Search Results 1-20 of 182

  • BROADBAND SOURCE MODEL AND STRONG MOTIONS OF THE 2018 HOKKAIDO EASTERN IBURI EARTHQUAKE  [in Japanese]

    SATOH Toshimi

    … We examined the causes of large ground motions to improve strong motion predictions for feature crustal earthquakes.</p><p>  Firstly, we separated the source, path and site effects on strong motions by the spectral inversion using the main shock and aftershock records. … Empirical amplification factors for weak motions in frequencies 5-10 Hz are largest at IBUH01 among 33 stations. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (763), 1175-1185, 2019-09

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  • PROPOSAL OF SPATIAL PROBABILISTIC SEISMIC HAZARD ANALYSIS AND THE APPLICATION TO THE DISASTER PREVENTION  [in Japanese]

    HAYASHI Takayuki , YASHIRO Harumi

    … Ground motion intensity measures in the dataset is peak ground velocity on engineering bedrock which are based on the records observed in Kanagawa prefecture for the target site in this study. … We calculate the residuals between actual and estimated ground motion of dataset and obtain the relationship between the correlation factors of residuals and the distances for pairs of observation stations. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (762), 1043-1053, 2019-08

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

    Fukushima Yasuhiro , Nagao Takashi

    … 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. …

    Engineering Technology & Applied Science Research 9(4), 4355-4360, 2019-08

    IR 

  • OPTIMIZATION OF EFFECTIVE STRAIN COEFFICIENT FOR NONLINEAR SITE RESPONSE ESTIMATION BY EQUIVALENT-LINEAR SIMULATION  [in Japanese]

    SATO Hiroaki , HIGASHI Sadanori , SHIBA Yoshiaki , FUJIWARA Hiroyuki , KUNUGI Takashi

    … Based on new field investigation data, an applicability of three types of equivalent-linear simulations for nonlinear site response estimation was examined by using three ground motion records with more than 500 Gal. … As a result, it was found that the observed site responses were relatively well explained by the equivalent-linear simulation with frequency-dependent effective strain for damping factors. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (760), 781-791, 2019-06

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  • LONG-PERIOD AND LONG-DURATION GROUND MOTION PREDICTION EQUATIONS FOR EARTHQUAKES ALONG THE SAGAMI TROUGH BASED ON STRONG MOTION RECORDS  [in Japanese]

    SATOH Toshimi , NAKAGAWA Hiroto , KOYAMA Shin , SATO Toshiaki , TOHDO Masanobu

    … The amplification factors for SA tend to be smaller than those for earthquakes along the Nankai Trough obtained by our previous paper. … This tendency reflects feature of surface waves.</p><p> 5) Site coefficients of S<sub>A</sub> …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (758), 501-511, 2019-04

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  • ESTIMATION OF INHOMOGENEOUS ATTENUATION STRUCTURE, SOURCE PARAMETERS AND SITE AMPLIFICATION BY DIVIDING THE PATH REGION FROM THE SOURCE TO SITES:Application to the source region of the 2008 Iwate-Miyagi Nairiku Earthquake  [in Japanese]

    TOMOZAWA Yusuke , KATO Kenichi , NOJIRI Kiichiro

    … br> 2) Compared with the conventional method which assume homogeneous attenuation structure, site amplification factors were estimated to be large at the site where volcanos are in the vicinity such as the IWTH25, and the short-period level of source spectra was estimated to be small.<br> 3) Interpretation of small source spectra and large site amplification factors is as …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (756), 171-181, 2019-02

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  • A Study on an Empirical Formula for Amplification Factor Based on Fundamental Peak Frequency and Amplitude of Microtremor H/V  [in Japanese]

    NISHIKAWA Hayato , NOGUCHI Tatsuya , MIYAJIMA Masakatsu , KAGAWA Takao

    <p>本研究では微動H/Vにより簡便かつ精度良く最大地動速度の地盤増幅度を評価することを目的として,基盤への入射スペクトルの特性を考慮した経験的な地盤増幅度評価式を求めた.まず,著者らの提案した理論地盤増幅度評価式をもとにサイト増幅特性の1次ピーク振動数と振幅をパラメータとする経験式を導き,地盤増幅度を精度良く評価できることを示した.続いて,地震観測記録から評価した地盤増幅度を対象にサ …

    Journal of Japan Association for Earthquake Engineering 19(7), 7_41-7_55, 2019

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  • Examination of method to detect silent allele on D19S433 locus  [in Japanese]

