What happens during earthquake?
In an Earthquake,
-Seismic Waves arise from sudden movements in a rupture zone in the earth's crust.
-Waves of different types and velocities travel different paths before reaching a building's site.
What happens to the buildings?
During earthquake, ground moves rapidly back and forth, which result in foundation movement of foundations.While upper part of the building prefer to remain where it is because of its mass of inertia.
This result in strong vibrations of the structure with resonance phenomena between the structure and the ground, and thus result in large internal forces. This results in plastic deformation of the structure and substantial damage with local failures and , in extreme cases, collapse..