Analysis of a great many data shows that some strong earthquake will arouse seismogenic zone loading and bring the increase of stress , accelerate accumulation of nonlinear strain of medium . it will make the earthquake source rupture of high stress status in unsteadiness in advance , which resulting the proceeding earthquake occur in advance 表明：某次强震活动可以引起某些孕震区的加载，介质非线性应变积累加速，使处于高应力状态的震源失稳提前进入不稳定状态，后续强震提前发生，即强震之间存在着时间、空间上的关联性。
These systems have created vast benefit and earned markets for enterprises . but they brought about much independence " automated island " with different forms of data store and process , so the information of system cannot be transferred and exchanged automatically . as the result , the integrity and safety of product data in various departments and every developing phase cannot be guaranteed , and communication of product information is handicapped 但由于这些相互独立的系统的数据存储和处理方式不同，不能实现各系统间信息的自动传递与交换，从而形成了“信息孤岛” ，使处于企业各部门和产品开发各阶段的数据的完整性、安全性、以及与船舶产品相关信息的正常流动难以得到保障。
