Why Buildings Collapse During Earthquakes
Earthquake building collapse occurs when ground shaking exceeds a structure’s capacity to resist lateral forces. Poor design, weak materials, and inadequate foundations increase the risk of failure.
Common Structural Failure Types
Typical failures include soft-story collapse, where open ground floors lack stiffness, and non-ductile concrete failure, where brittle columns and joints crack suddenly. Inadequate reinforcement and connections worsen damage.
Factors That Influence Collapse Risk
Building age, construction type, soil conditions, and earthquake intensity shape collapse likelihood. Older unreinforced masonry and non-engineered structures are especially vulnerable. Seismic codes and retrofitting reduce risk.
Understanding earthquake building collapse helps governments, insurers, and owners prioritize mitigation. For technical guidance on seismic design principles, see USGS Earthquake Seismic Risk.
