Objectives of this task are to conduct research on seismic hazards, and to provide relevant input on the expectedlevels of these hazards to other tasks. Other tasks requiring this input include those dealing with inventory, fragility curves,rehabilitation strategies and demonstration projects. The corresponding input is provided in various formats depending on theintended use: as peak ground motion parameters and/or response spectral values for a given magnitude, epicentral distance andsite conditions; or as time histories for scenario earthquakes that are selected based on the disaggregated seismic hazard mappedby the U.S. Geological Survey and are incorporated in building codes. The user community for this research is both academicresearchers and practicing engineers who may use the seismic input generated by the synthesis techniques that are developedunder this task for a variety of applications. These include ground motions for scenario earthquakes, for developing fragilitycurves and in specifying ground motion input for critical facilities (such as hospitals) located in the eastern U.S.