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- W2152802911 abstract "The purpose of this study is to derive attenuation relationships of the peak ground acceleration (PGA) and peak ground velocity (PGV) in Ilan, Taiwan, including factors of fault type and site effect. A total of 2852 accelerograms recorded from 92 shallow earthquakes with Mw magnitude ranging from 4.0 to 7.7 are used to develop theregionalattenuationrelationships.Twomodelsareused:Model1usesrecordsfrom 65 strong-motion sites. The results will be especially useful for the Central Weather Bureau (CWB) early warning system to quickly assess and report the PGA and PGV maps for effective emergency-response operations. Model 2 uses records from the 46 strong-motion sites with available VS30 to incorporate a site-effect term, aiming to reduce the standard deviation of the predicted ground motion for engineering appli- cations. First, the results show that the fault-type amplification factor decreases faster with increasing magnitude for the strike-slip fault type than the reverse or normal fault types. In addition, from the intraevent residuals as function of distance of horizontal PGA for reverse earthquakes, we found clusters of higher PGAvalues at a distance of 110-130 km from events in southwestern areas. This was probably due to Moho re- flection along paths crossing the Central Mountain Range. Second, the PGVintraevent residual is more closely correlated with VS30 than that of the PGA because the latter is nota simple function ofVS30.Finally, bycomparing thestandard deviations ofthetotal residuals between the observed and predicted values before and after incorporating the fault-type and site-effect (VS30) terms, the change of standard deviation for PGA is 2.3%. In contrast, the PGV standard deviation is significantly decreased by about 11.6%. Evidently, the Model 2 attenuation relationships, especially for PGV, would be better suited for engineering applications." @default.
- W2152802911 created "2016-06-24" @default.
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- W2152802911 date "2013-06-01" @default.
- W2152802911 modified "2023-09-30" @default.
- W2152802911 title "A Study on Fault-Type and Site-Effect (VS30) Parameters in the Attenuation Relationships of Peak Ground Acceleration and Peak Ground Velocity in Ilan, Taiwan" @default.
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- W2152802911 doi "https://doi.org/10.1785/0120120065" @default.
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