The Statistical Analysis of Migration of Strong Earthquakes-Taking the North China Region asan Example

The migration of strong earthquakes is an important research topic because the migration phenomena reflect partly the seismic mechanism and involve the prediction of tendency of seismic activity. Research on migration of strong earthquakes has mostly focused on finding the phenomena. Some attempts on getting regularity were comparatively subjective. This paper suggests that there should be indices of migration in earthquake dataset and the indexes should have statistical meaning if there is regularity in the migration of strong earthquakes. In this study, three derivative attributes of migration, i.e., migration orientation, migration distance and migration time interval, were statistically analyzed. Results in the North China region show that the migration of strong earthquakes has statistical meaning. There is a dominant migration orientation (W by S to E by N), a dominant distance ( ≤ 100kin and on the confines of 300 ～ 700km), and a dominant time interval ( ≤ la and on the confines of 3 - 4a). The results also show that the migration will differ slightly with different magnitude range or earthquake activity phase.     

Galileo系统及其在中国的应用

较详细地介绍了Galileo系统的全面体系结构、频率设计、服务内容及其广泛的应用范围，指出了它与GPS系统相比的优点，并对开发和增强Galileo系统在我国多层次、全方位的应用提出了建议。     

89C51实现光电经纬仪摄影机目标距离的显示

介绍一种以89C51为核心，通过AD和LED，实现光电经纬仪摄影机目标距离显示的方法。该方法提出了一些新的设计方案，从而使整个系统结构简单，运行可靠。     

勇创一流谱新篇——开封市城区国土资源分局建设剪影

位于开封市东郊的开封市城区国土资源分局，是开封市区域划分、国土资源系统垂直管理后我省唯一的一个城区国土资源管理部门。局党组在市国土资源局的领导下，带领全局干鄙职工，以服务全市经济社会发展为中心，正确处理资源保护与保障的关系，取得了显著成绩。连续两年保持“省级文明单位”称号，今年又顺利通过了“省级卫生先进单位”的检查验收，并荣获市地房系统年度目标管理先进单位。     

收藏地震

这是一个非常引人的博物馆,看到你们在地震研究中深入而重要的工作是一个非常有趣的经历。——国际大学校长、联合国北美理事会前任理事长唐詹斯兰州地震博物馆创造性的劳动,出色的工作,将永远载入地震工作史册。——国家地震局副局长陈章立