Bloomberg has a useful explanation of the shindo system for those unfamiliar or who would like to tell their friends and family. The article notes, "At shindo 7, the JMA says, it is 'impossible to remain standing.' People may be 'thrown through the air,' wooden buildings may fall down, and even reinforced concrete walls may collapse."
http://www.bloomberg.com/news/articles/2016-04-19/-impossible-to-remain-standing-japan-s-quake-scale-explained
Tag: Understandingwhathappened
`Impossible to Remain Standing': Japan's Quake Scale
On April 15, the day after the first in a series of damaging earthquakes struck a rural part of southern Japan, all of the nation’s major newspapers carried the same headline: "Shindo 7 in Kumamoto." No further explanation was needed.