Nikolai Maximenko and Jan Hafner SCUD Tracks the Tsunami Debris Field Nikolai Maximenko and Jan Hafner March 11, 2011 June 25, 2011 September 25, 2011 January 25, 2012 February 14, 2012 March 11, 2012 To help with the tsunami-debris search after the Great Tohoku Earthquake, Nikolai Maximenko and Jan Hafner used their Surface CUrrent Diagnostic (SCUD) Model, releasing in the model 678,305 particles along the NE coast of Japan, weighted by population density along the coast. SCUD produces high-resolution analyses of near-surface currents based on satellite data of ocean topography and surface winds. SCUD currents estimate the motions of floating objects having sufficient density to be little directly affected by surface winds. Shown is a selection of the debris-cloud maps over the first year. By June 25, the debris had moved toward Midway and the Papahānaumokuākea Marine National Monument. Then currents developed keeping the debris from Midway, as confirmed by an expedition in late November and December. The debris cloud approached Midway in February, but backed off a bit in March. Among significant confirmations was the STS Pallada report of finding a vessel verified as lost during the tsunami (red line in Sept. 25 plot shows stretch where debris was sighted, rhombus where boat was found, red circle denotes maximum debris density). Consistent with the model, no tsunami debris has been confirmed at Midway as of mid-March 2012.