Systematic ground motion observations in the Canterbury earthquakes and region-specific non-ergodic empirical ground motion modeling

Type of content
Journal Article
Publisher's DOI/URI
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Publisher
University of Canterbury. Civil and Natural Resources Engineering
Journal Title
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Date
2015
Authors
Bradley, Brendon
Abstract

This paper presents an examination of ground motion observations from 20 near-source strong motion stations during the most significant 10 events in the 2010-2011 Canterbury earthquake to examine region-specific systematic effects based on relaxing the conventional ergodic assumption. On the basis of similar site-to-site residuals, surfical geology, and geographical proximity, 15 of the 20 stations are grouped into four sub-regions: the Central Business District; and Western, Eastern, and Northern suburbs. Mean site-to-site residuals for these sub-regions then allows for the possibility of non-ergodic ground motion prediction over these sub-regions of Canterbury, rather than only at strong motion station locations. The ratio of the total non-ergodic vs. ergodic standard deviation is found to be, on average, consistent with previous studies, however it is emphasized that on a site-by-site basis the non-ergodic standard deviation can easily vary by ±20%.

Description
Citation
Bradley BA (2015) Systematic ground motion observations in the Canterbury earthquakes and region-specific non-ergodic empirical ground motion modeling. Earthquake Spectra, 31(3), pp. 1735-1761.
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Ngā upoko tukutuku/Māori subject headings
ANZSRC fields of research
Fields of Research::37 - Earth sciences::3706 - Geophysics::370609 - Seismology and seismic exploration
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