Figure 3. Taiwan operates several earthquake early warning systems. All the earthquakes on the day of the mainshock that triggered a warning as part of the Palert system are shown as purple circles on this map. The smaller colored circles are the local shaking intensities across Taiwan that are associated with the April 2 mainshock. The density of these observations is perhaps only surpassed in Japan. The Palert system is accessible in real time from the Temblor-E-DREaM app (app.temblor.net). Credit: Stein et al., 2024, CC BY-NC-ND 4.0