    Kutsuwada Yukinobu

    … The cause of this problematical mismatch is reported that the mutation is a base change (G>A) 32 nucleotides downstream from the 3′ end of the AAGG repeats (G32A), so reverse primer in STR kits fail to anneal to the binding site, consequently no STR peak or extremely low peak is detected. …

    Japanese Journal of Forensic Science and Technology, 2019

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  • STOCHASTIC CHARACTERISTIC OF SITE AMPLIFICATION FACTOR AND ITS EFFECT ON EARTHQUAKE GROUND MOTION  [in Japanese]

    FUKUSHIMA Yasuhiro , NAGAO Takashi

    <p> 地震動を決定する要素の一つであるサイト増幅特性のばらつきに着目した地震動のばらつきの評価を行った.対象地点での地震観測記録のフーリエスペクトルを,対象地点と同時記録が得られている近隣強震観測点(基準点)での地震観測記録のフーリエスペクトルで除した比を基準点における経験的サイト増幅特性に乗じることにより,対象地点のサイト増幅特性を多数の地震について評価し,そのばらつきを算定した. …

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 75(4), I_763-I_769, 2019

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  • Estimation of Source, Path and Site Effects of the 2018 Hokkaido Eastern Iburi Earthquake  [in Japanese]

    TOMOZAWA Yusuke , KATO Kenichi , NOJIRI Kiichiro

    <p>平成30年北海道胆振東部地震を含む北海道西部で発生した強震観測記録を収集し,震源特性,伝播経路特性,サイト増幅特性をスペクトルインバージョン解析により推定した.本震の短周期レベルは壇ほか (2001) による経験式の2倍程度と推定された.余震も含む応力降下量には震源深さ依存性が見られた.震源域周辺の伝播経路の<i>Q</i>値は<i>Q< …

    Journal of Japan Association for Earthquake Engineering 19(4), 4_170-4_174, 2019

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  • Ground Motions of the 2018 Northern Osaka Earthquake Based on Spectral Inversion and Ground Motion Prediction Equations  [in Japanese]

    SATOH Toshimi

    … <p>We examine the source, path and site effects to strong ground motions during the 2018 northern Osaka earthquake (<i>M</i><sub>J</sub>6.1, <i>M</i><sub>w</sub> … The site amplification factors from the seismic bedrock for PGV and Fourier spectra at periods of 1 to 2 s are large in the northeast and southwest directions from the source. …

    Zisin (Journal of the Seismological Society of Japan. 2nd ser.) 71(0), 201-218, 2019

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  • Evaluation of ground vibration characteristics by using microtremor array survey in Kuji City, Iwate Prefecture  [in Japanese]

    Yamamoto Hidekazu , Ishikawa Takuya , Saito Tsuyoshi

    <p>岩手県久慈市の海岸平野部において極小微動アレイ観測を実施し,微動のH/Vおよび位相速度を用いて,地下地盤浅部S波速度構造の推定を試みた。地震動増幅特性を評価するために,30m平均S波速度を用いて工学的基盤からの最大速度地盤増幅率を算出し,S波速度構造モデルを用いてSH波の周波数毎の増幅率を算出した。その結果を以下に示す。地下構造モデルを推定した結果,表層S波速度が約100m/sと …

    BUTSURI-TANSA(Geophysical Exploration) 72(0), 8-16, 2019

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  • EVALUATION OF AMPLITUDE DEPENDENCY OF SITE AMPLIFICATION FACTORS BASED ON STRONG MOTION RECORDS  [in Japanese]

    堀 愛里香 , 翠川 三郎

    日本建築学会構造系論文集 (752), 1517-1523, 2018-10

    AIJ 

  • Vertical Distribution of Total Mercury and Mercury Methylation in a Landfill Site in Japan

    Yang Jing , Takaoka Masaki , Sano Akira , Matsuyama Akito , Yanase Ryuji

    … While landfill sites can be a source of mercury pollution, the behavior of mercury in solid waste within a landfill site is still not fully understood. … The purpose of this study was to determine the depth profile of mercury, the levels of methyl mercury (MeHg), and the factors controlling methylation in an old landfill site that received waste for over 30 years. …

    International Journal of Environmental Research and Public Health 15(6), 2018-06

    IR 

  • Seismic Intensity Distribution of Meiji 22 Kumamoto Earthquake  [in Japanese]

