【摘要】 利用美国地球物理数据中心(NGDC)构建的NGDC-EMM-720-V3地磁模型,计算了汶川地震、澜沧—耿马地震和通海地震的主震及余震序列分布带的岩石圈磁场强度,绘制磁异常图,分析这3个地震的主震及其余震震中分布与岩石圈磁场的关系.研究表明,这3个地震主震震中均在弱磁异常区,余震序列分布带的岩石圈磁场强度整体也较弱.汶川地震与通海地震岩石圈磁场特征相似,澜沧—耿马地震与二者稍有差别.更多还原

【Abstract】 NGDC-EMM-720-V3 magnetic field modle provided by National Geophysical Data Center(NGDC) is used in this paper to compute the lithospheric magnetic field values of aftershocks distribution zones of Wenchuan earthquake,Lancang-Gengma earthquake and Tonghai earthquake.Using the lithoshperic magnetic field data we can draw magnetic anomaly maps.Analysis the relationship between the three earthquakes and their aftershocks’ epicenter distribution and lithospheric magnetic field.According to analysis,epicenters of three chosen earthquakes are in low magnetic anomaly areas.Lithospheric magnetic field values of aftershocks distribution zones are lower in general.The lithospheric magnetic field feature of Wenchuan earthquake and Tonghai earthquake are similar while Lancang-Gengma earthquake is differ from the other two earthquakes.更多还原