Causation between various earthquake precursors and an earthquake on the critical phenomena

2016 Fiscal Year Final Research Report

• Project/Area Number: 26350483
• 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: The University of Tokyo
• Principal Investigator: Uyeda Seiya 東京大学, 地震研究所, 名誉教授 (60011459)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 地震 / 臨界現象 / ナチュラル・タイム

Outline of Final Research Achievements

We investigated how to identify the onset of critical state before large earthquakes, by applying the natural time analysis method, which is useful for analysis of critical phenomena, to the time series of seismicity. For large earthquakes in Japan, we found it was possible by this method to identify the time of entry to the precursory stage, i.e. the beginning of the critical state
. The regions entering the critical state were located around the epicenters of the impending large earthquakes. In addition, we can be justified to consider that the critical state was found starting about two months before the 2011 M9.0 Tohoku earthquake, which was coincident with the appearance of other precursory phenomena.

Free Research Field

地球物理学