深発地震を用いた東京湾岸地域の長周期地震動特性評価

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  • Evaluation of the long-period ground motion characteristics in Tokyo Bay area using the deep earthquake data
  • シンパツ ジシン オ モチイタ トウキョウ ワンガン チイキ ノ チョウ シュウキ ジシン ドウトクセイ ヒョウカ

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説明

A deep（H＝374 km）earthquake of Mj＝6.7 occurred in Kyoto-Oki region on July 16, 2007. Broad-band velocity ground motions during this event were observed at many thermal power stations in the Tokyo bay area. Waveforms observed at the stations of the east side of the Tokyo bay show longer duration than those at the west side of the bay. The apparent frequencies of later arrivals are lower than those of S-wave parts. Velocity waveforms observed in the mountain area and in the bedrock of the basin have short duration and no significant later arrivals. This suggests that the later arrivals were excited by the Kanto basin.

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