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Arias intensity conditional scaling ground-motion models for subduction zones

Jorge Macedo, Norman A. Abrahamson and Jonathan D. Bray
Arias intensity conditional scaling ground-motion models for subduction zones
Bulletin of the Seismological Society of America (June 2019) 109 (4): 1343-1357

Abstract

Conditional ground-motion models (CGMMs) for estimating Arias intensity (I (sub A) ) for earthquakes in subduction zones are developed. The estimate of I (sub A) is conditioned in these models on the estimated peak ground acceleration (PGA), the spectral acceleration at T=1 s (SA1), time-averaged shear-wave velocity in the top 30 m (V (sub S30) ), and magnitude (M (sub w) ). Random-effects regressions are used to develop CGMMs for Japan, Taiwan, South America, and New Zealand. By combining the conditional models of I (sub A) with the ground-motion models (GMMs) for PGA and SA1, the conditional models are converted to scenario-based GMMs that can be used to estimate the median I (sub A) and its standard deviation directly for a given earthquake scenario and site conditions. The conditional scaling approach ensures the estimated I (sub A) values are consistent with a design spectrum that may correspond to above-average spectral values for the controlling scenario. In addition, this approach captures the complex ground-motion scaling effects found in GMMs for spectral acceleration, such as sediment-depth effects, soil nonlinearity effects, and regionalization effects, in the developed scenario-based models for I (sub A) . Estimates from the new scenario-based I (sub A) models are compared to those from traditional GMMs for I (sub A) in subduction zones.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 109
Serial Issue: 4
Title: Arias intensity conditional scaling ground-motion models for subduction zones
Affiliation: Georgia Institute of Technology, School of Civil and Environmental Engienering, Atlanta, GA, United States
Pages: 1343-1357
Published: 20190618
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 33
Accession Number: 2019-062127
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
S47°30'00" - S34°30'00", E166°30'00" - E178°30'00"
S55°00'00" - N13°00'00", W82°00'00" - W35°00'00"
N22°00'00" - N25°30'00", E119°15'00" - E122°00'00"
N30°00'00" - N45°00'00", E129°00'00" - E147°00'00"
Secondary Affiliation: University of California at Berkeley, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201932
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