云南ELF电磁观测资料的异常特征分析
|
摘要
通过对云南省通海地震台2009年1月至2010年12月ELF电磁观测数据的处理分析,研究云南省及邻区中强地震前后,电磁场强度、视电阻率的变化特征。结果表明,1Hz、39Hz的电磁场功率谱在多次地震临震前分别比正常月份约大0.2～1.4个数量级。表现为在地震及余震序列中,电、磁场功率谱有明显的突跳,变化幅度与震级大小、震中距等有关;同时视电阻率的异常变化也比较明显。
Located in an earthquake-prone region,the geological structures in Yunnan Province are com- plex. Taking into account that Tonghai County is located at the intersection of Xiaojiang Fault and Honghe Fault,an F - 4M ELF electromagnetic instrument was installed at Tonghai seismic station, which has produced continuous reliable data. The author collected the data and information of the year 2009 & 2010,and did analysis on the variation characteristics of both geomagnetic fields and electrical resistivity. The result shows that the 1Hz and 39Hz electromagnetic power spectra are 0. 2 to 1. 4 or- ders of magnitude higher than the normal values immediately before many earthquakes. The anomalies are represented by the abrupt changes of the electric and magnetic field power spectra in earthquake and aftershock sequences,and the amplitude of change is related to the size of earthquake magnitude and the epicentral distance. The electrical resistivity also changes obviously. So,further research on the anomalous characteristics of ELF electromagnetic data will be meaningful to the use of this instru- ment in earthquake prediction in the future.
Located in an earthquake-prone region,the geological structures in Yunnan Province are com- plex. Taking into account that Tonghai County is located at the intersection of Xiaojiang Fault and Honghe Fault,an F - 4M ELF electromagnetic instrument was installed at Tonghai seismic station, which has produced continuous reliable data. The author collected the data and information of the year 2009 & 2010,and did analysis on the variation characteristics of both geomagnetic fields and electrical resistivity. The result shows that the 1Hz and 39Hz electromagnetic power spectra are 0. 2 to 1. 4 or- ders of magnitude higher than the normal values immediately before many earthquakes. The anomalies are represented by the abrupt changes of the electric and magnetic field power spectra in earthquake and aftershock sequences,and the amplitude of change is related to the size of earthquake magnitude and the epicentral distance. The electrical resistivity also changes obviously. So,further research on the anomalous characteristics of ELF electromagnetic data will be meaningful to the use of this instru- ment in earthquake prediction in the future.
引文
关华平,张宏魁,等.1999.怀来台震前超低频电场与地震关系研究[J].地震,19(2):142—148.GUAN Hua-ping,ZHANG Hong-kui,et al.1999.Study of electromagnetic radiation measured at Huailai station,HebeiProvince and its correlation to earthquake[J].Earthquake,19(2):142—148(in Chinese).
高曙德,汤吉,杜学彬,等.2010.汶川8.0级地震前后电磁场的变化特征[J].地球物理学报,53(3):512—513.GAO Shu-de,TANG Ji,DU Xue-bin,et al.2010.The change characteristics of electromagnetic field before to after Wen-chuan MS8.0earthquake[J].Chinese J Geophys,53(3):512—513(in Chinese).
毛桐恩,胥广银,范思源,等.1999.地电阻率各向异性度的动态演化图像与地震孕育过程[J].地震学报,21(2):180—186.MAO Tong-en,XU Guang-yin,FAN Si-yuan,et al.1999.Dynamic evolution patterns of ground resistivity anisotropy andthe seismogenic process[J].Acta Seismologica Sinica,21(2):180—186(in Chinese).
钱复业,赵玉林,黄燕妮.1996.地电阻率各向异性参量计算法及地震前兆实例[J].地震学报,18(4):480—488.
QIAN Fu-ye,ZHAO Yu-lin,HUANG Yan-ni.1996.Calculation of the parameters of georesistivity anisotropy and casehistory of earthquake precursors[J].Acta Seismologica Sinica,19(4):617—627.
孙维怀.2008.通海地磁台地磁特征线与邻近地区地震的对应关系研究[J].地震地磁观测与研究,29(6):6—16.SUN Wei-huai.2008.Researching on the corresponding relations between the geomagnetism features line at TonghaiSeismic Station and the earthquake in neighborhood[J].Seismological and Geomagnetic Observation and Re-search,29(6):6—16(in Chinese).
汤吉,詹艳,王立凤,等.2008.5月12日汶川8.0级地震强余震观测的电磁同震效应[J].地震地质,30(3):739—745.TANG Ji,ZHAN Yan,WANG Li-feng,et al.2008.Coseismic signal associated with aftershock of the MS8.0Wenchuanearthquake[J].Seismology and Geology,30(3):739—745(in Chinese).
赵国泽,陈小斌,肖骑彬,等.2009.汶川MS8.0级地震成因三“层次”分析:基于深部电性结构[J].地球物理学报,52(2):553—563.ZHAO Guo-ze,CHEN Xiao-bin,XIAO Qi-bin,et al.2009.Generation mechanism of Wenchuan strong earthquake of MS8.0inferred from EM measurements in three levels[J].Chinese J Geophys,52(2):553—563(in Chinese).
赵国泽,陈小斌,王立凤,等.2008.青藏高原东边缘地壳“管流”层的电磁探测证据[J].科学通报,53(3):345—350.
