Seismicity in the region forms diffuse clouds with several clusters. The broad distribution of seismic activity suggests that deformation is distributed over many active structures and not concentrated on a single major fault system. The elastic-wave radiation pattern of the April and May events indicate normal faulting. This localized normal faulting may be associated with the formation of pull-apart structures. The April 18 and May 3 events are the largest in the region since July 1981.