I need to know what exactly the difference between macro and micro zonation? Also the methodology of microzonation suitable for subduction zone like Nepal?
Dynamic characteristics of site such as predominant period, amplification factor, shear wave velocity, standard penetration test values can be used for seismic microzonation purpose. Shear wave velocity measurement and standard penetration test are generally expensive and are not feasible to be carried out at large number of sites for the purpose of microzonation. Ambient Vibrations measurement (also called Microtremor) has become a popular method for determining the dynamic properties of soil strata and is being extensively used for microzonation. Microtremor observations are easy to perform, inexpensive and can be applied to places with low seismicity as well, hence, microtremor measurements can be used conveniently for microzonation.
Seismic microzonation is defined as the process of subdividing a potential seismic or earthquake prone area into zones with respect to some geological and geophysical characteristics of the sites such as ground shaking, liquefaction susceptibility, landslide and rock fall hazard