The ShakeAlert: Generating real-time predicted shaking map based on the attenuation relationship of peak ground acceleration.

The feasibility of the Earthquake Early Warning System (EEWS) based on the low-cost P-alert seismic network in Taiwan has been proved by a few earthquake events since 2010. This dense network can produce detailed shaking maps and identify direction of source rupture in near real-time. By an advanced approach, with the real-time acceleration data and the time-dependent attenuation relationship of peak ground acceleration (PGA), the predicted PGA value can immediately be computed before the observed PGA arrival, that can provide sufficient time for hazard assessment and emergency response, comparing with the conventional shaking map. Here, we use the term "ShakeAlert" which can predict real-time shaking map when an event occurs. The perfomance of ShakeAlert was explored by the moderate-to-large inland earthquake (ML > 5.5) records. For example, result of Meinong earthquake occurred on 2nd February 2016, it can provide the stable report and alert shaking map at 16 seconds after the earthquake occurred. The reporting time of new system with considering the PGA saturation condition, the possible maximum PGA of an event, can be down to 8 seconds after the earthquake occurred. In contrast to traditional methods, the ShakeAlert technique can quickly identify possible damage region, providing the valuable warning information for hazard mitigation.