United States Department of Transportation
i
Incorporation of forward-directivity into seismic hazard analysis.
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2009-01-01
[PDF-734.20 KB]
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Edition:Final research report.
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Abstract:Ground motions in close proximity to the causative fault of an earthquake can be significantly affected by the propagation of
rupture. In particular, when the rupture and slip direction relative to a site coincide and a significant portion of the fault ruptures
towards the site, the ground motion can exhibit the effects of Forward-Directivity (FD). Forward-directivity effects can result in
higher seismic demands and must be considered for design or retrofit of a structure that is in the proximity of an active fault. Much
research has been conducted recently on the seismological aspects leading to forward-directivity, the characteristics of FD motions.
However, designers still lack specific guidelines as to how to account for FD effects when determining the seismic hazard for a given
structure.
The overall purpose of this research project is to develop a methodology for the inclusion of the effects of near-fault forwarddirectivity
into the determination of seismic demand for a structure or a geotechnical system. The focus of the study will be the
potential for near-fault effects associated with the Seattle and Tacoma faults in Washington State, and how these near-fault effects can
affect the transportation infrastructure in the state.
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