 730000， China
3.
China Earthquake Networks Center， Beijing 100045， China

摘要

摘要: 应用全局小波能谱法对2008年四川汶川M_S8.0地震、 2010年青海玉树M_S7.1地震前地电、地磁场变化情况进行了分析研究. 结果表明： ① 在汶川地震震中周围的台站观测到震前地电、地磁场全局小波能谱值增大的现象; ② 青藏高原东北缘的代乾等3个地电、地磁台站在玉树地震前均发生显著的小波能谱增大的现象，震后恢复; ③ 对于上述两次大震周边地区的不同台站的不同测道，在震前多次出现谱值时间上同步增大或减少的现象; ④ 距玉树地震震中距离相同的山丹和古丰地电场台站，北南、北西测向长极距在地震前后能谱值的变化几乎一致. 基于上述分析，初步研究认为震源孕育激发的电磁辐射是造成震前电磁异常现象的主要原因.
- 汶川M_S8.0地震 /
- 玉树M_S7.1地震 /
- 地电场 /
- 地磁场 /
- 变化
Abstract: This paper studied the changes of the geoelectric and geomagnetic fields before the 2008 Wenchuan M_S8.0 earthquake in Sichuan Province and the 2010 Yushu M_S7.1 earthquake in Qinghai Province using the wavelet power spectrum analysis. The results showed that: ① The increased wavelet power value of the geoelectric and geomagnetic fields were observed by the geoelectric stations and the geoelectromagnetic stations near the epicenter before the Wenchuan earthquake. ② The wavelet power value of the geoelectric and geomagentic fields significantly increased in the TIA station and so on in the northeastern margin of Qinghai-Tibet Plateau before the Yushu earthquake， which recovered after the earthquake. ③ The phenomena that the wavelet power value synchronously increased/decreased were recorded more than once at the different channels of different stations near the above two earthquakes. ④ The changes of the wavelet power value were almost same observed by the NS and NW channels of Sandan station and Gufeng station, which are at the same distance from the epicenter of Yushu earthquake. Based on the above analysis， we drew the conclusion preliminarily that the geoelectromagnetic anomalies were mainly caused by the electromagnetic radiation stimulated by the focal development.
- 2008 Wenchuan M_S8.0 earthquake /
- 2010 Yushu M_S7.1 earthquake /
- geoelectric field /
- geomagnetic field /
- change

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图 1 震中(红色圆)和台站(黑色三角)分布图

Figure 1. Distribution of epicenters (red circles) and stations (black triangles)

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图 2 2009年12月3日古丰台地电场变化曲线图

(a) 原始数据分钟值曲线图； (b) 滤波后的曲线图

Figure 2. The curves of geoelectric field change for Gufeng station on December 3，2009

(a) The minute value curve based on original data； (b) The filtered minute value curve

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图 3 2008年汶川M_S8.0地震前后SHN台站地磁场、地电场全局小波能谱图

(a) 地磁场X分量; (b) 地磁场Y分量; (c) 地电场E₁E₂测道; (d) 地电场N₁S₁测道

Figure 3. Wavelet power spectrum of geomagnetic field and geoelectric field at the station SHN before and after the Wenchuan M_S8.0 earthquake

(a) X component of geomagnetic field; (b) Y component of geomagnetic field; (c) Measuring channel E₁E₂ of geoelectric field; (d) Measuring channel N₁S₁ of electric field

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图 4 2008年汶川M_S8.0地震前后TIA台站地电场全局小波能谱图

(a) 地电场N₁S₁测道; (b) 地电场N₁E₁测道; (c) 地电场S₂S₃测道

Figure 4. Wavelet power spectrum of geoelectric field at the station TIA before and after Wenchuan M_S8.0 earthquake

(a) Measuring channel N₁S₁; (b) Measuring channel N₁E₁; (c) Measuring channel S₂S₃

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图 5 2008年汶川M_S8.0地震前后山丹台地电场全局小波能谱图

(a) NS测道(长极距); (b) EW测道(长极距); (c) NW测道(长极距); (d) NS测道(短极距); (e) EW测道(短极距); (f) NW测道(短极距)

Figure 5. Wavelet power spectrum of geoelectric field at the station Shandan before and after Wenchuan M_S8.0 earthquake

(a) NS measuring channel (long distance); (b) EW measuring channel (long distance); (c) NW measuring channel (long distance); (d) NS measuring channel (short distance);(e) EW measuring channel (short distance); (f) NW measuring channel (short distance)

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图 6 2008年汶川M_S8.0地震前后武都台地电场全局小波能谱图

(a) NS测道(长极距); (b) EW测道(长极距); (c) NW测道(长极距); (d) NS测道(短极距); (e) EW测道(短极距); (f) NW测道(短极距)

Figure 6. Wavelet power spectrum of geoelectric field at the station Wudu before and after Wenchuan M_S8.0 earthquake

(a) NS measuring channel (long distance); (b) EW measuring channel (long distance);(c) NW measuring channel (long distance); (d) NS measuring channel (short distance); (e) EW measuring channel (short distance); (f) NW measuring channel (short distance)

下载: 全尺寸图片幻灯片

图 7 2010年玉树M_S7.1地震前后TIA台地电场全局小波能谱图

(a) N₁S₁测道; (b) N₁E₁测道; (c) S₂S₃测道; (d) S₂E₂测道; (e) N₁S₃测道; (f) WE₂测道

Figure 7. Wavelet power spectrum of geoelectric field at the station TIA before and after Yushu M_S7.1 earthquake

(a) N₁S₁ measuring channel; (b) N₁E₁ measuring channel; (c) S₂S₃ measuring channel; (d) S₂E₂ measuring channel; (e) N₁S₃ measuring channel; (f) WE₂ measuring channel

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图 8 玉树M_S7.1地震前后山丹台地电场全局小波能谱图

(a) NS测道(长极距);(b) EW测道(长极距); (c) NW测道(长极距); (d) NS测道(短极距); (e) EW测道(短极距); (f) NW测道(短极距)

Figure 8. Wavelet power spectrum of geoelectric field at the station Shandan before and after Yushu M_S7.1 earthquake

(a) NS measuring channel (long distance); (b) EW measuring channel (long distance); (c) NW measuring channel (long distance); (d) NS measuring channel (short distance); (e) EW measuring channel (short distance); (f) NW measuring channel (short distance)

下载: 全尺寸图片幻灯片

图 9 玉树M_S7.1地震前后古丰台地电场全局小波能谱图

(a) NS测道(长极距); (b) EW测道(长极距); (c) NW测道(长极距); (d) NS测道(短极距); (e) EW测道(短极距); (f) NW测道(短极距)

Figure 9. Wavelet power spectrum of geoelectric field at the station Gufeng before and after Yushu earthquake

(a) NS measuring channel (long distance); (b) EW measuring channel (long distance); (c) NW measuring channel (long distance); (d) NS measuring channel (short distance); (e) EW measuring channel (short distance); (f) NW measuring channel (short distance)

下载: 全尺寸图片幻灯片

图 10 2010年4月7—15日山丹台(a)、古丰台(b)地电场变化曲线和山丹台(c)、古丰台(d)小波变换滤波后曲线

Figure 10. The curves of geoelectric field changes for the stations Shandan (a) and Gufeng (b) as well as the filtered curves of geoelectric field for the stations Shandan (c) and Gufeng (d) using the wavelet transform from April 7 to 15，2010

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表 1 2008年3—6月四川汶川周围发生的M_S≥4.0地震

Table 1 M_S≥4.0 earthquakes around Wenchuan from March to June of 2008

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施引文献(8)

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