DEMETER卫星监测到的海地地震前电离层扰动  

Ionospheric Disturbances Observed on DEMETER Satellite Prior to the 2010 M_S7.1 Haiti Earthquake

作　　者：焦其松[1,2] 颜蕊[1] 张景发[1] 

机构地区：[1]中国地震局地壳应力研究所,北京100085 [2]山东科技大学地质学院,山东青岛266510

出　　处：《地震》2011年第2期68-78,共11页Earthquake

基　　金：中国地震局行业专项(200808034);山东科技大学2010-2011年度研究生科技创新基金项目(YCA100313)资助

摘　　要：本文利用法国DEMETER卫星观测到的电离层数据,对2010年1月12日加勒比海地区海地太子港附近发生的MS7.1地震震前电离层扰动进行了探索性研究。通过对电磁场频谱、等离子体数密度、温度等物理参量的分析,探讨了电离层变化与地震的关系。研究结果表明,海地地震前出现的异常电磁现象的空间效应是清楚的,震前几小时磁赤道峰存在剧烈扰动,震中附近电场分量E12低频谱密度有增强现象。临震前1天和临震前3天在震中+5°范围电子数密度(Ne)出现异常,震前8天氧离子(O+)数密度在震中上空出现了异常现象。震前震中区上空电磁场VLF在40 Hz和120 Hz等低频点出现清晰的电场异常扰动,震前出现的这种变化可能与地震有关。Based on the ionosperic data observed on Demeter,we did some exploratory research on the ionospheric disturbances prior to the Haiti MS7.1 earthquake on Jan.12,2010.By analysing electromagnetic frequency,plasma density and temperature,the relation between the ionospheric disturbances and the earthquake was discussed.It is showed that the electromagnetic anomalies were clear prior to the Haiti earthquake.The magnetic equator peak value was severely disturbed and the low frequency spectral density of the electric field E12 increased.The density of O＋ near the epicenter changed abnormally.The electromagnetic low frequency（VLF 40 Hz and 120 Hz） anomalies also clearly appeared over the epicenter before the earthquake.

关 键 词：DEMETER卫星 电离层扰动 海地地震 

分 类 号：P315[天文地球—地震学]