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1990-1999 period as the International Decade for Natural Disaster Reduction (UN/IDNDR; UN Res. 42/169/
1987). Among the IDNDR Demonstration Projects is the Global Seismic Hazard Assessment Program (GSHAP),
launched in 1992 by the International Lithosphere Program (ILP) and implemented in the 1992-1999 period. In
order to mitigate the risk associated to the recurrence of earthquakes, the GSHAP promoted a regionally
coordinated, homogeneous approach to seismic hazard evaluation. To achieve a global dimension, the GSHAP
established initially a mosaic of regions and multinational test areas, then expanded to cover whole continents
and finally the globe. The GSHAP Global Map of Seismic Hazard integrates the results obtained in the regional
areas and depicts Peak-Ground-Acceleration (PGA) with 10% chance of exceedance in 50 years, corresponding
to a return period of 475 years. All regional results and the Global Map of Seismic Hazard are published in 1999
and available on the GSHAP homepage on http://seismo.ethz.ch/GSHAP/.
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