In this study, we examined 3 techniques of magnitude estimation for earthquake early warning (EEW): corner period Tc, peak predominant period Tmax and initial peak displacement Pd. We established the best fit relation between each of these parameters and magnitude. We also examined real-time parameters like the filter cut-off frequency and the time-window of estimation in order to find the values that give the best fit relation in each technique. We chose eastern Cairo and the South of Sinai because of its high importance in Egypt’s economy and future urbanization as well as the moderate to high seismic activity in this region. We used a dataset of 20 earthquakes between 1999 and 2015, from the Egyptian National Seismic Network catalog, in the target region. All of the selected events, except for one, have local magnitude over 4.0. The results of Tc and Tmax show that the error in magnitude estimation could reach up to 1.0, in this dataset. The results also indicate that Pd is the best parameter for magnitude estimation in EEW. Based on results, we made recommendations that could be extended into the action plan required to achieve an EEW system in Egypt.
Keywords: Earthquake early warning (EEW), Corner period Tc, Peak predominant period Tmax, Initial peak displacement Pd