2:30 PM - 2:45 PM
[S07-5-05] Strong-Motion Observation Network in the Philippines
Issues raised after the July 16, 1990 M7.8 Luzon Earthquake and public concern over a possible large earthquake that may occur along the Valley Fault System that transects Metropolitan Manila prompted Philippines Institute of Volcanology and Seismology (PHIVOLCS) to establish a Strong-Motion (SM) observation network in the Philippines in 1992. The SM network initially consist of only four stations operating within the metropolis and this has expanded to a network of ten stations by early 2000. Since then, the network has expanded its coverage and is presently composed of thirty-five and twelve instruments in cities in Luzon and Davao respectively, with plans to cover other areas of the country. The establishment of this network aims to truly record earthquake ground motions especially near active faults and areas with concentration of population and different types of buildings.The Kinemetrics K2 strong-motion accelerograph is the major instrument of the network. The recording sensor is Episensor triaxial force balance accelerometer mounted orthogonally in one small convenient package within the recorded box.
Some of the significant earthquake events that have been recorded by different stations of the SM network include the 1999 M6.8 Hermana Mayor Island Earthquake, the 16 June 2012 M6.0 Zambales Earthquake, the 31 August 2012 M7.6 Offshore Eastern Samar Earthquake and 25 June 2014 M5.8 Occidental Mindoro Earthquake. Records of these events exemplify varying site responses at different geologic conditions.
Recorded events are initially analyzed and catalogued in a databased of digital strong ground motion together with station information and important operational dates. The strong-motion database will serve as a centralized resource for accelerograms of relevant Philippine earthquakes to support scientific research, earthquake engineering and the updating of the National Structural Code of the Philippines.
Some of the significant earthquake events that have been recorded by different stations of the SM network include the 1999 M6.8 Hermana Mayor Island Earthquake, the 16 June 2012 M6.0 Zambales Earthquake, the 31 August 2012 M7.6 Offshore Eastern Samar Earthquake and 25 June 2014 M5.8 Occidental Mindoro Earthquake. Records of these events exemplify varying site responses at different geologic conditions.
Recorded events are initially analyzed and catalogued in a databased of digital strong ground motion together with station information and important operational dates. The strong-motion database will serve as a centralized resource for accelerograms of relevant Philippine earthquakes to support scientific research, earthquake engineering and the updating of the National Structural Code of the Philippines.