Study on the relationship between slow earthquakes and very large earthquakes, based on systematic data analysis

2015 Fiscal Year Final Research Report

• Project/Area Number: 23244090
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Solid earth and planetary physics
• Research Institution: The University of Tokyo
• Principal Investigator: Ide Satoshi 東京大学, 理学(系)研究科(研究院), 教授 (90292713)
• Co-Investigator(Renkei-kenkyūsha): ANDO Ryosuke 東京大学, 大学院理学系研究科, 准教授 (10455256) ; NAKATA Ryoko 独立行政法人海洋研究開発機構, 地震津波海域観測研究開発センター, 特任技術研究員 (00552499) ; HORI Takane 独立行政法人海洋研究開発機構, 地震津波海域観測研究開発センター, グループリーダー (00359176) ; SUZUKI Takehito 青山学院大学, 理工学部, 助教 (10451874)
• Project Period (FY): 2011-04-01 – 2016-03-31
• Keywords: ゆっくり地震 / 東北沖地震 / 地震活動 / 破壊すべり / 沈み込み帯 / 摩擦法則 / 潮汐応力 / 階層性不均質

Outline of Final Research Achievements

We detected deep tectonic tremors and related phenomena in many regions worldwide, and analyzed their statistical characteristics. The resultant catalog is distributed through the Internet. We confirmed that tremor and background slow slip are consistent with tectonic plate motion and discussed regional difference of statistical characteristics. Especially, the tidal response of tremors is strong and found to be useful to constrain frictional properties on the plate interface. The 2011 Tohoku-Oki earthquake was another important study target. We revealed its hierarchical rupture process and numerically modeled it based on regional historical seismicity. We also analyzed seismicity in world subduction zones and found some important relationship between seismicity parameters and regional tectonic properties.

Free Research Field

地震学