Geological weakness may cause buildings to collapse through movement of the strata on which the foundations are laid, for example, earthquakes and subsidence. This movement can place excessive stress on a structure, overloading it and causing collapse. Alternatively, the ground on which the building is constructed may weaken to such an extent that it is unable to support the weight of the building. Liquefaction, where the water content in the soil increases to such an extent that the soil loses all cohesiveness and strength and the building literally sinks into the ground, is the most common form of failure.
Incident commanders should be aware of the impact that weather conditions can have on collapsed structures and consider accessing Met Office systems such as Hazard Manager.
Knowledge and understanding
Understand all associated hazard knowledge