    YAMANAKA Yoshiko , NIIDA Noriko

    … The obtained seismic-intensity map was compared with the site amplification factor data provided by the National Research Institute for Earth Science and Disaster Resilience (NIED). … It seems that the regions with large site amplification factors tend to experience high seismic intensities. … The houses of the Meiji period were generally located on relatively strong ground with a small amplification factor. …

    Zisin (Journal of the Seismological Society of Japan. 2nd ser.) 70(0), 233-248, 2018

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  • Evaluation of Site Amplification Factors at Damage sites for the 2016 Kumamoto Earthquake based on Spectral Inversion Method using the Observed Aftershock Records  [in Japanese]

    秦 吉弥 , 門田 浩一 , 矢部 正明 , 池田 隆明

    地盤工学会誌 = Geotechnical engineering magazine : 土と基礎 65(10), 18-21, 2017-10

  • EVALUATION OF STRONG GROUND MOTION IN KUMAMOTO CASTLE DURING THE 2016 KUMAMOTO EARTHQUAKE SEQUENCE FOCUSED ON DIFFERENCE OF SITE AMPLIFICATION FACTORS  [in Japanese]

    HATA Yoshiya , MURATA Akira , IKEMOTO Toshikazu , HASHIMOTO Takao , MIYAJIMA Masakatsu

    2016年熊本地震の地震動の作用により,熊本城内では,石垣の崩壊や櫓の損壊などの甚大な被害が数多く発生した.本稿では,2016年熊本地震の前震時ならびに本震時に,熊本城内に作用した地震動を推定した結果について報告する.具体的には,まず,熊本城内および周辺の強震観測点において常時微動計測を実施し,得られた記録に基づいてサイト増幅特性を評価した.次に,熊本城周辺で観測された前震記録・本震記録をサイト増 …

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 73(4), I_787-I_795, 2017

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  • A SIMPLE ESTIMATION METHOD OF SITE AMPLIFICATION FACTOR AT CENTRAL AND WESTERN DISTRICT OF JAPAN BY USE OF KRIGING METHOD  [in Japanese]

    NAGAO Takashi , FUKUTA Ken , ITO Yoshihiro

    深層地盤構造による増幅特性は一般に一次元構造を仮定した増幅特性と比較して大きな振幅を示す.このため,解析的にサイト増幅特性を精度良く評価することは困難を伴うことが多く,強震記録の解析により評価される.一方で,耐震設計や地震防災の観点からはサイト増幅特性を任意の地点で簡易に評価することが求められる.本研究では,一次元の深層地盤構造を仮定した周波数伝達関数を補正することでサイト増幅特性を安全側に評価す …

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 73(4), I_148-I_160, 2017

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  • A STUDY ON THE CORRELATION BETWEEN GROUND VIBRATION CHARACTERISTIC AND DAMAGE LEVEL OF STRUCTURES AT MASHIKI TOWN BY THE 2016 KUMAMOTO EARTHQUAKE  [in Japanese]

    NAGAO Takashi , LOHANI Tara Nidhi , FUKUSHIMA Yasuhiro , ITO Yoshihiro , HOKUGO Akihiko , OSHIGE Junpei

    2016年熊本地震は各地に大きな被害をもたらしたが,特に熊本県益城町においては甚大な住宅被害が生じた.現地における特に甚大な住宅被害は県道28号と秋津川の間に挟まれたエリアに局在しており,局所的な地盤条件によって住宅被害の甚大なスポットが生じたことが示唆された.本研究では,住宅被害の激しかったエリアを中心に常時微動観測を実施し,地盤条件と住宅被害の相関について考察した.常時微動観測は単点観測とアレ …

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 73(4), I_294-I_309, 2017

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  • Analysis of the Factors of Large Acceleration Amplitude and Estimation of the Bedrock Ground Motions at the KiK-net Mashiki Station Caused by the Largest Foreshock (Mj6.5) of the 2016 Kumamoto Earthquake  [in Japanese]

    KOBAYASHI Genyuu , MAMADA Yutaka , WU Changjiang

    <p>2016年熊本地震の最大前震 (気象庁マグニチュード (Mj) 6.5) により1Gを超える大加速度を記録した基盤強震観測網 (KiK-net) 益城観測点における強震動の要因解明に資するため,鉛直アレー観測記録を用いた地盤同定解析及び一次元波動伝播解析に基づき強震記録を詳細に分析した.あわせて,強震記録のはぎ取り解析に基づき最大前震の地震基盤相当 (S波速度2700m/s) に …

    Journal of Japan Association for Earthquake Engineering 17(4), 4_101-4_139, 2017

    J-STAGE 

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