VERIFICATION OF EFFECT OF COUNTERMEASURES FOR SUBSIDENCE OF HOUSES AFTER RE-LIQUEFACTION IN THE 2007 NIIGATA-KEN CHUETSU-OKI EARTHQUAKE

Abstract

The paper is focusing on the effect of countermeasures for subsidence of houses due to earthquake. Residential land of high embankment in Nagaoka New Town was suffered severe damage in the 2004 Niigata-ken Chuetsu Earthquake. Many houses were damaged by subsidence of residential land induced by soil liquefaction. Countermeasures for subsidence of houses were done after the earthquake. Reliquefaction occurred at the same areas in the 2007 Niigata-ken Chuetsu-oki Earthquake. The detailed survey for the residential land and damage to houses were conducted after the earthquake and the effects of the countermeasures were discussed.