Performance of Broadband Seismic Network of the Philippines
Arnaldo A. Melosantos*, Karl Vincent C. Soriano*,
Ponzch Colleen M. Alcones*, Jose U. Pantig*,
Jun D. Bonita*, Ishmael C. Narag*, Hiroyuki Kumagai**,
and Hiroshi Inoue***
*Philippine Institute of Volcanology and Seismology (PHIVOLCS), PHIVOLCS Bldg., C.P. Garcia Avenue, University of the Philippines Campus, Diliman, Quezon City, the Philippines
**Graduate School of Environmental Studies, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
***National Research Institute for Earth Science and Disaster Prevention (NIED), 3-1 Tenno-dai, Tsukuba-shi, Ibaraki 305-0006, Japan
The Philippine Institute of Volcanology and Seismology implements a program on seismic and tsunami network development. It also plans to expand the Philippine seismic network (PSN), commission new stations, rehabilitate and improve existing stations, and repair and maintain the PSN. The PSN consists of 70 stations, 12 of which use broadband seismometers. Stations are strategically located to maximize the use of data from stations. The broadband seismic network is being developed to monitor earthquakes in and around the Philippines and to provide more accurate data for calculating earthquake parameters. Using data obtain from broadband records, the systemwill immediately calculate earthquake parameters useful for making decisions that provide highly accurate, timely warnings and information. PSN performance is evaluated in this study to ensure this. We consider background noise by analyzing station locations and conditions and their data contribution to SWIFT CMT solutions. We also use power spectral density (PSD) to compare station noise levels to global standards and study data gaps and their causes. Based on the above parameters and using a scale of poor-goodbest, the broadband seismic network is currently performing well.
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