Wen, K.-L., et al. Paper: Earthquake Early Warning Technology Progress in Taiwan

The dense real-time earthquake monitoring network established in Taiwan is a strong base for the develop-ment of the earthquake early warning (EEW) system. In remarkable progress over the last decades, real-time earthquake warning messages are sent within 20 sec after an event using the regional EEW system with a virtual subnetwork approach. An onsite EEW ap-proach using the first 3 sec of P waves has been de-veloped and under online experimentation. Integrat-ing regional and onsite systems may enable EEWmes-sages to be issued within 10 sec after an event oc-curred in the near future. This study mainly discusses the methodology for determining the magnitude and ground motion of an event