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Abstract
Five new directivity models are being developed for the NGA-West 2 project. All are based on the NGA-West 2 data base, which is considerably expanded from the original NGA-West data base, containing about 3,000 more records from earthquakes having finite-fault rupture models. All of the new directivity models have parameters based on fault dimension in km, not normalized fault dimension. This feature removes a peculiarity of previous models which made them inappropriate for modeling large magnitude events on long strike-slip faults. Two models are explicitly, and one is implicitly, 'narrowband' models, in which the effect of directivity does not monotonically increase with spectral period but instead peaks at a specific period that is a function of earthquake magnitude. These narrowband models' functional forms are capable of simulating directivity over a wider range of earthquake magnitude than previous models. The functional forms of the five models are presented.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Directivity models produced for the Next Generation Attenuation West 2 (NGA-West 2) project |
| Year Published | 2012 |
| Language | English |
| Publisher | International Association for Earthquake Engineering |
| Contributing office(s) | Earthquake Science Center |
| Description | 9 p. |
| Larger Work Type | Book |
| Larger Work Subtype | Conference publication |
| Larger Work Title | Proceedings of the 15th World Conference on Earthquake Engineering, Portugal, 2012 |
| Conference Title | 15th World Conference on Earthquake Engineering |
| Conference Location | Lisbon, Portugal |
| Conference Date | September 24-28, 2012 |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |