Tectonic hazards/Seismic retrofit

Seismic retrofit is the modification of a building that already exists to make it resistant to earthquake impact. Seismic retrofitting techniques can be applied to other kinds of natural disasters such as tornadoes and strong winds from thunderstorms.

Main levels of seismically retrofitted building structure performance objectives may vary, namely:
 * To protect human lives.
 * To protect a structure from total failure.
 * To preserve a structure's functionality after a strong earthquake.
 * To make a structure, practically, unaffected by any earthquake.