Abstract
This paper proposes a procedure to identify the main rupture areas of heterogeneous fault models for strong-motion estimation by using the distributions of seismic moments. The heterogeneous distributions of slip amounts, average slip velocities, seismic moments, average moment rates and short-period level factors on fault planes, which were evaluated by using the data of slip vectors and their time histories during fifteen inland earthquakes and six subduction earthquakes, are studied. The main rupture area, a large-moment area having 70% of the total seismic moment, occupies about 35% of the total fault area on an average. The values of fault parameters mentioned above averaged in the main rupture area are twice as much as the ones averaged all over the fault.
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