河北省流动地磁观测异常特征分析
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摘要
运用1986—2009年河北省流动地磁观测资料,分析其地磁总场强度测值时间变化与空间分布特征,找出流磁异常特征。结果表明:流动地磁变化与该区的地震活动存在一定关系,且震前异常多在震前1—2年出现,δ_F值存在"连续大幅上升—临震大幅转折下降"的异常变化特征。
In this study,the temporal variation and spatial distribution characteristics of geomagnetic total intensity in mobile geomagnetic observation were analyzed using the mobile geomagnetic observation data from Hebei province between 1986 and 2009;in addition,the characteristics of mobile geomagnetic anomalies were discussed.The results show that there is a certain relation between the mobile geomagnetic changes and earthquakes in the area.The precursory anomalies usually appear 1~2 years before the earthquake.The δ_F value has the variation characteristic of"continuous sharp rise—impending sharp decline."The bigger the magnitude the larger is the geomagnetic anomaly.In this study,only M_L≥4.0 earthquakes occurring in the monitoring area can reveal seismic change information that can better predict the earthquake.
In this study,the temporal variation and spatial distribution characteristics of geomagnetic total intensity in mobile geomagnetic observation were analyzed using the mobile geomagnetic observation data from Hebei province between 1986 and 2009;in addition,the characteristics of mobile geomagnetic anomalies were discussed.The results show that there is a certain relation between the mobile geomagnetic changes and earthquakes in the area.The precursory anomalies usually appear 1~2 years before the earthquake.The δ_F value has the variation characteristic of"continuous sharp rise—impending sharp decline."The bigger the magnitude the larger is the geomagnetic anomaly.In this study,only M_L≥4.0 earthquakes occurring in the monitoring area can reveal seismic change information that can better predict the earthquake.
引文
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[2]苏树朋,李博,宋志刚,等.晋冀蒙地磁总强度加密区观测资料分析[J].地震地磁观测与研究,2016,37(2):84-89.SU Shupeng,LI Bo,SONG Zhigang,et al.Analysis and Application of the Observation Data of Hebei,Shanxi and Inner Mongolia Geomagnetic Total Intensity Encryption Region[J].Seismological and Geomagnetic Observation and Research,2016,37(2):84-89.
[3]解用明,高登平,王艳荣,等.近年地磁场的长期变化特征[J].华北地震科学,2007,25(1):1-5.XIE Yongming,GAO Dengping,WANG Yanrong,et al.Characteristics of Long Term Variation of Geomagnetic Field in Recent Years[J].North China Earthquake Sciences,2007,25(1):1-5.
[4]苏树朋.流动地磁异常信息提取的参考值确定[J].大地测量与地球动力学,2010,30(增刊Ⅰ):44-49.SU Shupeng.Determination of Reference Value for Abnomal Information Extraction in Mobile Geomagnetic Survey[J].Journal of Geodesy and Geodynamics,2010,30(Supp.Ⅰ):44-49.
[5]乔子云,张建国,焦成丽.冀豫环流动磁测异常与中等地震关系研究[J].地震地磁观测与研究,2009,4(30):1-6.QIAO Ziyun,ZHANG Jianguo,JIAO Chenli.Relationship of the Mobile Geomagnetic Anomalies in Hebei and Henan Circulation with Medium Earthquake in Surrounding Area[J].Seismological and Geomagnetic Observation and Research,2009,4(30):1-6.
[6]靳玉贞,林木金,范晓瑜,等.山西流动地磁观测异常与中等地震关系研究[J].山西地震,2015(3):1-6.JIN Yuzhen,LIN Mujin,FAN Xiaoyu,et al.Relationship between Anomalies of Mobile Geomagnetic Observation and Moderately Strong Earthquakes in Shanxi[J].Earthquake Resrarch in Shanxi,2005(3):1-6.
[7]刘义高,胡诚,张明,等.流动地磁测量中地震异常信息的探索[J].西北地震学报,2004,26(4):353-356.LIU Yigao,HU Cheng,ZHANG Ming,et al.Exploration for Anomalous Information in Mobile Geomagnetic Survey[J].Northwestern Seismological Journal,2004,26(4):353-356.
[8]李华,黄莉菁,许仪西.2007年3月3日福建顺昌4.9、4.7级地震前福建流动地磁观测资料异常分析[J].西北地震学报,2009,29(3):267-274.LI Hua,HUANG Lijing,XU Yixi.Analysis on the Anomalies in Mobile Geomagnetic Survey Before Shunchang M4.9、4.7Earthquakes on March 13,2007in Fujian Province[J].Northwestern Seismological Journal,2009,29(3):267-274.
[9]赵从利,詹志佳,高金田,等.北京地磁测网调整与地震预测研究[J].西北地震学报,2003,25(3):275-280.ZHAO Congli,ZHAN Zhijia,GAO Jintian,et al.Readjustment of Geomagnetic Survey Network and Research on Earthquake Prediction in Beijing Area[J].Northwestern Seismological Journal,2003,25(3):275-280.
[10]詹志佳,高金田,赵从利,等.G856质子旋进磁力仪及其在野外震磁测量中的应用[J].西北地震学报,2000,22(1):74-78.ZHAN Zhijia,GAO Jintian,ZHAO Congli,et al.G-856Proton Precession Magnetometer and Its Application in Field Seismomagnetic Survey[J].Northwestern Seismological Journal,2000,22(1):74-78.