After the 2011 Great East Japan Earthquake and Tsunami disaster, Chiba prefecture (including Disney Land and Disney Sea) faced liquefaction Problems. The liquefaction means a phenomenon whereby a saturated or partially saturated soil substantially loses strength and stiffness in response to an applied stress, usually earthquake shaking or other sudden change in stress condition, causing it to behave like a liquid *. There were many houses in Chiba prefecture inclined caused by the liquefaction. The people living in the houses lost their health such as dizzy and nauseous symptoms. They also faced financial challenges to fix their houses. Niigata earthquake in 1964 is very famous for the liquefaction as you can see the below Wikipedia site.
NIED（National Research Institute for Earth Science and Disaster Prevention） developed “Ekky” to explain liquefaction for mainly school children.
http://www.bosai.go.jp/activity_general/ekky/ekky.pdf
*Wikipedia
https://en.wikipedia.org/wiki/Soil_liquefaction
