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Bulletin of the Seismological Society of America; June 2007; v. 97; no. 3; p. 1012-1018; DOI: 10.1785/0120060097
© 2007 Seismological Society of America
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Spatial Distribution of Coda Q in South Korea

Sukyoung Yun1,4, Won Sang Lee*,2,4, Kiehwa Lee1 and Myung Hyun Noh3

1 Seismological Observatory, SEES
Seoul National University
Seoul, 151–742 Korea
 (S.Y., K.L.)
2 Department of Geophysics, Graduate School of Science
Tohoku University
Sendai, 980-8578, Japan
 (W.S.L.)
3 Korea Institute of Nuclear Safety (KINS)
Daejeon, Korea
 (M.H.N.)
4 Korea Polar Research Institute (KOPRI)
Incheon 406-840, Korea
 (S.Y., W.S.L.)

* Present address: Korea Polar Research Institute (KOPRI), Songdo TechnoPark, 7-50, Songdo-dong, Yeonsu-gu, Incheon 406-840, Korea; wonsang{at}kopri.re.kr

Analyzing spectral attenuation of coda waves, we first mapped coda Q- values in the crust over the whole of South Korea. During the period from 1995 to 2004, we selected 574 north–south-component seismograms with epicentral distances less than 100 km from 328 earthquakes with magnitudes between 1.4 and 5.2. We estimated coda Q-values using the single isotropic scattering model at center frequencies of 1.5, 3, 6, 9, 12, 15, and 18 Hz, and found significant spatial variation over all frequency ranges and strong frequency dependence of coda Q in the region. The estimated coda Q-value at 1 Hz (Q0) and the {eta}-value ranges are 80–300 and 0.4–1.1, respectively. The values have strong correlation with the regional geology in the Korean peninsula. Low Q0-values are mainly obtained in the regions comprising sedimentary strata in southeastern South Korea, whereas granite regions in the northern part of South Korea show high Q0. The Q0-values in the study area agree well with those of the eastern China and Kyushu, western Japan. Furthermore, our {eta}-values are also in good agreement with those of Japan.

Online material: Locations of seismometers, list of event-station pairs, and linear regression of QC measurements.




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W. S. Lee, S. Yun, and J.-Y. Do
Scattering and Intrinsic Attenuation of Short-Period S Waves in the Gyeongsang Basin, South Korea, Revealed from S-Wave Seismogram Envelopes Based on the Radiative Transfer Theory
Bulletin of the Seismological Society of America, April 1, 2010; 100(2): 833 - 840.
[Abstract] [Full Text] [PDF]


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