The Research On The Key Problems For The Integration Of Technical System For National Center Of China Digital Seismic Network

The integration of technical system for the center of digital seismic network should use the techniques of earthquake monitoring and computer, which is the result of developing of digital seismic network. There are many problems in integrating the National Center of China Digital Seismic Network (NCCDSN). However, the thesis only focus on three key problems, which are the stability of the technical system, the national big earthquake quick report, and the seismic data management and service.1 The research on the problem of the stability of the technical systemThe thesis analyses the relationship among stability, complexity, and automation of technical system. Then it compares the real time running system and die studying system, and gets the conclusion that integrating the real time running system should focus on the interfaces of input and output. After that it divides the technical system's stability into five categories: the hardware stability, the software stability, the seismic professional system's stability, the function's stability, and the product's stability. Lastly, it raises four methods to improve the technical system's stability,: which are improving the single system stability, the online backup system, the offline backup system, and parallel running system.The all four methods are used to improve the NCCDSN technical system's stability. The RAID"is used to improve the storage system's stability. The HACMP is used to improve the core server's stability. The parallel running system is used to improve the stability of seismic professional system. The offline backup system is used to improve the whole system's stability.2 The research on the problem of the national big earthquake quick reportThe origin time searching method is raised on the basis of epicenter searching method and computer screen picturing method. According to the origin time searching method, the old anolog computer screen picturing system is revised. Then the new computer screen picturing system is integrated into the real time processing system and interactive processing system to form the national big earthquake quick report system. The national big earthquake quick report system makes earthquake quick reporting easily.The national big earthquake quick report system is difficult to locate the far earthquake, hi order to improve the quality of locating far earthquake, the international seismic station's near real time data are collected using the LISS. It improves die quality of far earthquake locating, and shortens the reporting time.3 The research on the problem of the seismic data management and serviceThe seismic data is newly divided into three categories: the status data, the observing data, and die analysis data. The status data describe the object's status, which vary with time. The observing data are observed by the seismograph, which do not vary with time. The analysis data's production should need people's processing.The data storage management strategies are made according to the different characteristics of the three kinds of data. The observing data's volume is very big and their attributes are simple, so theycan be managed by file system. The analysis data's volume is not big and their attributes are complex, so they can be managed by database system. The status data should be kept in both file system and database system. The Web site is established to provide the same service interface for clients.