| 講演要旨(和文) | | 本研究では鳥取県を中心として，中国地方や兵庫県の地震観測点を対象にサイト特性を評価した．スペクトルインバージョンによってサイト増幅特性を評価したところ，全体的に見て5Hzの増幅度が大きい傾向にあった．一方，0.5Hzの増幅度は全体的に小さいことが明らかになった．次に各観測点の地盤増幅度を評価したところ，PGVの地盤増幅度はPGAに比べて全体的に小さい傾向があり，震度増分は鳥取県西部で著しく大きな観測点が複数見られた．また，鳥取県内の近接する地震観測点のサイト増幅特性や地盤増幅度を比較したところ，観測点によってサイト増幅特性の形状や増幅度に大きな違いが見られた． |
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| | 講演要旨(英文) | | We evaluate site effects of seismic observation sites in the Chugoku region and Hyogo prefecture. Site amplification effects are estimated by spectral inversion technique, we found that amplification factors of site amplification effect of 0.5 Hz are large in the coastal areas of Tottori prefecture. Next, an evaluation of amplification factors of earthquake indices is carried out, amplification factors for PGV are smaller than those for PGA on the whole. Amplification factors for JMA seismic intensity of some observation sites in western Tottori prefecture are extremely large. Moreover, compared with site effects of nearby paired observation sites in Tottori prefecture, it shows that the shapes of site amplification effect and amplification factors of some part of paired observation sites are significantly different. |
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