MANILA-The Philippine Institute of Volcanology and Seismology (Phivolcs) virtually turned over on Friday its Specific Earthquake Project Site Response Atlases to six sites Pangasinan, Tarlac, Metro Iloilo-Guimaras, Cauayan City, Butuan City, and Mati City. The atlases are compilations of maps depicting site response and resulting earthquake ground motion to help increase the seismic resiliency of infrastructures in the study areas by providing ground motion data for seismic load design considerations. According to Phivolcs, these atlases include peak ground acceleration Maps, Vs30 model maps, short-period microzonation maps, and long-period microzonation maps. Such maps provide information to collectively understand the dynamic characteristics of the underlying soil and rock layers affecting the ground motion during an earthquake. The atlases were developed under the project called "Specific Earthquake Ground Motion Levels to Help Increase the Seismic Resiliency of Government In