摘要：We propose a new approach to improve the accuracy of the back-azimuth estimation in real-time by using a single station record.Compared with the conventional approach in which the length of the time window for the analysis is fixed for all data, the accuracy and speed of the estimation are drastically improved by introducing a variable-length time window which is determined by the first half cycle of the wavelength of the initial P -wave, because this window tends to reduce the influences of trailing scattered waves.The analysis, using the K-NET dataset, shows that the estimation, using this new approach, is improved by 28% and 0.25 s in accuracy and speed, respectively.
关键词：Earthquake early warning ;back-azimuth ;principal component analysis ;single station method ;on-site method
