抄録
The Shinkansen Earthquake Early Warning system rapidly estimates earthquake parameters from a single station data. Epicenter locations in this system are estimated utilizing the Principal Component Analysis and the B-Δ method. This paper proposes new methods to improve the performance of epicenter estimation by introducing variable time windows, instead of the conventional fixed time window. It was found that the new method improved the accuracy and speed of the back-azimuth estimation by 28% and 0.25 seconds respectively. Speed of estimation of the epicentral distance was improved by approximately 1.32 seconds, compared with the conventional method.
