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This map shows the ground motion and shaking intensity from the March 11, 2011 earthquake at dozens of locations across Japan. Shades of pale yellow represent the lowest intensity and deep red represents high intensity. The ground shaking data is overlaid on a map of population density. A shaking intensity of VI is considered "strong" and can produce "light damage," while a IX on the scale is described as "violent" and likely to produce "heavy damage." The pattern of shaking appears to run parallel to the offshore subduction trench, with the intensity decreasing more from east to west, as opposed to north and south. Ground motion also seems to be more intense in coastal and riverine areas, where settlements are built on softer sediments and less bedrock. Note the number of VIIs and VIIIs near Tokyo, well away from the epicenter.