5:15 PM - 6:45 PM
[SSS10-P07] Semi-realtime testing of the Japanese earthquake early warning system IPFx in Taiwan
Keywords:earthquake early warning, seismic network, earthquake monitoring
The extended Integrated Particle Filter (IPFx) algorithm presents a cutting-edge approach to automating source determination within the Japanese earthquake early warning (EEW) system. By integrating a smart phase association scheme, this method significantly enhances earthquake source determination during periods of active seismicity. Currently, the Central Weather Administration in Taiwan utilizes the effective epicenter method for earthquake location within the EEW system. However, accurately identifying the source of offshore events remains challenging due to the majority of stations being land-based. Moreover, the original method encounters limitations in accurately estimating earthquake locations and magnitudes when two earthquakes occur within a half-minute interval and are situated within a 100 km distance. The IPFx method is anticipated to provide improved location estimates for offshore earthquakes and scenarios involving multiple earthquakes within a short timeframe, especially during heightened seismic activity. Furthermore, the IPFx method expedites warnings by initiating the transmission of the first message upon activation by three stations, thereby promising to enhance the speed and accuracy of the Taiwanese EEW system. This study integrates the IPFx method into a semi real-time earthquake early warning system and compares its performance with the original method. Notably, during the 2023 ChiaYi earthquake with a magnitude of 5.5, the IPFx method delivered reliable estimations of earthquake locations and magnitudes. The semi real-time system introduces a 15-minute delay, enabling the dissemination of earthquake information approximately 15 minutes after the event occurs.