Recently, in the United States, the Open Government Initiative has been implemented. This promotes citizen participation and collaboration between government and citizens. A case of collaboration is crowdsourcing. Ushahidi and Sahana are knowned as overseas crowdsourcing service at disaster. Then Volunteer and Technical Communities (V&TCs) served these services, and the role of their communities becomes very important. At the Great East Japan Earthquake some volunteer communities served the same crowdsourcing services. However, verification of the effectiveness and problems by these services are very few. In this paper, I examine the disaster responses by overseas Open Government Collaboration. Considering the Great East Japan Earthquake, I will verify the effectiveness and problems by the crowdsourcing services and the direction of open Government in the future.
