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.     

海洋走航式单边连续观测地震折射波Δt解释方法--1种新的浅层折射单支时距曲线解释方法

在浅层工程折射地震测量中 ,通常采用相遇观测系统采集数据和相应的解释方法进行解释 ;对于单边观测采集方法由于与其相应的解释方法较少而少被采用。本文提出 1种方法简单、精度可靠、可直接利用同一点相邻 2排列 2次观测的初至折射时间并适合于海洋走航式单边连续观测系统的折射初至资料解释方法。其精度基本与同观测段的采用相遇观测的差异时距方法解释的精度十分接近。该方法即适合于人工解释又适合于计算机自动解释。     

印尼地震破坏力巨大将永久改变该地区地图形态

美国地球物理学家认为，2004年12月26日发生在印尼海域的地震所引发的海啸威力之大，甚至使地球在轨道运行时都发生了震颤．并且永远改变了该地区的地图形态。     

涡阳-凤台地区地震活动和地震构造

本文运用深浅部构造对比研究，结合历史地震资料、中强震观测资料分析和地震活动性分析结果，探讨中强震过渡区地震构造环境和地震韵律的研究途径，以涡阳～凤台地区为例，对其进行综合剖析，推演未来中强震发生的空间部位，并预测该地区未来可能发生地震的震源深度、震级、地震长轴衰减方向、发生时间等参数。     

宁波金鸡山地区地震活动性及震害研究

在地震危险性分析的基础上，运用剪切波速法，逐步判别法等预测震害，这对唐山地震前缺乏标贯资料的高烈度城镇区，需补充预测时，提供了新的途径。