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http://dx.doi.org/10.5000/EESK.2006.10.3.101

Modeling of Near Fault Ground Motion due to Moderate Magnitude Earthquakes in Stable Continental Regions  

Kim, Jung-Han (서울대학교 지구환경시스템공학부)
Kim, Jae-Kwan (서울대학교 지구환경시스템공학부)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.10, no.3, 2006 , pp. 101-111 More about this Journal
Abstract
This paper proposes a method for modeling new fault ground motion due to moderate size earthquakes in Stable Continental Regions (SCRs) for the first time. The near fault ground motion is characterized by a single long period velocity pulse of large amplitude. In order to model the velocity pulse, its period and peak amplitude need be determined in terms of earthquake magnitude and distance from the causative fault. Because there have been observed very few new fault ground motions, it is difficult to derive the model directly from the recorded data in SCRs. Instead an indirect approach is adopted in this work. The two parameters, the period and peak amplitude of the velocity pulse, are known to be functions of the rise time and the slip velocity. For Western United States (WUS) that belongs active tectonic regions, there art empirical formulas for these functions. The relations of rise time and slip velocity on the magnitude in SCRs are derived by comparing related data between Western United States and Central-Eastern United States that belongs to SCRs. From these relations, the functions of these pulse parameters for NFGM in SCRs can be expressed in terms of earthquake magnitude and distance. A time history of near fault ground motion of moderate magnitude earthquake in stable continental regions is synthesized by superposing the velocity pulse on the for field ground motion that is generated by stochastic method. As an demonstrative application, the response of a single degree of freedom elasto-plastic system is studied.
Keywords
near fault ground motion; velocity pulse; stable continental regions; ground motion time history; response spectrum; moderate seismic risk;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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