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http://dx.doi.org/10.5000/EESK.2008.12.5.039

Distance Dependency of Corner Frequencies for Earthquakes in and around the Korean Peninsula  

Shin, Jin Soo (한국지질자원연구원)
Kang, Tae-Seob (한국지질자원연구원)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.12, no.5, 2008 , pp. 39-45 More about this Journal
Abstract
The source parameters of 85 events ($1.6\;{\leq}\;M_L\;{\leq}\;4.9$) that occurred in and around the Korean Peninsula during 2006 and 2007 were analyzed by an iterative spectral fitting procedure. The data set consists of 487 S-wave trains on three-component seismograms recorded at broadband seismograph stations in the southern part of the Korean Peninsula. Moment magnitudes for each event were determined using spectral analyses of the seismograms, and the results were compared with the variation in corner frequencies with hypocentral distance. Corner frequencies have a tendency to decrease with increases in hypocentral distance, and the decrease is smaller the larger the moment magnitude. We define the measured corner frequency on a displacement spectrum as the apparent corner frequency. Although it was reported that the distance dependency of the corner frequency was found in some regions, such as the eastern Canadian Shield and the Baltic Shield, the origin of the phenomenon is not certain yet.
Keywords
spectral analysis; moment magnitude; corner frequency; distance dependency;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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