Development of Seismograph Equipped with Improved Algorithm for Earthquake Early Warning

摘要

A new seismograph for earthquake early warning in the field of railways has been developed and field tests have been conducted in order to improve the speed and reliability of warnings issued based on single-station P-wave data. The seismograph is equipped with an integrated software program including new algorithms for estimating epicentral distance, back-azimuth to the epicenter, and size of magnitude as well as an updated algorithm for noise discrimination. To evaluate overall performance of the seismograph, long-term field tests have been carried out in conditions reproducing real situations, such as close to tracks and seismic station boreholes. Results confirmed that the seismograph processed P-wave detection, seismic parameter estimation, and noise discrimination, stably and adequately.