23rd Feb, 2016
Seismic Microzonation reports
(a) Proper assessment of Seismic Hazard
(b) Implementation of safe building construction codes, and
(c) adopting appropriate land-use planning.
Development of Concepts:
It was seen that due to an earthquake in 1985 there was severe damage in Mexico city, though the earthquake source was located about 350 km away from the city.
It was realized that putting a large region into a single seismic hazard zone is not a good idea. This and several other examples led to a new concept, called Microzonation.
Seismic microzonation is a process of identifying such related geological, seismological, hydrological and geotechnical site characteristics in a specific region.
Under the microzonation process various investigations viz, ambient noise survey, Multi-Channel Analysis of Surface Waves (MASW) survey, in-situ geotechnical testing, in-situ seismic measurements etc. were carried out and after analysis of data sets different maps viz.,
Peak Ground Acceleration (PGA), spectral accelerations for different periods, liquefaction potential, predominant frequency, amplification factor, average shear wave velocity at 30 meters depth, geology & geomorphology and projected Hazard Scenarios at GIS platform etc. have now been prepared.
Presently, New Delhi & Kolkata have been conducted tests.
Research conducted by National Centre for Seismology, Ministry of Earth Sciences. Based at Noida.
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