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Seismic zone and basic wind speed of Puducherry
Puducherry, Puducherry. Read off the published IS code zone maps by the CivilSpace Hazard Map.
SEISMIC ZONE
III
Zone factor Z = 0.16
IS 1893 (Part 1):2016, Fig. 1 and Table 3
BASIC WIND SPEED
50 m/s
Vb, the code value for this city
IS 875 (Part 3), Annex A (Amd. 2 : 2020)
Close to a seismic zone boundary. Zone II is 1.5 km away. On the published map that boundary is drawn as a line roughly 3.1 km wide on the ground, so which side a site falls on is not resolvable from the source. Confirm the zone in IS 1893 (Part 1) Fig. 1 for your exact site.
Check with the map in the IS code. Every figure here is read off the published zone maps — IS 1893 (Part 1) Fig. 1 for the seismic zone, and the basic wind speed map for Vb — whose printed boundaries are a line about 3.1 km wide on the ground. Confirm the zone against the code before you design to it.
Common questions
What is the seismic zone of Puducherry?
Puducherry is in seismic zone III on the IS 1893 (Part 1):2016 zone map, with a zone factor Z of 0.16 (IS 1893 Table 3).
What is the basic wind speed of Puducherry?
The basic wind speed Vb for Puducherry is 50 m/s, the value IS 875 (Part 3) Annex A gives for the city (as amended, Amd. 2 : 2020).