FactSheet: FS2018-E-0003

Title:
Large ground deformations caused by the 2018 Hokkaido Eastern Iburi Earthquake

Authour:
Kazuo KONAGAI¹, Seiji NISHIYAMA², Kanta OHISHI³, Daiki KODAMA⁴, Yuki NANNO⁵

¹Fellow of JSCE, Professor Emeritus, University of Tokyo, Japan
²Member of JSCE, Head, Urban Infra & Engineering Division, Nikken Sekkei Civil Engineering Ltd., Japan
³Member of JSCE, Urban Infra & Engineering Division, Nikken Sekkei Civil Engineering Ltd., Japan
⁴Urban Infra & Engineering Division, Nikken Sekkei Civil Engineering Ltd., Japan
⁵Urban Infra & Engineering Division, Nikken Sekkei Civil Engineering Ltd., Japan,

Key Facts:
・Hazard Type: Earthquake
・Date of disaster: Sept. 6th , 2018
・Location of Survey: Iburi and Sapporo, Hokkaido, Japan
・Date of the field survey: Oct. 9th to 10th, 2018
・Survey tools: GPS receivers and a laser ranger

Key findings:
1)Morphological features of a landslide mass north of Atsuma Town suggested that the activatedfrictional coefficient beneath this landslide mass was only 0.054 as much.
2)Locations of the widespread liquefaction in residential areas of Sapporo’s Kiyota Ward werefound almost exclusively along old streams that ever existed there.

Key Words:Hokkaido Eastern Iburi Earthquake, volcanic ash and pumice, landslides, liquefaction

Paper: PDF 3,587KB