Feasibility of earthquake early warning system (EWS) for the city of Lima, Peru, was investigated using seismic waveform data from the newly installed real-time strong motion observation network. We selected waveform data from 24 earthquakes (ML>3.5, depth<100 km) and estimated sizes and locations of the events using initial P-wave portions, based on the conventional approaches. For the estimation of earthquake magnitude, we determined “τc” parameter using 3 s time window after the P-wave onset. We found a reasonable correlation between the estimated and catalogue magnitudes for earthquakes in the vicinity (hypocentral distance<130 km). The hypocenter locations were determined with the detected P-wave arrival times. To investigate the accuracy of existing ground-motion prediction equations (GMPEs) in a real-time scheme, we selected two GMPEs for subduction zone earthquakes to compare the predicted peak ground accelerations (PGA) with observed ones. We also confirmed that the size of blind zones of the EWS is not so large for most earthquakes and it is possible to give an alert to the city of Lima before S-wave arrivals, if a hypocenter location was accurately determined.
Keywords: Earthquake Early Warning System, Hypocenter, Peak Ground Acceleration, Blind zone.