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H/V Spectral-ratio Analysis of Microtremors in Jeju Island  

Hong, Myung-Ho (Department of Geophysics, Kangwon National University)
Kim, Ki-Young (Department of Geophysics, Kangwon National University)
Publication Information
Geophysics and Geophysical Exploration / v.13, no.2, 2010 , pp. 144-152 More about this Journal
Abstract
To study the thickness variation of volcanic rocks of Jeju Island, microtremor data were recorded at eight and four sites using short-period and broadband seismometers, respectively, for 30 ~ 60 minutes with a 100 Hz sampling rate. During the daytime, these records show increased cultural noise at frequencies above 1.8 Hz. Natural noise occurs in the frequency range of 0.4 to 0.8 Hz in both daytime and nighttime data. Predominant frequencies determined by the H/V spectral-ratio method are in the range of 0.2 ~ 0.7 Hz. These frequencies decrease gradually as the central part of the Mt. Halla is approached. This may indicate that the basement is warped downward beneath the center of the island, which is consistent with previous gravimetric and magnetic models. Assuming an average shear-wave velocity of 1,800 m/s for the overburden basalts, the depths to basement are estimated to be between 640 and 2,140 m.
Keywords
Jeju Island; thickness variation of volcanic rocks; H/V spectral ratio; microtremor; basement;
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Times Cited By KSCI : 5  (Citation Analysis)
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