New predictive equations for Arias intensity from crustal earthquakes in New Zealand |
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| Authors: | Peter J Stafford John B Berrill Jarg R Pettinga |
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| Institution: | (1) Department of Civil and Environmental Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK;(2) Department of Civil Engineering, University of Canterbury, Private Bag 4800, Christchurch, New Zealand;(3) Department of Geological Sciences, University of Canterbury, Private Bag 4800, Christchurch, New Zealand |
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| Abstract: | Arias Intensity (Arias, MIT Press, Cambridge MA, pp 438–483, 1970) is an important measure of the strength of a ground motion,
as it is able to simultaneously reflect multiple characteristics of the motion in question. Recently, the effectiveness of
Arias Intensity as a predictor of the likelihood of damage to short-period structures has been demonstrated, reinforcing the
utility of Arias Intensity for use in both structural and geotechnical applications. In light of this utility, Arias Intensity
has begun to be considered as a ground-motion measure suitable for use in probabilistic seismic hazard analysis (PSHA) and
earthquake loss estimation. It is therefore timely to develop predictive equations for this ground-motion measure. In this
study, a suite of four predictive equations, each using a different functional form, is derived for the prediction of Arias
Intensity from crustal earthquakes in New Zealand. The provision of a suite of models is included to allow for epistemic uncertainty
to be considered within a PSHA framework. Coefficients are presented for four different horizontal-component definitions for
each of the four models. The ground-motion dataset for which the equations are derived include records from New Zealand crustal
earthquakes as well as near-field records from worldwide crustal earthquakes. The predictive equations may be used to estimate
Arias Intensity for moment magnitudes between 5.1 and 7.5 and for distances (both rjb and rrup) up to 300 km. |
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| Keywords: | Arias intensity New Zealand Crustal Earthquakes Ground-motion prediction Attenuation |
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