日本地球惑星科学連合2019年大会

講演情報

[J] ポスター発表

セッション記号 S (固体地球科学) » S-SS 地震学

[S-SS13] 強震動・地震災害

2019年5月27日(月) 17:15 〜 18:30 ポスター会場 (幕張メッセ国際展示場 8ホール)

コンビーナ:栗山 雅之(一般財団法人 電力中央研究所 地球工学研究所 地震工学領域)、染井 一寛(一般財団法人地域地盤環境研究所)

[SSS13-P37] Nonlinear Ground Motion Response During the 2016 Meinong Taiwan Earthquake

*Kuo-Liang Wen1Chun-Te Chen2 (1.National Central University, Department of Earth Sciences、2.Academia Sinica, Institute of Earth Sciences)

キーワード:Meinong earthquake, nonlinear site response, HVSR

The Meinong Taiwan earthquake occurred on February 6, 2016, at 03:57 (UTC+8) with ML 6.6. The strong ground motion induced the soil liquefaction in Sinshih and Annan districts. To investigate the nonlinear site response during Meinong mainshock, the degree of nonlinear site response (DNL) which summation of the horizontal to vertical spectral ratios (HVSR) differences between weak-motions and Meinong mainshock records from the Taiwan Strong Motion Instrumentation Program (TSMIP) network are calculated. We compare the DNL values with the ground motion parameters such as peak ground acceleration (PGA), peak ground velocity (PGV), and also the ratio between PGV and Vs30. The DNL shows a positive correlation with ground motion intensity, particular with PGV, and the surface site conditions also leading the DNL strength. We also applied a stochastic method for modeling the ground motion of the Meinong earthquake with site correction by the HVSR of weak and strong motions respectively. The percentage of PGA reduction calculated in this study can be an indicator of the spatial distribution of the degree of nonlinear soil effects of the 2016 Meinong Taiwan earthquake.