[J04-1] Geohazard early warning systems I

[J04-1-01] ShakeAlert@taiwan

^○Yih-Min Wu^{1, 2}, Ming Yang¹, TC Huang² (1.National Taiwan University, Taipei, Taiwan, 2.Academia Sinica, Taipei, Taiwan)

invited

The Earthquake Early Warning System (EEWS) based on the low-cost P-Alert seismic network in Taiwan has proved indispensable by a few earthquake events since 2010. This dense network can produce detailed shaking maps and identify direction of source rupture in almost real-time. Equip with real-time acceleration data and the time-dependent attenuation relationship of peak ground acceleration (PGA), our system, ShakeAlert@taiwan, can compute predicted PGA immediately before the observed PGA arrive. This advantage can provide sufficient time for hazard assessment and emergency response, comparing to the conventional shaking map. The performance of ShakeAlert@taiwan was tested against historical moderate-to-large inland earthquake (ML > 5.5) events. Take 2016/02/5 Meinong, Taiwan earthquake as an example, it converge to stable result and produce shaking map within 16 seconds after the earthquake occurred. The processing time for possible maximum PGA, taking into account the PGA saturation, can be reduced to 8 seconds. In comparison with traditional methods, ShakeAlert@taiwan can quickly identify possible damage region and provide the valuable warning information for hazard mitigation.