Abstract
This paper proposes new seismic hazard maps and seismic macrozonation for the Philippines based on earthquake occurrence data. The completeness of two earthquake catalogues is examined and the time periods in which the data are complete are identified for each magnitude level. For the maximum use of the available data, the data of large earthquakes are taken from the long time period while the data of small earthquakes are taken from the shorter time period in which they are complete. The seismic design provisions of the Philippines are compared with those of Japan and are found to be substantially lower. To check the significance of this, the seismic hazard of Japan is also analyzed and compared with the Philippines. Based on the distribution of the 100-year return period peak ground acceleration, a new seismic zonation map of the Philippines is developed.
