小江断裂带及邻区岩石圈磁场变化特征分析  

Analysis of Characteristics of Lithosphere Magnetic field Change Anomalies in Xiaojiang Fault and its Adjacent Area

作　　者：张忠龙 赵育飞 顾健 ZHANG Zhonglong ZHAO Yufei GU Jian(Yunnan Earthquake Agency, Kunming 650224, Yunnan, Chin)

机构地区：[1]云南省地震局,云南昆明650224

出　　处：《地震研究》2017年第3期372-376,共5页Journal of Seismological Research

基　　金：2015年地震行业科研专项--中国综合地球物理场观测-大华北地区(201508009)中协作任务<大华北地区西南缘地磁观测研究>;李建成院士站(2015IC015)

摘　　要：利用小江断裂及其邻区2015年和2016年共4期地磁总强度观测资料,获得了相邻期岩石圈磁场的深部、浅表和居里面变化,分析其变化特征。结果表明:(1)2015年8月—2016年3月该区域岩石圈磁场总体表现为磁场能量从南段、中段到北段逐渐增强;(2)在个旧附近,岩石圈磁场变化特征明显,在时间域上,磁场变化表现出增强、减弱、再增强的特征;(3)2015年8月—2016年3月,在岩石圈磁场的深部、浅表变化中,个旧附近都出现了磁场增强和减弱的明显边界。在岩石圈磁场的居里面变化中,个旧附近也出现了居里面起伏变化的明显边界。Based on the observation data of the 4 periods of total intensity of geomagnetism during 2015 and 2016 ob- tained from the Xiaojiang fault and its surrounding regions, the distribution of the variation of curiosive and the lithosphere magnetic field anomalies in the deep and shallow areas. Then the characteristics of the magnetic field of the Xiaojiang fault are analyzed. The results show that： （ 1 ） The lithosphere magnetic field anomalies of Xi- aojiang fault are generally enhanced from south, middle to north ; （2） In the vicinity of Gejiu and Ludian, the characteristics of the magnetic field of lithosphere anomalies are obvious. In the temporal domain, the energy of the magnetic field near Gejiu shows the characteristics of enhancement, attenuation and then enhancement. （3） From August, 2015 to March, 2016, the obvious boundary of the magnetic field energy enhancement and weakening appeared in the distribution of the lithosphere magnetic field anomalies in the deep and shallow areas.

关 键 词：小江断裂 岩石圈磁场 地磁总强度 磁场变化 

分 类 号：P318[天文地球—固体地球物理学]