A SUPER ASPERITY MODEL FOR THE 2011 OFF THE PACIFIC COAST OF TOHOKU EARTHQUAKE

In this study, a source model composed of super asperities was newly developed for the 2011 off the Pacific coast of Tohoku, Japan, arthquake and strongground motions were simulated based on site amplification and phase characteristics. The constructed source model involved 9 super asperities, located off the coast of Miyagi through Ibaraki. The agreement between the observed and calculated ground motions was quite atisfactory, especially for the velocity waveforms (0.2-1.0 Hz) including near-source pulses. In a previous study, the authorproposed the following for the evaluation of strong ground motions resulting from a huge subduction earthquake 3)4)
:
1) Use a source model composed of relatively small subevents, which is in agreement with the time-width of observed S-wave pulses in the past earthquakes.
2) Calculate strong ground motions based on site amplification and phase characteristics. The applicability of the above strategy was fully investigated for M8 class earthquakes in a previous study4)6)
. The result of this study clearly shows the applicability of the strategy to an M9 earthquake. Future studies should be conducted to understand the physical meaning of the super asperities and to consider the scaling of super asperities with respect to the size of the entire earthquake for the prediction of strong ground motions.

作成日:
2018/04/16 
作成者(論文:筆頭著者,報告書:発行機関):
Atsushi NOZU 
フェーズ:
直後・初動期 
対象:
企業・学術機関 
カテゴリ:
地震動 
場所:
その他・非該当 
区分:
論文 
掲載誌名:
日本地震工学会論文集 
掲載巻ページ:
Vol. 14 No. 6 
出版者:
地震工学会 
災害種別:
東日本大震災 
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  • 日本地震工学会論文集
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