Is there any sign of building collapse?
Omen of building collapse
Omen 1: the ground suddenly subsides, hollows or cracks suddenly increase.
Omen 2: serious cracks appear in load-bearing columns, beams, slabs or walls and continue to develop.
Omen 3: excessive deformation of bearing column, beam, slab or wall, serious decay of wood members or connection parts or being eaten by mosquitoes.
Omen four: the wall or the ceiling of the swing layer suddenly large area spalling, falling off.
Omen 5: the house suddenly makes abnormal sound, such as "crackle", "chirp", burst