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A practical method to estimate strong ground motions after an earthquake, based on site amplification and phase characteristics

Y. Hata, A. Nozu and K. Ichii
A practical method to estimate strong ground motions after an earthquake, based on site amplification and phase characteristics
Bulletin of the Seismological Society of America (April 2011) 101 (2): 688-700

Abstract

After a large earthquake, it is often required to estimate strong ground motions during the earthquake at a site where an engineering structure was damaged. In this article, a new practical method of strong-motion estimation is proposed, based on aftershock records both at the site of interest and at a nearby strong-motion station and on the record of the large event at the strong-motion station. The method is simply composed of three steps. First, the Fourier amplitude at the site of interest for the large event is evaluated by correcting the Fourier amplitude at the strong-motion station for the difference of the path effect and the site amplification factors at the two sites. Then, the Fourier phase at the site of interest during the large event is approximated by the Fourier phase for a small event that occurred close to the main rupture area of the large event. Finally, an inverse Fourier transform is conducted to obtain the time history of strong ground motions at the site of interest during the large event. The method is applied to strong-motion records during the 11 August 2009 Suruga Bay, Japan, earthquake (M (sub w) 6.2) to confirm its applicability. An obvious advantage of the proposed method is its simplicity. Unlike full strong-motion simulations, it does not require fault models. Therefore, the method will contribute to a prompt estimation of strong ground motions at a site of engineering interest after a large earthquake. At the same time, unlike conventional simple techniques, the present method is focusing not only on the spectral amplitude but also on the Fourier phase. Therefore, it leads to high-quality estimation of strong ground motions.


ISSN: 0037-1106
EISSN: 1943-3573
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 101
Serial Issue: 2
Title: A practical method to estimate strong ground motions after an earthquake, based on site amplification and phase characteristics
Affiliation: Nippon Koei Company, Research and Development Center, Tsukuba, Japan
Pages: 688-700
Published: 201104
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 27
Accession Number: 2011-056676
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, geol. sketch maps
N34°30'00" - N35°34'60", E137°25'00" - E139°07'60"
Secondary Affiliation: Port and Airport Research Institute, JPN, JapanHiroshima University, 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: 201132
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