A study on nonlinear site response appeared on strong ground motions during the 2003 Tokachi-oki earthquake

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  • 2003年十勝沖地震の地震記録に見られる 地盤の非線形応答に関する研究
  • 2003ネン トカチオキ ジシン ノ ジシン キロク ニ ミラレル ジバン ノ ヒセンケイ オウトウ ニ カンスル ケンキュウ

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Abstract

Nonlinear site response was observed at TKCH 07 in Toyokoro and HKD 109 in Urakawa during the mainshock（Mj 8.0）and the largest aftershock（Mj 7.1）of the 2003 Tokachi-oki Earthqua ke． At TKCH 07, peak ground acceleration（PGA）was smaller than PGA at the other strong motion station in Toyokoro. At HKD 109, the accelerogram shows a characteristic spiky waveform. Due to this spiky wave, large PGA was observed compared to the other stations in Urakawa, although PGA at HKD 109 was smaller than PGA at JMA Urakawa station during the main shock and smaller aftershocks.

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