地震研究

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 north-south 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 M5.0 earthquake 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.

引言
1 地磁测量及数据处理
2 地震前岩石圈磁场异常分布
3 讨论与结论

图1 云南及周边地区流动地磁矢量测点分布<br/>Fig.1 Distribution of flow geomagnetic vector measuring points in Yunnan and its adjacent area

图1 云南及周边地区流动地磁矢量测点分布
Fig.1 Distribution of flow geomagnetic vector measuring points in Yunnan and its adjacent area

图2 2012～2013年云南及周边地区岩石圈磁场分布(○:鲁甸地震岩石圈磁场异常范围; ★:地震震中)(a)水平矢量;(b)垂直矢量(c)总强度<br/>Fig.2 The distribution of lithosphere magnetic field in Yunnan and its adjacent area during 2012 and 2013(○:the anomalous spatial extension of lithosphere magnetic field before Ludian MS6.5 earthquake; ★:epicenter)(a)horizontal vector;(b)vertical vector;(c)total intensity

图2 2012～2013年云南及周边地区岩石圈磁场分布(○:鲁甸地震岩石圈磁场异常范围; ★:地震震中)(a)水平矢量;(b)垂直矢量(c)总强度
Fig.2 The distribution of lithosphere magnetic field in Yunnan and its adjacent area during 2012 and 2013(○:the anomalous spatial extension of lithosphere magnetic field before Ludian MS6.5 earthquake; ★:epicenter)(a)horizontal vector;(b)vertical vector;(c)total intensity

图3 2013～2014年云南及周边地区岩石圈磁场分布(○鲁甸地震前岩石圈磁场异常范围; ○永善地震前岩石圈磁场异常范围; ★地震震中)(a)水平矢量;(b)垂直矢量(c)总强度<br/>Fig.3 The distribution of lithosphere magnetic field in Yunnan and its adjacent area during 2013 and 2014(○:the anomalous spatial extension of lithosphere magnetic field before the Ludian MS6.5 earthquake; ○:the anomalous spatial extension of lithosphere magnetic field before the Yongshan MS5.0 earthquake; ★:epicenter)(a)horizontal vector;(b)vertical vector;(c)total intensity

图3 2013～2014年云南及周边地区岩石圈磁场分布(○鲁甸地震前岩石圈磁场异常范围; ○永善地震前岩石圈磁场异常范围; ★地震震中)(a)水平矢量;(b)垂直矢量(c)总强度
Fig.3 The distribution of lithosphere magnetic field in Yunnan and its adjacent area during 2013 and 2014(○:the anomalous spatial extension of lithosphere magnetic field before the Ludian MS6.5 earthquake; ○:the anomalous spatial extension of lithosphere magnetic field before the Yongshan MS5.0 earthquake; ★:epicenter)(a)horizontal vector;(b)vertical vector;(c)total intensity

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备注

引言

1 地磁测量及数据处理

2 地震前岩石圈磁场异常分布

3 讨论与结论

期刊信息