Abstract: The data structure of the EQ3 format of seismic catalogue is formally brought into open the first time, which is defined in General Seismic Application System called SuperSeis for short. The definition of the EQ3 format in C program language is introduced, and the comparison of EQ3 and other used formats such as EQT, EQ2 WKF and SHK is made in this paper. The EQ3 format is a binary one, and it is taken into account for meeting the demands of the accurate location results of event epicenters when designed. Moreover, the presentation approach of multi-magnitudes' coexistence is also in accordance with international convention. The index correlation between the parameters of the focal mechanism and the basic ones of earthquakes can effectively reduce the data redundancy and build up foundation of data processing efficiently. Finally, the EQ3 implementation methods in SQL (abbreviation for Structured Query Language) Server Database are discussed in detail.

Key words: Seismic catalogue, EQ3, SQL Server Database, Implementation method