The Great East Japan Earthquake and tsunami on March 11, 2011 caused immense damage not only to the residents and social infrastructure,but also to cultural heritage. In order to document the endangered heritage and support cultural resource management (CRM) associated with the restoration activities, a self-motivated group of archaeologists, historians, and CRM specialists established the Consortium for Earthquake-Damaged Cultural Heritage (CEDACH). This paper reports current activities of its data management team (DMT). The team’s first task was to create a portal website and a web-based geospatial information infrastructure, the CEDACH GIS, to document the damaged and endangered heritage. We are also developing a data management system (DMS) to support local CRM inspections. Currently, we need more channels for liaising with other organisations involved in the same task for our long-term activities.