2014年云南鲁甸6.5级、永善5.0级地震前岩石圈磁场局部异常特征分析
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摘要
利用2012~2014年南北地震带3期流动地磁矢量测量的准确可靠资料,计算得到了2012~2013年和2013~2014年相邻期岩石圈磁场的分布。分析结果表明,2014年8月3日鲁甸6.5级地震、8月17日永善5.0级地震前,川滇交界东部均存在岩石圈磁场的异常变化。同时,异常持续时间、空间范围与震级大小有一定关系,鲁甸地震前岩石圈磁场异常持续时间长、空间范围广,而永善地震则反之。
By using the accurate and reliable three-phases mobile geomagnetic vector observation data in the northsouth seismic belt during 2012 and 2014,we had got the distribution of the lithosphere magnetic field in the adjacent phases from 2012 to 2013 and from 2013 to 2014. The analysis results showed that there were the anomalous change of the lithosphere magnetic field before Ludian M6. 5 earthquake on Aug. 3 and Yongshan M5. 0earthquake on Aug. 17 in 2014 in the eastern part at the junction of Sichuan and Yunnan. At the same time,we considered that there is a certain relationship between anomalous duration or spatial extension and magnitude.The anomalous of lithosphere magnetic field occurred over a large area and lasted for a long time before Ludian M6. 5 earthquake,conversely,it occurred over a small area and lasted for a short time before the Yongshan M5. 0 earthquake.
By using the accurate and reliable three-phases mobile geomagnetic vector observation data in the northsouth seismic belt during 2012 and 2014,we had got the distribution of the lithosphere magnetic field in the adjacent phases from 2012 to 2013 and from 2013 to 2014. The analysis results showed that there were the anomalous change of the lithosphere magnetic field before Ludian M6. 5 earthquake on Aug. 3 and Yongshan M5. 0earthquake on Aug. 17 in 2014 in the eastern part at the junction of Sichuan and Yunnan. At the same time,we considered that there is a certain relationship between anomalous duration or spatial extension and magnitude.The anomalous of lithosphere magnetic field occurred over a large area and lasted for a long time before Ludian M6. 5 earthquake,conversely,it occurred over a small area and lasted for a short time before the Yongshan M5. 0 earthquake.
引文
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1房立华,吴建平,王未来,等.2014.云南鲁甸MS6.5地震余震重定位及其发震构造研究.地震地质(待刊).
1袁洁浩,顾左文,高金田,等.2014.沿蒙古S-D剖面的岩石圈磁异常观测研究.地震学报,(待刊).
陈斌.2011b.自然正交方法在地震地磁监测中的应用[J].地震研究,34(4):466-469.
顾春雷,张毅,顾左文,等.2012.华北地震区岩石圈磁异常场零值线与中强震震中分布关系[J].西北地震学报,25(2):174-179.
顾春雷,张毅,徐如刚,等.2010.地震前后岩石圈磁场变化特征分析[J].地球物理学进展,25(2):472-477.
顾左文,陈斌,高金田,等.2009.应用NOC方法研究中国地区地磁时空变化[J].地球物理学报,52(10):2602-2612.
皇甫岗,苏有锦,张建国,等.2014.新世纪滇缅交界大震活动研究[M].昆明:云南科技出版社.
皇甫岗.2014.永善5.0级地震与鲁甸6.5级地震属不同地质构造带[EB/O].(2014-08-17)[2014-09-23].http://yn.yunnan.cn/html/2014-08/17/content_3330961.htm.
倪喆,陈双贵,伊炜,等.2014a.芦山7.0级地震前后岩石圈地磁变化异常的研究[J].地震研究,37(1):61-65.
倪喆.2014b.洱源5.5级地震前后磁场变化异常特征分析[J].地震研究,37(3):471-476.
袁洁浩,陈斌,王粲,等.2014.2013年IAGA科学大会与岩石圈磁异常研究进展[J].国际地震动态,(3):32-38.
Gu Z.,Zhan Z.,Gao J.,et al.2006a.Application of GPS in GeomagneticSurvey[J].Earth Planets Space,58:72–729.
Gu Z.,Zhan Z.,Gao J.,et al.2006b.Geomagnetic Survey and Geomagnetic Model[J].Earth Planets Space,58:741-750.
Lanel R.A.,Hinze W.J..1998.The Magnetic Field of the Earth’s Lithosphere[M].New York:Cambridge University Press.
Maus S.,Rother M.,Hermant K.,et al.2006.Earth's Lithospheric Magnetic Field Determined to Spherical Harmonic Degree 90 fromCHAMP Satellite Measurements[J].Geophys.J.Int.,164(2):319-330.
Morner N.1986.The Lithospheric Geomagnetic Field:Origin and Dynamics[J].Phys.Earth Planet.Inter.,44(4):366-372.
Ni Z.,Yi W..2013.Lithospheric Magnetic Anomalous Area and Earthquake[C].Merida,Mexico:12th IAGA Scientific Assembly,291.
Thebault E.,Purucker M.,Whaler A.,et al.2010.The Magnetic Field ofthe Earth’s Lithosphere[J].Space Science Reviews,155(1-4):95-127.
Yuan J.,Gu Z.,Chen B.,et al.2013.The Lithospheric Magnetic Field along the Pingba-Lijiang Profile,China[C].Merida,Mexico:12thIAGA Scientific Assembly,285.
1房立华,吴建平,王未来,等.2014.云南鲁甸MS6.5地震余震重定位及其发震构造研究.地震地质(待刊).
1袁洁浩,顾左文,高金田,等.2014.沿蒙古S-D剖面的岩石圈磁异常观测研究.地震学报,(待刊).
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