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Nonlinear Analysis on Seismic Site Response of Fuzhou Basin, China

Chen, Guoxing and Jin, Dandan and Zhu, Jiao and Shi, Jian and Li, Xiaojun (2015) Nonlinear Analysis on Seismic Site Response of Fuzhou Basin, China. Bulletin of the Seismological Society of America, 105 (2A). pp. 928-949. ISSN 0037-1106. http://resolver.caltech.edu/CaltechAUTHORS:20150501-085234176

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Abstract

Based on the parallel computing cluster platform of the ABAQUS software, a large‐scale 2D finite‐element refined nonlinear modeling approach was used to study seismic site effects in the Fuzhou basin, such as peak ground acceleration (PGA), spectral acceleration, duration, and acceleration transfer functions. A 1D equivalent linear wave propagation analysis was conducted also, with Proshake for supplementation and calibration. The simulation results demonstrated the following. (1) PGA amplification factors exhibited spatial variation characteristics that varied both laterally and with depth and exhibited a nonmonotonic decreasing characteristic with soil depth. From the 2D results, a greater motion amplification and focusing effect for some shallow soil layers was observed where there was significant fluctuation of the underlying bedrock interface. The moderate‐ and long‐period ground‐motion components were obviously amplified, but were was less pronounced in the 1D result. (2) For low‐, moderate‐, and high‐level earthquakes, the surface PGA amplification factors were 1.4–2.5, 1.3–2.0, and 1.1–2.0, respectively, and the predominant periods of the basin were 0.35–0.65 s, 0.40–0.75 s, and 0.50–1.05 s, respectively. (3) Ground‐motion durations were prolonged to different degrees, which were closely related to the characteristics of seismic bedrock motions. (4) The sensitive frequency band of the seismic site response was from 0.5 to 2 Hz. (5) Ground‐motion amplification in the downtown section of the city of Fuzhou was generally larger. To a certain extent, the 2D results reflect the influences of the surface topography relief, the fluctuation of the underlying bedrock interface, and lateral heterogeneity of soils on seismic‐wave propagation.


Item Type:Article
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URLURL TypeDescription
http://dx.doi.org/10.1785/0120140085 DOIArticle
http://www.bssaonline.org/content/105/2A/928PublisherArticle
http://bssa.geoscienceworld.org/content/105/2A/928.fullPublisherArticle
Additional Information:© 2015 Seismological Society of America. Manuscript received 30 March 2014; Published Online 3 February 2015. We thank National Program on Key Basic Research Projects of China (2011CB013601) and the National Natural Science Foundation of China (51378258) for support. This research is also based on reliable and detailed information provided by the Seismological Bureau of Fujian Province, and we are grateful for this support; the help of Huiteng Cai and Jinfu Zhang of the Seismological Bureau of Fujian Province is greatly appreciated. Thanks also go to the reviewers and editors of this article who helped us improve the work.
Funders:
Funding AgencyGrant Number
National Program on Key Basic Research Projects of China2011CB013601
National Natural Science Foundation of China51378258
Record Number:CaltechAUTHORS:20150501-085234176
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150501-085234176
Official Citation:Guoxing Chen, Dandan Jin, Jiao Zhu, Jian Shi, and Xiaojun Li Nonlinear Analysis on Seismic Site Response of Fuzhou Basin, China Bulletin of the Seismological Society of America, April 2015, v. 105, p. 928-949, First published on February 3, 2015, doi:10.1785/0120140085
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57137
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:01 May 2015 16:51
Last Modified:27 Jan 2017 15:29

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