Seismic microzonation: A review of principles and practice

The first part of the paper presents an overview of miscellaneous methodologies for seismic-geotechnical hazard zonation that conform to the recommendations of ISSMGE (1999). The purpose of this review is to illustrate the variety of methodologies currently in use for preparation of seismic hazard maps, as well as to evaluate basic principles of zonation for different purposes and in different scales. In the second part of the paper, input data for seismic microzonation are discussed. Promulgated seismic regulations are a prerequisite for delineation of seismic hazard zones. Guidelines and recommendations for seismic microzonation should be incorporated in seismic regulations. There are two principal approaches to earhquake loss mitigation ; the first one is related to land use management ; the second one deals with the design and construction of individual buildings. Both approaches must be taken into consideration as a part of urban planning and building design, and their application and use should be required and enforced by municipal authorities.