Presenter: Meng-Hsuan Shih
Date: 2017/06/01
Abstract
In recent years, there has been a wide development on the application of earthquake early warning system (EEW). But the accuracy, affected by the site still existed some estimated errors, has to be strengthen. In order to secure the life safety and property, improving the accuracy of EEW is important. If the error can be improved, accompanied with data information from the intense observation around Taiwan, the EEW can offer a better hazard prediction for different regions.
In this study, we used the earthquake event (with magnitude over five) recorded by TSMIP from 1993 to 2014. For P d -τ c method, we performed NCREE model (Tsai et al. 2009) which Hsu proposed in 2015 by using parameter P d and τ c (Wu, Y.M. and Kanamori. 2005a and 2005b) and station correction to estimate magnitude and hypo-distance. Once we got the estimated magnitude and hypo-distance after station correction, we could exactly estimate the PGA through the attenuation equation and its site correction function. In Pd method, this study estimated the PGA with two kinds of models. One is the model established with P d and observed PGA of whole regions in Taiwan (Whole regional Model) and the other one is small regional model established with regional P d and PGA. In order to improve estimated PGA, we performed the site correction after getting initially estimated PGA.
Reference
Tsai, K.C., Lin, P.Y., Lin,T.K., Lin, C.C, Lin, Y.B., Lin, J.L., W, Y.T., C, T.M., Shen, Z.P. and Chung, C.S., .(2009) Preliminary study of added-value information and analysis for earthquake early warning system, National center for research on earthquake engineering, NCREE-09- 013
Wu, Y.M. and Kanamori, H., 2005a, Experiment on onsite early warning method for the Taiwan early warning system, Bull. Seism. Soc. Am., 95, 347-353.
Wu, Y.M. and Kanamori, H., 2005b, Rapid assessment of damage potential of earthquakes in Taiwan from the beginning of P Waves, Bull. Seism. Soc. Am., 95, 1181-1185.
Hsu, C.C., 2015, Station correction of earthquake early warning system in Ilan, Taiwan, Institute of geophysics, national central university, 140.