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According to the requirements of spatial visualization software applied to the research on seismic activity, a platform based on Web services is developed and its architecture is introduced. Geoserver is used at the server end and OpenLayers at the client end to achieve the integration of WebGIS and Web service. The system supports analysis at both spatial and temporal dimensions for earthquakes. It supports many functions as following: ① Spatial visualization for various geographic elements such as earthquakes, faults, political districts and etc.; ② 3D simulation of faults with WebGL is supported by the system; ③ Popular time-series-oriented methods for seismic activity; ④ Interfaces for configuring, controlling, selecting, and measuring of geographic layers; ⑤ Interfaces for interactive querying.