Seismic zoning map of India is given in
- AIS 875
- BIS 456
- CIS 1893Correct
- DIS 13920
Solution
Concept
Indian Standard specifying seismic zone map
Formula
IS 1893 (Part 1) Figure 1 - Seismic Zones of India
Step-by-step solution
1. Seismic risk classification in India is divided into four zones: Zone II (Low), Zone III (Moderate), Zone IV (Severe), and Zone V (Very Severe). 2. IS 1893 (Part 1) contains the definitive national seismic zoning map and corresponding zone factor Z. 3. Other standards like IS 875, IS 456, and IS 13920 reference IS 1893 for seismic zone parameters. 4. Hence, the seismic zoning map is given in IS 1893. Answer: C
Explanation
The official Seismic Zoning Map of India, which divides the country into Seismic Zones II, III, IV, and V, is codified in IS 1893 (Part 1). It defines zone factors (Z) used to compute design lateral earthquake forces.
Why the other options are wrong
A) IS 875 provides the basic wind map of India, not the seismic map. B) IS 456 does not contain a seismic zoning map. D) IS 13920 is a detailing standard that relies on IS 1893 for seismic zoning.
Shortcut
Seismic zoning map of India is found in IS 1893.
Common mistake
Confusing IS 1893 (zoning and seismic forces) with IS 13920 (ductile detailing of RC structures).
Correct answer: C) IS 1893