Analysis of Damage to Residential Embankments in the Omagari Namiki Area of Kitahiroshima City by the 2018 Hokkaido Eastern Iburi Earthquake and Verification of the Effectiveness of Countermeasures Using Groundwater Level Lowering Methods

Abstract

In the 2018 Hokkaido Eastern Iburi Earthquake, 28 residential lots facing the Omagari River collapsed in the Omagari Namiki 3-chome district of Kitahiroshima City. The main damaged residential area was located in a corner of a long and narrow town block facing the right bank (east side) of the Omagari River. In this paper, we analyzed the collapsed embankment damage in the Omagari Namiki 3-chome district of Kitahiroshima City, and verified the effectiveness of the countermeasure against sliding collapse using the groundwater level lowering method.