Today I seen NEWSLETTER. The south-east quarter , china country.
Earthquake nine thousand dead , school building crumble down.
The school building were stood in the land, but thick clay near cement concrete. From earthquake land break line near cement concrete ground level down crumble house building.
Do not use thick clay/stone near cement concrete ground level.
Ground level down in the land put keep SOFT clay…
In the land ground level around square down SOFT clay stand cement concrete building.
SOFT clay out side thick/stone in the land.
Do not cement near stone/thick clay in the ground land.