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Early warning systems can estimate the possible-shaking intensity of the earthquake based on the initial P-waves on-site. Researchers have used the following two indicators: the initial peak P-wave displacement () and the ground motion characteristic period (). In this study, we re-examine the performance of the two indicators by employing ground motion data from the P-Alert low-cost network in Taiwan. We have found that the signal-to-noise ratio of displacement () is effective for data selection. In addition, we have observed the irregular behavior ofin the P-Alert dataset.

journal of earthquake engineering

Revisiting the Initial Peak P-Wave Displacement and the Ground Motion Characteristic Period with Signal-To-Noise Ratios: A Case Study Using a Low-Cost Sensor Network in Taiwan