Improvement of strong ground motion prediction of Nankai Trough subduction-zone earthquake considering 2011 Tohoku earthquake

2015 Fiscal Year Final Research Report

• Project/Area Number: 25350497
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Natural disaster / Disaster prevention science
• Research Institution: Osaka University (2015); Kyoto University (2013-2014)
• Principal Investigator: Kawabe Hidenori 大阪大学, 工学(系)研究科(研究院), 准教授 (00346066)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 海溝型地震 / 強震動予測 / 南海地震 / 長周期地震動 / 差分法 / 強震動生成領域

Outline of Final Research Achievements

To predict the strong ground motion of subduction-zone earthquake in the Nankai Trough, we try to evaluate the effect of submarine topography, sea water, and the land area topography on the ground motion. As a result, the effect of shallow sea water as the Osaka Bay, on the ground motion was very small. But, the effect of deep sea water was not so little. Comparing the calculation result with considering sea water and without considering sea water, the amplitude of the waveform changed 10% to 20%.
Then, as a result of evaluation of the influence of the source rupture process on the predicted ground motion, the positional relationship between the shape and rupture starting point of the strong motion generation area has been found to provide a very large impact on the local ground motion.

Free Research Field

地震工学