scholarly journals Site Amplification Factors for Strong-Motion Sites in Japan Based on Spectral Inversion Technique and Their Use for Strong-Motion Evaluation

2007 ◽  
Vol 7 (2) ◽  
pp. 215-234 ◽  
Author(s):  
Atsushi NOZU ◽  
Takashi NAGAO ◽  
Masayuki YAMADA
Keyword(s):  
Strong Motion ◽  
Site Amplification ◽  
Amplification Factors ◽  
Spectral Inversion ◽  
Inversion Technique

scholarly journals Variation of Earthquake Ground Motions with Focus on Site Amplification Factors: A Case Study

2019 ◽  
Vol 9 (4) ◽  
pp. 4355-4360 ◽  
Author(s):  
Y. Fukushima ◽  
T. Nagao
Keyword(s):  
Hazard Analysis ◽  
Probability Distributions ◽  
Ground Motions ◽  
Strong Motion ◽  
Site Amplification ◽  
Group Delay Time ◽  
Amplification Factors ◽  
Earthquake Ground Motions ◽  
Design Earthquake

In this paper, an evaluation of the variation of earthquake ground motions with a focus on site amplification factors based on spectral analysis is presented. By using strong motion record obtained at six sites in Japan, probability distributions of site amplification factors were shown. The relations between standard deviations of site amplification factors and distances between the sites were studied. The variations of representative values of earthquake ground motions based on the variations of site amplification factors were discussed by using probabilistic seismic hazard analysis with focus on Fourier amplitude and group delay time. The distributions of peak ground accelerations and peak ground velocities were shown. It is suggested that design earthquake ground motions considering the average site amplification factors may lead the engineering design on the dangerous side.

scholarly journals Shake Map Methodology for Intermediate-Depth Vrancea (Romania) Earthquakes

2009 ◽  
Vol 25 (3) ◽  
pp. 497-514 ◽  
Author(s):  
Maren Böse ◽  
Vladimir Sokolov ◽  
Friedemann Wenzel
Keyword(s):  
Ground Motions ◽  
Strong Motion ◽  
Site Amplification ◽  
Attenuation Relations ◽  
Intermediate Depth ◽  
Amplification Factors ◽  
Strong Motion Records ◽  
Vrancea Earthquakes ◽  
Shake Map ◽  
Good Agreement

We establish and test a shake map methodology for intermediate-depth Vrancea earthquakes, based on seismological information gathered in Romania during recent years. We use region- (azimuth-) dependent attenuation relations derived from stochastic simulations of ground motions using spectral models of Vrancea earthquakes. Both region boundaries and Fourier amplification spectra for the characterization of seismic site effects are based on several hundred weak, moderate and strong-motion records and macroseismic intensity maps. We determine region-specific, magnitude- and distance-dependent amplification factors of peak values and instrumental intensity relative to rock. We interpolate recorded ground motions and ground motion estimates from the obtained amplification factors and attenuation relations for rock conditions. The resulting shake maps show a good agreement with macroseismic descriptions of moderate-sized and large Vrancea earthquakes, demonstrating the feasibility of a seismological approach to shake map generation. Unlike previous methodologies, this approach requires neither expensive assessments of geology-dependent site amplification factors, nor large numbers of strong-motion records. Our results are in good agreement with empirical topographic slope-site amplification relations, but give a better reflection of the abnormal attenuation of seismic waves in the Transylvanian region and the strong amplification in the Focsani basin.

scholarly journals S-Wave Site Amplification Factors from Observed Ground Motions in Japan: Validation of Delineated Velocity Structures and Proposal for Empirical Correction

2021 ◽  
Author(s):  
Eri Ito ◽  
Kenichi Nakano ◽  
Shigeki Senna ◽  
Hiroshi Kawase
Keyword(s):  
Transfer Functions ◽  
Strong Motion ◽  
Site Amplification ◽  
Seismic Intensity ◽  
Empirical Method ◽  
Japan Meteorological Agency ◽  
S Wave ◽  
Amplification Factors ◽  
Earthquake Research ◽  
The One

We first derived site amplification factors (SAFs) from the observed strong motions by the Japanese nationwide networks, namely, K-NET and KiK-net of National Institute of Earthquake Research and Disaster Resilience and Shindokei (Instrumental Seismic Intensity) Network of Japan Meteorological Agency by using the so-called generalized spectral inversion technique. We can use these SAFs for strong motion prediction at these observation sites, however, we need at least observed weak motion or microtremor data to quantify SAF at an arbitrary site. So we tested the capability of the current velocity models in Japan whether they can reproduce or not the observed SAFs at the nearest grid of every 250 m as the one-dimensional theoretical transfer functions (TTF). We found that at about one-half of the sites the calculated 1D TTFs show more or less acceptable fit to the observed SAFs, however, the TTFs tend to underestimate the observed SAFs in general. Therefore, we propose a simple, empirical method to fill the gap between the observed SAFs and the calculated TTFs. Validation examples show that our proposed method effectively predict better SAFs than the direct substitute of TTFs at sites without observed data.

scholarly journals Development of Digital Maps of Site Amplification Factors in Japan, and Their Applications to Early Strong Motion Estimations

2003 ◽  
Vol 56 (1) ◽  
pp. 21-37 ◽  
Author(s):  
Tomohiro KUBO ◽  
Yoshiaki HISADA ◽  
Akihiro SHIBAYAMA ◽  
Masahiro OOI ◽  
Mizuho ISHIDA ◽  
...  
Keyword(s):  
Strong Motion ◽  
Site Amplification ◽  
Amplification Factors ◽  
Digital Maps
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