The primary goal of this project is to design, develop, and test methodologies for exploiting semantic aspects of the multimedia earthquake science data. The nature of data in the earthquake science domain is full of variety. That is, the interpretations of data differ from resource to resource and scientist to scientist. Therefore, our system must provide integration portability to manage the interoperability for heterogeneous data. Toward this end, we have developed an information system based on ontologies (collections of key concepts and terms along with their inter-relationships) to provide interoperability for heterogeneous data. The main capabilities of the system include modeling the meaning of the multimedia earthquake science data with mining the semantics, and providing an access to heterogeneous data sources with utilization of web services.