My mother lived in an apartment building, which probably had around five floors. Chinese buildings are usually made of solid concrete to make them stable and strong, but also very heavy. If the building collapses, hiding under a table is no use. The building will squash it flat.
My grandmother therefore had to do like all the other families who were living in apartments: go and live in the field. Hundreds of families lived in the big exercising field. My grandmother retrieved a large cloth and a few poles and made a tent.