Directivity models produced for the Next Generation Attenuation West 2 (NGA-West 2) project

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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.

Additional publication details

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 Conference Paper
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