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Characterized Source Model and Strong Ground Motion Simulation for the 2004 Mid Niigata Prefecture (Niigata-ken Chuetsu) Earthquake Based on Empirical Site Amplification and Phase Effects

坂井, 公俊 ; 野津, 厚 ; Sakai, Kimitoshi ; Nozu, Atsushi

日本地震工学会論文集, 2011, Vol.11(3), pp.40-58

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  • Título:
    Characterized Source Model and Strong Ground Motion Simulation for the 2004 Mid Niigata Prefecture (Niigata-ken Chuetsu) Earthquake Based on Empirical Site Amplification and Phase Effects
  • Autor: 坂井, 公俊 ; 野津, 厚 ; Sakai, Kimitoshi ; Nozu, Atsushi
  • Assuntos: 2004年新潟県中越地震 ; 特性化震源モデル ; 統計的グリーン関数法 ; 経験的サイト増幅・位相特性 ; The 2004 Mid Niigata Prefecture Earthquake ; Characterized Source Model ; Stochastic Green'S Function Method ; Site Specific Amplification And Phase Characteristics
  • É parte de: 日本地震工学会論文集, 2011, Vol.11(3), pp.40-58
  • Descrição: 経験的サイト増幅・位相特性を考慮した統計的グリーン関数法を用いて2004年新潟県中越地震の特性化震源モデルの構築を試みた.波形インバージョンの結果を参照し,4つのアスペリティを配置することにより,波形の良好な再現が可能となることを示した.さらに本地震での大きな特徴であるK-NET小千谷における大速度パルスの生成要因として破壊開始点付近の2つのアスペリティの重要性について確認した.また波形合成の際に経験的位相特性を用いることの妥当性について,構造物の非線形応答という観点から検討を行った.その結果,対象地点において観測された位相特性を用いることで,構造物の非線形応答の再現性が向上することを明らかにした.
    In this article, a characterized source model is proposed for the 2004 Mid Niigata Prefecture, Japan, earthquake (MJ=6.8) by using the stochastic Green's function method, taking into account the site specific amplification and phase characteristics. The strong motions are simulated based on the source model with four asperities, referring to the result of waveform inversion. The simulated ground motions are well consistent with the observed records. It is found from the simulation that the large-amplitude velocity-pulses observed at K-NET NIG019 are generated by small asperities nearby the hypocenter. Furthermore, validity of the strong motion simulation technique using site specific phase characteristics is studied. The result indicates the importance of using the site-specific phase characteristics for reliable response analyses of structures.

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