Task 2: Directionality

Direction (azimuth) and relative amplitudes of the maximum and minimum horizontal ground motions at a site located close to an active fault are important in determining the damage and loss to an existing structure. For example, at sites very close to active faults, the fault-normal direction can experience significantly larger intermediate- and long-period ground motions than the fault-parallel direction. This task will examine directionality effects and add these effects to the NGA West models. This will allow the NGA-West 2 models to accurately account for important factors such as fault mechanism, source-site azimuth, magnitude, and distance on these directionality effects.