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Time to
have quake-proof buildings The importance of earthquake and
tsunami-resistant houses has become greater today. For seismic-prone
areas, codal instructions ask for a design suitable to meet higher
intensity of the seismic zone. All the buildings including residential
houses must be made earthquake resistant. It must be made mandatory for
a house owner to obtain the green signal from an independent structural
engineer before going ahead with the construction work. Nowadays,
architects employ engineering graduates to certify the buildings as
structurally safe. Some thumb rules, being adopted instead of evolving a
proper design, make the buildings heavy and uneconomical which is again
unsafe. This practice needs to be curbed. The government should enact
legislation in this regard. Er JAGVIR GOYAL, Chandigarh
II Since
7/10th of the earth’s surface is covered by the oceans, 70 per cent of
the earthquakes are likely to occur under the seas though all may not
give rise to killer tsunamis. The loss of life due to tsunamis caused by
undersea quakes may be much more as one may find no safe spot to run as
against an overland quake. If houses on the coast are designed to have
door openings on all sides to allow unhindered flow of tidal waves, the
damage may be much less, enhancing the chances of survival of those
perched on the rooftops. The proposal for a sea wall is not sound.
Instead, a thick vegetation belt may be more effective. Wg-Cdr C.L.
SEHGAL (retd),
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