2021 Volume 21 Issue 2 Pages 2_57-2_69
Earthquake disaster prevention systems using early warning seismometers have been introduced to ensure safety during an earthquake for high speed rails in Japan and have quickly suspended the trains during past earthquakes. An early warning seismometer estimates the epicentral location and magnitude just after detecting the arrival of P-wave when an earthquake occurs. Because the seismometers utilize weak initial P-wave information to estimate seismic parameters, it is expected that the installation environment of the seismometers affects the estimation accuracy, but this effect is not clear. In this study, in order to improve the estimation accuracy of the epicentral location by the seismometers, we evaluated the relationship between the characteristics of seismic observation sites and the estimation error of epicentral locations. Then we suggested the selecting method of the seismic observation site and confirmed its effect.
