Imaging the Three-Dimensional Crust of the Korean Peninsula by Joint Inversion of Surface-Wave Dispersion and Teleseismic Receiver Functions

Yoo, Hyun Jung; Herrmann, Robert B.; Cho, K. H.; Lee, K.

doi:10.1785/0120060134

Cited by 60 publications

(39 citation statements)

References 33 publications

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“…This result is consistent with the previous independent works (e.g., Chang and Baag, 2005;Yoo et al, 2007). The low velocity layers around a depth of 10 km are not seriously interpreted at present because they are not always distinctive and because the detailed geological structure of the Okcheon Fold Belt is expected to be very complicated by locality.…”

Section: Discussionsupporting

confidence: 92%

“…Since recent large teleseismic earthquake data (∆ ≥ 30 o ) of magnitudes larger than 6.5 are included in the analyses, not only the signal-to-noise ratio in the data but also the backazimuth coverage is improved. The velocity structures found in the present work beneath the Okcheon Fold Belt are expected to be more reliable than those by the previous independent works (e.g., Chang and Baag, 2007;Yoo et al, 2007).…”

Section: Introductionsupporting

confidence: 65%

“…Rayleigh-wave phase velocities of the period range of 10−25 s with a 5-second interval which are estimated by Yoo et al (2007) as an average in South Korea are employed. The Rayleigh-wave dispersion diagram is presented in Figure 3.…”

Section: Surface-wave Dispersionmentioning

confidence: 99%

“…Rayleigh wave phase velocities used in this study. Those are excerpted from the average Rayleigh wave phase velocities obtained from teleseismic data of the broadband stations in Korea byYoo et al (2007).…”

mentioning

confidence: 99%

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1D crustal velocity structure beneath broadband seismic stations in the Okcheon Fold Belt of Korea by receiver function analysis

2010

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The crustal velocity structure is one of the fundamental and important subjects for seismology. The receiver function analysis technique is applied to the data from six broadband stations (HKU, JSB, MGB, NPR, SND, and TJN) in the Okcheon Fold Belt of Korea. The genetic algorithm that is independent of the initial model is adopted as the inversion method. The surfacewave dispersion data are used as constraints in the receiver function inversion. Among these stations, the receiver function analyses on the velocity structures beneath stations JSB, MGB, and SND have not been carried out before. Since recent large teleseismic earthquake data of magnitudes larger than 6.5 are included in the analyses, the velocity structures found in the present work are expected to be more reliable than those by the previous independent works. The characteristics of crustal velocity structures in the Okcheon Fold Belt are revealed. The crustal thickness in the Okcheon Fold Belt is estimated to be 32−34 km. The Moho depths are 32, 34, 32, 32−34, 32, and 32 km beneath stations HKU, JSB, MGB, NPR, SND, and TJN, respectively. These results are similar to those found in the previous independent works. The low velocity layers around the depth of 10 km are also found. Geological interpretation or correlations are, however, skipped since they are not always distinctive. Midcrustal velocity discontinuities at the 18-km depth are found beneath stations NPR and TJN although the former is only distinctive. Those at the 22-km depth are also found beneath stations HKU and SND. The crustal velocity structures estimated in this study will be able to offer fundamental information to other geologists, and the geological and tectonic interpretation of the velocity structures is expected.

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Section: Discussionsupporting

confidence: 92%

Section: Introductionsupporting

confidence: 65%

Section: Surface-wave Dispersionmentioning

confidence: 99%

mentioning

confidence: 99%

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1D crustal velocity structure beneath broadband seismic stations in the Okcheon Fold Belt of Korea by receiver function analysis

2010

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“…Recently, studies of velocity tomography have been attempted to obtain the 3-D velocity structure of the Korean Peninsula using seismic data YOO et al, 2007). However, information on 1-D average crustal structure is critical for ease and quick estimation of the source parameters of events in the Korean Peninsula.…”

Section: Introductionmentioning

confidence: 99%

Crustal Structure of the Korean Peninsula Using Surface Wave Dispersion and Numerical Modeling

Cho¹,

Lee

Kang

2011

Pure Appl. Geophys.

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Surface wave dispersion is studied to obtain the 1-D average velocity structure of the crust in the Korean Peninsula by inverting group-and phase-velocities jointly. Group velocities of short-period Rayleigh and Love waves are obtained from crosscorrelations of seismic noise. Multiple-filter analysis is used to extract the group velocities at periods between 0.5 and 20 s. Phase velocities of Rayleigh waves in 10-and 50-s periods are obtained by applying the two-station method to teleseismic data. Dispersion curves of all group and phase velocities are jointly inverted for the 1-D average model of the Korean Peninsula. The resultant model from surface wave analysis can be used as an initial model for numerical modeling of observations of North Korean events for a velocity model appropriated to the Korean Peninsula. The iterative process is focused especially on the surface sedimentary layer in the numerical modeling. The final model, modified by numerical modeling from the initial model, indicates that the crust shear wave velocity increases with depth from 2.16 km/s for a 2-km-thick surface sedimentary layer to 3.79 km/s at a Moho depth of 33 km, and the upper mantle has a velocity of 4.70 km/s.

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Mechanisms driving polymagmatic activity at a monogenetic volcano, Udo, Jeju Island, South Korea

Brenna

Cronin

Smith

et al. 2010

Contrib Mineral Petrol

124

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Imaging the Three-Dimensional Crust of the Korean Peninsula by Joint Inversion of Surface-Wave Dispersion and Teleseismic Receiver Functions

Cited by 60 publications

References 33 publications

1D crustal velocity structure beneath broadband seismic stations in the Okcheon Fold Belt of Korea by receiver function analysis

1D crustal velocity structure beneath broadband seismic stations in the Okcheon Fold Belt of Korea by receiver function analysis

Crustal Structure of the Korean Peninsula Using Surface Wave Dispersion and Numerical Modeling

Mechanisms driving polymagmatic activity at a monogenetic volcano, Udo, Jeju Island, South Korea

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