A Study of Pd Attenuation for Earthquake Early Warning System in Taiwan
Date Issued
2009
Date
2009
Author(s)
Huang, Wei-Ting
Abstract
Taiwan is located in the circum-Pacific seismic zone where earthquakes occur frequently and large one may induce disaster. Earthquake early warning (EEW) system is one of methods to reduce the seismic hazard. The EEW system is operated after a large earthquake occurrence. The characteristics of initial P waves are used to estimate the possible earthquake magnitude and intensity for the early warning purpose. Before strong motion coming, an EEW system would give an alert to a distant metropolitan region for real-time hazard mitigation. According to the previous studies, the peak displacement of the initial first three seconds after P arrival from the vertical component, Pd is a good parameter for the EEW purpose. Currently, the empirical attenuation relationship of Pd in Taiwan region is not yet be determined. Thus, the broadband and strong motion records from Central Weather Bureau and Academia Sinica, Taiwan were used to determine the Pd attenuation relationship. Totally, 163 and 41 for shallow (focal depth less than 40 km) and deeper events (focal depth large than 40 km) were used, respectively. The Pd attenuation relationships for the shallow (1) and deeper (2) earthquakes are determined as follows: og(Pd)＝-2.616+0.774M-1.599log(R) S.D.V.＝0.358 (1)og(Pd)＝-2.173+0.854M-1.946log(R) S.D.V.＝0.355 (2) According to these relationships, after the hypocenter is determined the earthquake magnitude (MPd) could be estimated using Pd. Using the closest six stations to determine the magnitude the standard deviation of the shallow and deep earthquakes are 0.25 and 0.14, respectively. The uncertainties are reasonable small enough for EEW purpose.
Subjects
Earthquake Early Warning
magnitude
earthquake
P-wave warning approach
SDGs
Type
thesis
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