Comparison of NGA-West2 directivity models
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Abstract
Five directivity models have been developed based on data from the NGA-West2 database and based on numerical simulations of large strike-slip and reverse-slip earthquakes. All models avoid the use of normalized rupture dimension, enabling them to scale up to the largest earthquakes in a physically reasonable way. Four of the five models are explicitly “narrow-band” (in which the effect of directivity is maximum at a specific period that is a function of earthquake magnitude). Several strategies for determining the zero-level for directivity have been developed. We show comparisons of maps of the directivity amplification. This comparison suggests that the predicted geographic distributions of directivity amplification are dominated by effects of the models' assumptions, and more than one model should be used for ruptures dipping less than about 65 degrees.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Comparison of NGA-West2 directivity models |
| Series title | Earthquake Spectra |
| DOI | 10.1193/080313EQS222M |
| Volume | 30 |
| Issue | 3 |
| Year Published | 2014 |
| Language | English |
| Publisher | Earthquake Engineering Research Institute |
| Contributing office(s) | Earthquake Science Center |
| Description | 23 p. |
| First page | 1199 |
| Last page | 1221 |
| Google Analytic Metrics | Metrics page |