Pre-Seismic Geomagnetic Anomaly Using Second Data and Its Significance in Earthquake Short-Term Prediction
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摘要: 通过分析6个强震震中附近地磁Z分量秒数据的处理结果显示: 一些强震在震前反复出现较强的地磁异常现象.此现象在震前百余天至四十余天和临震前出现; 地磁场的特大异常持续天数随震级的增大而增大, 其异常天数与总体天数的比值随着震级的增大而增大.该特性对于短临地震预报预警及防震减灾具有一定意义.Abstract: According to the result of geomagnetic data, great abnormal magnetic phenomenon occurring repeatedly before some significant earthquakes were found. This kind of phenomenon occurs about from over forty to a hundred days before. This pre-seismic geomagnetic anomaly lasts long as the magnitude increases. The nature of geomagnetic data before earthquakes has something to do with earthquake prediction and may be applied to precaution against earthquake disasters.
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Key words:
- macroseism /
- magnetic anomaly /
- short imminent earthquake prediction /
- earthquake
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表 1 2008年始满足条件的几处地震
Table 1. Earthquakes from 2008 till now
编号 发震时刻(UTC) 经度 纬度 震级Mw 深度(km) 参考位置 可用台站 震中距(km) 1 2008-05-12 T06∶28∶01.57 103.322°E 31.002°N 7.9 19 四川省汶川县 成都台 58.2 2 2008-08-30 T08∶30∶53.01 101.889°E 26.241°N 6.0 11 四川省攀枝花市 南山台 37.1 3 2008-10-06 T08∶30∶45.57 90.350°E 29.807°N 6.3 12 西藏自治区当雄县 拉萨台 78.1 4 2009-07-09 T11∶19∶16.24 101.095°E 25.632°N 5.7 7 云南省姚安县 楚雄台 80.4 5 2010-04-13 T23∶49∶38.33 96.548°E 33.165°N 6.9 17 青海省玉树县 玉树台 31.0 6 2013-04-20 T00∶02∶47.50 102.937°E 30.277°N 6.6 14 四川省芦山县 成都台 107.9 表 2 5处地磁台站数据选取的正常年与异常年
Table 2. Normal years and abnormal years for 5 geomagnetic observatories
站台 正常时段 异常时段 成都台 2012年 2008年 南山台 2011年 2008年 拉萨台 2009年 2008年 楚雄台 2010年 2009年 成都台 2012年 2013年 -
[1] Chen, C.H., Hsu, H.L., Wen, S., et al., 2013. Evaluation of Seismo-Electric Anomalies Using Magnetic Data in Taiwan. Natural Hazards & Earth System Sciences, (13): 597-604. doi: 10.5194/nhess-13-597-2013 [2] Fraser-Smith, A.C., Bernardi, A., McGill, P.R., et al., 1995. Low-Frequency Magnetic Field Measurements near the Epicenter of the Ms 7.1 Loma Prieta Earthquake. Geophysical Research Letters, 17(9): 1465-1468. doi: 10.1029/GL017i009p01465 [3] Kosuke, H., 2011. Ionospheric Electron Enhancement Preceding the 2011 Tohoku-Oki Earthquake. Geophysical Research Letters, 38(17). doi: 10.1029/2011GL047908 [4] Liu, J.Y., Chen, Y.I., Chuo, Y.J., et al., 2001. Variations of Ionospheric Total Electron Content during the Chi-Chi Earthquake. Geophysical Research Letters, 28(7): 1383-1386. doi: 10.1029/2000GL012511 [5] Liu, J.Y., Chuo, Y.J., Shan, S.J., et al., 2004. Pre-Earthquake Ionospheric Anomalies Registered by Continuous GPS TEC Measurements. Annales Geophysicae, 22(5): 1585-1593. doi: 10.5194/angeo-22-1585-2004 [6] Moore, G.W., 1964. Magnetic Disturbances Preceding the 1964 Alaska Earthquake. Nature, 203(4944): 508-509. http://www.nature.com/articles/203508b0 [7] Wienert, K.A., 1970. Notes on Geomagnetic Observatory and Survey Practice. Unesco, Belgium. [8] Zeng, X.P., Lin, Y.F., Zhu, Z.J., et al., 1995. Study on Electric Variations of Media in Epicentral Area by Geomagnetic Transfer Functions. Acta Seismologica Sinica, 8(3): 413-418. doi: 10.1007/BF02650569 [9] Zeng, X.P., Zheng J.A., Wang Z.Y., et al., 2011. Large Geomagnetic Anomaly of Impending Earthquake Gives a Possibility in Earthquake Early Warning. Engineering Science, 13(4): 48-53. http://en.cnki.com.cn/Article_en/ http://search.cnki.net/down/default.aspx?filename=GCKX201104008&dbcode=CJFD&year=2011&dflag=pdfdown