2:15 PM - 2:30 PM
[HDS11-03] Importance of surface ruptures and fault damage zones in assessment of earthquake hazards
Keywords:Surface ruptures, Fault damage zones, Respect distance
Fault damage zones are now well known structures developed around faults, which are important to understand fault geometry and kinematics. Furthermore, in the point of earthquake hazard, they are very important to predict hazardous areas. Although we generally can consider respect distance to assess earthquake hazards around active faults, damages around faults or earthquake ruptures are not symmetric along the faults or ruptures. They are depending on fault type, slip sense, and location along the fault. Therefore, we should understand and consider not only respect distance but also fault damage zones and their characteristics to select proper sites for important facilities.
Several damages associated with big earthquakes show the importance of surface ruptures and fault damage zones. Although reported earthquake hazards along the surface ruptures and fault damage zones are very serious, the damages in several tens of meters away from the ruptures are generally not so serious (for strike-slip fault cases). Also, fault damage zones are important to understand locations for aftershock clustering, defining fault and earthquake segmentation, and triggering and termination of earthquakes.