Development of strong motion prediction method of long-period pulses for the inland crustal earthquakes

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K04671
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 22020:Structure engineering and earthquake engineering-related
• Research Institution: Aichi Institute of Technology
• Principal Investigator: Kurahashi Susumu 愛知工業大学, 工学部, 准教授 (60510899)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 長周期パルス / 地震動予測 / Wenchuan earthquake

Outline of Final Research Achievements

Long-period pulses which like the observed record during the 2016 Kumamoto earthquake causes significant damage to high structures. I estimated a source model during the 2008 Wenchuan earthquake, in which long-period pulses were observed for development of strong motion prediction method of long-period pulses for the inland crustal earthquakes.
We showed that the observed long-period pulses were reproduced by the source model which were set the long-period generation area (LMGA) above seismicgenic zone. It is suggested that the relationship between the slip in LMGA and seismic moment may have moment dependence over earthquake of Mw8 class.

Free Research Field

地震工学

Academic Significance and Societal Importance of the Research Achievements

長周期パルス地震動の観測記録はまだ多くないため、まずはデータの蓄積、解析結果の蓄積が大変重要である。特にM８クラスの巨大地震ではなおさらであるため、学術的意義や社会的意義はあると考えている。また、2016年熊本地震で提案された手法が、2004年Wenchuan地震でも適用可能と示唆されたこと、Ｍ８クラスのＬＭＧＡのすべり量が規模依存となる可能性があることは、今後の長周期パルスの地震動予測には重要な成果であると考える。