SEGJ Technical Conference

Cavity occurrence at subsurface under paved road cause by earth quake motion : a case study on the 2016 October 21 earthquake in mid-Tottori prefecture

Abstract Surface subsidences on arterial roads often raise significant social impacts. Earthquake ground motion is thought to be one of causes of subsurface cavity occurrence which may induce such surface subsidences. Authors carried out subsurface prospecting by the ground penetrating radar before and after the Mid-Tottori Earthquake occurred on 21 October 2016. The prospecting data before and after the earthquake were compared. The relationships between subsurface cavity locations and old land features or buried pipe locations were examined. The subsurface cavities seem to be prone to occur around soft grounds such as floodplaine deposits which may be susceptible to the liquefaction ,or areas where water pipes or sewer pipes were burried, having possibility of outflaw of surrounding soils.