New BIS Seismic Zonation Map

Biggest Change

New Zone VI introduced.

Earlier: Zone II–V

Now: Zone II–VI

Highlights

• 61% land under moderate-high seismic risk
• 75% population in seismic zones
• Uses:
  • PSHA
  • PEMA

New Concept

Exposure Window

Considers:

• Population
• Infrastructure
• Socio-economic vulnerability