Visualization and collaboration of large scale data sets on Internet is still one of biggest challenges in scientific visualization. A distributed, real-time, collaborative system for large scale data like seismic model can be a valuable tool to support scientific research. In this paper, we present a new approach for web-based synchronized collaborative visualization of large scale data using web services and rich web clients which supports collaborative visualization in web browsers. We use WS-Resources in WSRF (Web Services Resource Framework) to maintain states collaborative server. On client side, we design an Ajax-based (Asynchronous JavaScript and XML) application using standard web technologies. A collaborative demonstration of 3D seismic model which is 2GB size is presented and experimental results are showed finally.