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Array back-projection imaging of the 2007 Niigataken Chuetsu-oki earthquake striking the world's largest nuclear power plant

Ryou Honda and Shin Aoi
Array back-projection imaging of the 2007 Niigataken Chuetsu-oki earthquake striking the world's largest nuclear power plant
Bulletin of the Seismological Society of America (February 2009) 99 (1): 141-147

Abstract

The 2007 Niigataken Chuetsu-oki earthquake occurred near the Kashiwazaki-Kariwa nuclear power plant in Japan, the largest in the world. The strong motions were recorded by seven seismometers installed at the foundation slab (base-mat) of the plant and exceeded the design level of the ground motion for the plant. The strong motion observed by the seismographs in and around the plant show high coherency with three significant pulses. In order to understand the cause of these pulses, the rupture process of the earthquake was estimated using these seismograms. The seismograph network was taken into account as a dense array and semblance-enhanced waveform stacking was performed. By projecting the power of the stacked waveforms onto the fault plane, the asperities that generated significant pulses were successfully separated. The first and third pulses were generated at the hypocenter and the southwest edge of the rupture zone, respectively. The rupture propagated toward the southwest and terminated offshore from the power plant. The overall pattern of the imaged asperities coincides well with the slip distribution determined by conventional waveform inversions.


ISSN: 0037-1106
EISSN: 1943-3573
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 99
Serial Issue: 1
Title: Array back-projection imaging of the 2007 Niigataken Chuetsu-oki earthquake striking the world's largest nuclear power plant
Affiliation: Hot Springs Research Institute of Kanagawa Prefecture, Kanagawa, Japan
Pages: 141-147
Published: 200902
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 18
Accession Number: 2009-031126
Categories: SeismologyEnvironmental geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch map
Secondary Affiliation: National Research Institute for Earth Science and Disaster Prevention, JPN, Japan
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: 200917
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