摘要
本文利用法国DEMETER电磁卫星的IDP粒子探测器数据,以汶川地震为例,在尽可能排除太阳活动和地磁活动干扰的情况下,分析了汶川地震前后高能粒子日变化情况,探索其作为汶川地震前兆信息的可能性.分别采用了时间序列统计分析、空间对比分析和重访轨道对比分析等方法.结果显示5月6日100～600KeV能谱段的粒子通量增幅强度高达6σ,异常区域集中在震中的西北部区域约47°N～53°N,91°E～93°E之间,考虑到磁壳指数L约1.8～2.0之间,这一增幅现象可能是由于高能质子受地磁场扰动影响向西加速漂移的结果.同时对比6日100～500KeV能谱段通量与其前三个月的重访轨道背景场,得出6日谱通量明显高于其重访轨道背景场一个数量级.最后,对于以上现象可能的物理机制进行了相关讨论.
his paper aims to rule out the sun activity and geomagnetic disturbance as much as possible,we analyzed the data close-by Wenchuan earthquake（May 12,2008） and the flux data detected by IDP,which was installed on board of the DEMETER satellite to study the possibility that energetic partical anomalies as the precursor information of earthquakes.We found that the spectrum at 100～600 KeV energy range in the regin（47°N～53°N,91°E～ 93°E） on May 6 is obviously increased to 6σ.Considering the L value at 1.8～2.0,so we think the local anomalies is because of the drift of protons from east to west.While we contrast the May 6 flux data to the last three months bankground data,learning that the May 6 flux is a higher order of magnitude.At last,we discuss the possible physical mechanism of the results above.
出处
《地球物理学进展》
CSCD
北大核心
2012年第6期2279-2288,共10页
Progress in Geophysics
基金
国际科技合作项目(2009DFA21480)资助
关键词
DEMETER卫星
汶川地震
高能粒子
地震异常特征
DEMETER satellite
Wenchuan earthquake
energetic partical
the anomaly characteristics of earthquake
