Early Estimation of Seismic Hazard for Strong Earthquakes in Taiwan |
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Authors: | Wen-Yu Jean Yu-Wen Chang Kuo-Liang Wen Chin-Hsiung Loh |
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Institution: | (1) National Center for Research on Earthquake Engineering, Taipei, Taiwan, ROC;(2) Institute of Applied Geology, National Central University, Taiwan, ROC;(3) Department of Civil Engineering, National Taiwan University, Taipei, Taiwan, ROC |
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Abstract: | A shakemap system providing rapid estimates of strong ground shaking could be useful for emergency response providers in a
damaging earthquake. A hybrid procedure, which combines site-dependent ground motion prediction models and the limited observations
of the Real-Time Digital stream output system (RTD system operated by Central Weather Bureau, CWB), was set up to provide
a high-resolution shakemap in a near-real-time manner after damaging earthquakes in Taiwan. One of the main factors that affect
the result of ground motion prediction analysis is the existence of site effects. The purpose of this paper is to investigate
the local site effects and their influence in the ground shaking and then establish an early estimation procedure of potential
hazard for damaging earthquakes. Based on the attenuation law, the site effects of each TSMIP station are discussed in terms
of a bias function that is site and intensity-level dependent function. The standard deviation of the site-dependent ground
motion prediction model can be significantly reduced. The nonlinear behavior of ground soil is automatically taken into account
in the intensity-level dependent bias function. Both the PGA and the spectral acceleration are studied in this study. Based
on the RTD data, event correctors are calculated and applied to precisely estimate the shakemap of damaging earthquakes for
emergency response. |
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Keywords: | shakemap damaging earthquake earthquake emergency response attenuation law site effects |
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