ZHAO Guo-ze,CHEN Xiao-bin,WANG Li-feng,et al.2008.Evidence of crustal‘channel flow’in eastern margin of Ti-bet plateau from MT measurements[J].Chinese Science Bulletin,52(12):1887—1893.
Bleier T,Freund F.2005.Impending earthquakes have been sending us warning signals and people are starting to listen[J].IEEE Spectrum Int,12:17—21.
Casolino M.2005.Sileye23/LAZIO collaborations Status and results of the LAZIO2SIRAD and Sileye3/Alteino experi-ments aboard the ISS[R].10thWRMISS Workshop on Radiation Monitoring for the International Space Station.September,Japan.
Eftaxias K,Kapiris P,Polygiannakis J,et al.2001.Signature of pending earthquake from electromagnetic anomalies[J].Geophysical Research Letters,28(17):3321—3324.
Sharma S P,Baranwal V C.2005.Delineation of groundwater-bearing fracture zones in a hard rock area integrating very low frequency electromagnetic and resistivity data[J].Journal of Applied Geophysics,57:155—166.
Uyeda S,Hayakawa M,Nagao,et al.2002.Electric and magnetic phenomena observed before the volcano-seismic activi-ty in2000in the Izu Island Region,Japan[J].Proceedings of the National Academy of Sciences,USA,99:7352—7355.
高曙德,汤吉,杜学彬,等.2010.汶川8.0级地震前后电磁场的变化特征[J].地球物理学报,53(3):512—513.GAO Shu-de,TANG Ji,DU Xue-bin,et al.2010.The change characteristics of electromagnetic field before to after Wen-chuan MS8.0earthquake[J].Chinese J Geophys,53(3):512—513(in Chinese).
毛桐恩,胥广银,范思源,等.1999.地电阻率各向异性度的动态演化图像与地震孕育过程[J].地震学报,21(2):180—186.MAO Tong-en,XU Guang-yin,FAN Si-yuan,et al.1999.Dynamic evolution patterns of ground resistivity anisotropy andthe seismogenic process[J].Acta Seismologica Sinica,21(2):180—186(in Chinese).
钱复业,赵玉林,黄燕妮.1996.地电阻率各向异性参量计算法及地震前兆实例[J].地震学报,18(4):480—488.
QIAN Fu-ye,ZHAO Yu-lin,HUANG Yan-ni.1996.Calculation of the parameters of georesistivity anisotropy and casehistory of earthquake precursors[J].Acta Seismologica Sinica,19(4):617—627.
孙维怀.2008.通海地磁台地磁特征线与邻近地区地震的对应关系研究[J].地震地磁观测与研究,29(6):6—16.SUN Wei-huai.2008.Researching on the corresponding relations between the geomagnetism features line at TonghaiSeismic Station and the earthquake in neighborhood[J].Seismological and Geomagnetic Observation and Re-search,29(6):6—16(in Chinese).
汤吉,詹艳,王立凤,等.2008.5月12日汶川8.0级地震强余震观测的电磁同震效应[J].地震地质,30(3):739—745.TANG Ji,ZHAN Yan,WANG Li-feng,et al.2008.Coseismic signal associated with aftershock of the MS8.0Wenchuanearthquake[J].Seismology and Geology,30(3):739—745(in Chinese).
赵国泽,陈小斌,肖骑彬,等.2009.汶川MS8.0级地震成因三“层次”分析:基于深部电性结构[J].地球物理学报,52(2):553—563.ZHAO Guo-ze,CHEN Xiao-bin,XIAO Qi-bin,et al.2009.Generation mechanism of Wenchuan strong earthquake of MS8.0inferred from EM measurements in three levels[J].Chinese J Geophys,52(2):553—563(in Chinese).
赵国泽,陈小斌,王立凤,等.2008.青藏高原东边缘地壳“管流”层的电磁探测证据[J].科学通报,53(3):345—350.
ZHAO Guo-ze,CHEN Xiao-bin,WANG Li-feng,et al.2008.Evidence of crustal‘channel flow’in eastern margin of Ti-bet plateau from MT measurements[J].Chinese Science Bulletin,52(12):1887—1893.
Bleier T,Freund F.2005.Impending earthquakes have been sending us warning signals and people are starting to listen[J].IEEE Spectrum Int,12:17—21.
Casolino M.2005.Sileye23/LAZIO collaborations Status and results of the LAZIO2SIRAD and Sileye3/Alteino experi-ments aboard the ISS[R].10thWRMISS Workshop on Radiation Monitoring for the International Space Station.September,Japan.
Eftaxias K,Kapiris P,Polygiannakis J,et al.2001.Signature of pending earthquake from electromagnetic anomalies[J].Geophysical Research Letters,28(17):3321—3324.
Sharma S P,Baranwal V C.2005.Delineation of groundwater-bearing fracture zones in a hard rock area integrating very low frequency electromagnetic and resistivity data[J].Journal of Applied Geophysics,57:155—166.
Uyeda S,Hayakawa M,Nagao,et al.2002.Electric and magnetic phenomena observed before the volcano-seismic activi-ty in2000in the Izu Island Region,Japan[J].Proceedings of the National Academy of Sciences,USA,99:7352—7355.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心