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Nonlinear soil behavior observed at vertical array in the Kashiwazaki-Kariwa nuclear power plant during the 2007 Niigata-ken Chuetsu-oki earthquake

Hidenori Mogi, Santa Man Shrestha, Hideji Kawakami and Shinya Okamura
Nonlinear soil behavior observed at vertical array in the Kashiwazaki-Kariwa nuclear power plant during the 2007 Niigata-ken Chuetsu-oki earthquake
Bulletin of the Seismological Society of America (April 2010) 100 (2): 762-775

Abstract

The Kashiwazaki-Kariwa nuclear power plant suffered extreme shaking during the 2007 Niigata-ken Chuetsu-oki earthquake. Accelerograms observed at the dense seismometer array in the plant are now open to the public and will provide valuable knowledge. The temporal changes of S-wave velocity were examined by using normalized input-output minimization (NIOM) method based on the vertical array records observed during the mainshock and the events before and after it. It was found that the S-wave velocity in the layers (surface-50 m depth and 50-100 m depth) decreased significantly during the principal motion of the mainshock (indicating nonlinear behavior), whereas nearly linear behavior was observed in the bedrock layer (below 100 m depth). It was also found that the S-wave velocity increased in the layers above 100 m depth soon after this motion, indicating no major liquefaction in these layers. Finally, the relationship between the shear modulus and shear strain was examined based on the obtained S-wave velocities. The normalized shear moduli (G/G (sub 0) ) in the surface and intermediate layers decreased to about 0.2 at a strain level of 1X10 (super -3) to 1X10 (super -2) and about 0.6 at a strain level of 1X10 (super -3) to 2X10 (super -3) .


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 100
Serial Issue: 2
Title: Nonlinear soil behavior observed at vertical array in the Kashiwazaki-Kariwa nuclear power plant during the 2007 Niigata-ken Chuetsu-oki earthquake
Affiliation: Saitama University, Department of Civil and Environmental Engineering, Saitama, Japan
Pages: 762-775
Published: 201004
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 21
Accession Number: 2010-037763
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch maps
N37°15'00" - N37°45'00", E128°30'00" - E128°45'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201021
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