Abstract
This paper investigates the influence of earthquake locations and an accretionary wedge in the Nankai Trough area on long-period ground motions in Tokyo using the 3D finite difference method. There is not much difference in ground motions in Tokyo when earthquake sources in the Japan Trench and the Nankai Trough are hypothetically assumed to be in the same conditions (e.g. moment, depth). Considering accretionary wedge in the Nankai Trough area, response is larger above accretionary wedge and smaller in Tokyo. It's suggested that the accretionary wedge is easy to trap seismic waves and doesn't necessarily enlarge response in distant Tokyo.
