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A comparison of ground-motion parameters for the vertical components from the western and the southwestern parts of China with recent ground-motion prediction equations

Xing Hao and John X. Zhao
A comparison of ground-motion parameters for the vertical components from the western and the southwestern parts of China with recent ground-motion prediction equations
Bulletin of the Seismological Society of America (December 2020) 111 (2): 916-931

Abstract

This study evaluated the source, path, and site effects of the vertical ground motions from the western and the southwestern parts of China (referred to as SWC hereafter) using 2403 records from 449 earthquakes, including the records from the 2008 M (sub w) 7.9 Wenchuan earthquake and its aftershocks. Only 677 records are from 73 mainshocks, and 259 events do not have a known focal mechanism. There is a large magnitude gap in the dataset, for example, there is only one event between M (sub w) 6.3 and M (sub w) 7.8. The average numbers of records per recording station and per earthquake are small, and many sites do not have a measured shear-wave velocity profile. These shortcomings make it difficult to develop a robust groundmotion prediction equation (GMPE) without adding overseas data or using a reference GMPE developed froma large dataset.We compared the SWC datasetwith five recent GMPEs, three based on the Next Generation Attenuation-West2 dataset, one based on Europe and the Middle East, and one based on the shallow-crustal and upper-mantle earthquakes in Japan. We decomposed the total residuals for each model into constant term, between-event, and within-event residuals and calculated the corresponding standard deviations. The maximum log likelihood and the standard deviations suggest that, among the five GMPEs, the Zhao et al. (2017) model without the normal-fault term may be the most suitable GMPE for a probabilistic seismic hazard study in the SWC region. Correction functions based on simple magnitude, path, and site effect parameters were used to correct the residuals and to obtain the leftover between- and within-event standard deviations. These standard deviations appear to suggest that the GMPE from Zhao et al. (2017) without a normal-fault term may be the most suitable reference GMPE for developing a new GMPE for the SWC region.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 111
Serial Issue: 2
Title: A comparison of ground-motion parameters for the vertical components from the western and the southwestern parts of China with recent ground-motion prediction equations
Affiliation: Southwest Jiaotong University, Department of Geotechnical Engineering, Chengdu, China
Pages: 916-931
Published: 20201229
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 36
Accession Number: 2021-010144
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 12 tables
N20°00'00" - N53°00'00", E74°00'00" - E135°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute.
Update Code: 202107
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