1. Cabinet Office: About the damage situation related to Typhoon No. 19 in 2019, (in Japanese), http://www.bousai.go.jp/updates/r1typhoon19/pdf/r1typhoon19_45.pdf.
2. Japan Meteorological Agency (JMA): The Heavy Rain Event by Typhoon Hagibis in October 2019, https://www.jma.go.jp/jma/en/201910_Heavyrain/2019_Heavyrain.html.
3. Japan Society of Civil Engineers (JSCE), Tohoku Branch: 1978 Miyagi Prefecture Offshore Earthquake Disaster Survey Report, 1980.
4. Japan Society of Civil Engineers (JSCE) / Japanese Geotechnical Society (JGS) Joint Investigation Team Report of Northern Miyagi Prefecture Earthquake occurred July 26th in 2003, 2004.
5. Japanese Geotechnical Society (JGS) edited: Practical series 33, From investigation and examination of river embankment to maintenance, 2020, (in Japanese).