An Alternative Amplitude Based National Earthquake Early Warning System

Abstract eng:
National earthquake early warning systems (EEWS) are one of powerful strategies to mitigate effect of earthquake disaster in the society. However, they are not developed particularly for the engineering applications. Many engineering based companies use hybrid systems that utilize both national EEWS and their own onsite warning. This is mainly because, they are skeptical on the use of P-wave based correlation equations and the false rate along with national EEWS. In this study, I introduce an amplitude and network based earthquake early warning and alarm system (GETAlarm) that is developed for the Disaster and Emergency Management Presidency of Turkey (AFAD). In order to forecast intensity of a location of interest, GETAlarm does not calculate magnitude of the earthquake but rather estimate the intensity in the epicenter and uses direct intensity attenuation relationship. Algorithm uses available direct amplitude measurements at the stations disinterestedly whether amplitudes are from P- or S- waves. This make GETAlarm a robust fail-safe algorithm for engineering applications. GETAlarm is a standalone alternative EEW methodology that also could be integrated into current EEWS to support and confirm alerts. Because it is based on observations of actual shaking, it cannot generate a false event. It is currently being tested in Hatay prefecture, Turkey within a small seismic network. I introduced GETAlarm concept and its application to high-speed rail lines (YHT) of Turkish State Railways. I showed its simulated performance for a few earthquakes in Turkey.

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