Definition: Standards issued by BIS (IS 1893, IS 4326, IS 13920) to ensure earthquake-resistant construction.
Prelims Pointers: India divided into seismic Zones II–V; BIS = Bureau of Indian Standards; Mandatory for public infrastructure.
PYQ: UPSC Prelims 2016
Current Affairs: BIS codes discussed after Turkey–Syria earthquake (2023) and Joshimath subsidence concerns.