In response to the 8.9 magnitude earthquake, which struck offshore Sendai, Japan on Mar 11th 2011, the Center for Geographic Analysis at Harvard University has launched the Japan Sendai Earthquake Data Portal (http://cegrp.cga.harvard.edu/japan/) to support the exchange of geospatial datasets for relief and reconstruction efforts. The UN-SPIDER Knowledge Portal is an official source of information for agencies and personnel taking part in the relief effort at http://www.un-spider.org/japan-pacific. There is also an OpenStreetMap humanitarian effort that includes DigitalGlobe post-disaster imagery at http://wiki.openstreetmap.org/wiki/2011_Sendai_earthquake_and_tsunami.
