and fault lines , there is still no definite way to predict when these violent seismic events will occur.
We now have, as of Phivolcs record, a total of 111 facilities in the agency’s seismic network, including 75 satellite-telemetered seismic stations, 29 staff-controlled seismic stations, and seven volcano observatories. Government and private buildings are required to install a certain number of ERI in Seismic Zone 4 in the entire Philippines, except Palawan and Tawi-Tawi which are in Zone 2. It now forms part of the requirements for the Annual Certificate of Inspections for existing buildings and as a pre-condition for the issuance of Certificate of Occupancy for new buildings covered by the guidelines.
In government and private buildings taller than 50 meters, three accelerographs are required. One accelerograph each is required for both public and private hospitals and schools . Provincial, city, and municipal halls and buildings must install one accelerograph each. In each commercial or industrial building with an occupancy of a minimum of 1,000 persons or a gross floor area of 10,000 square meters or more, one accelerograph must be installed.
In the United States, the installation of accelerographs is not mandatory for all establishments. The federal government merely requests owners of buildings in earthquake-prone areas to equip their structures with these strong-motion instruments.
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