Imaging the Upper Crust of the Korean Peninsula by Surface-Wave Tomography

Cho, K. H.; Herrmann, Robert B.; Ammon, Charles J.; Lee, K.

doi:10.1785/0120060096

Cited by 116 publications

(72 citation statements)

References 13 publications

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“…The tomographic maps they produced agree well with the known geology and previous seismic studies in the region. Since then, surface wave tomography using interferometric Rayleigh and Love waves, commonly referred to as ambient noise tomography, has become an increasingly employed method to successfully produce subsurface velocity models on regional and continental scales in areas such as the United States (Bensen et al, 2008; Lin et al, 2008;Shapiro et al, 2005;Sabra et al, 2005b;Liang and Langston, 2008), Australia (Arroucau et al, 2010;Rawlinson et al, 2008;Saygin and Kennett, 2010), New Zealand (Lin et al, 2007;Behr et al, 2010), Antarctica (Pyle et al, 2010), Iceland (Gudmundsson et al, 2007), China (Zheng et al, 2008;Li et al, 2009;Zheng et al, 2010), South Africa , Europe (Villaseñ or et al, 2007;Yang et al, 2006), South Korea (Cho et al, 2007) the Tibetan Plateau (Yao et al, 2006(Yao et al, , 2008Li et al, 2009), and in this paper, Scotland.…”

Section: Ambient Noise Tomographymentioning

confidence: 99%

Seismic interferometry and ambient noise tomography in the British Isles

Nicolson

Curtis

Baptie

et al. 2012

Proceedings of the Geologists' Association

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Section: Ambient Noise Tomographymentioning

confidence: 99%

Seismic interferometry and ambient noise tomography in the British Isles

Nicolson

Curtis

Baptie

et al. 2012

Proceedings of the Geologists' Association

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“…The measurements are made on the 1 year stacks of the daily cross correlations, for which the causal and anticausal signals have been averaged. We use the PGSWMFA (PGplot Surface Wave Multiple Filter Analysis) code [Cho et al, 2007] to make the group velocity measurements for each station pair. This measurement routine is based on the traditional multiple-filter frequency-time analysis (FTAN).…”

Section: Group Velocity Measurementsmentioning

confidence: 99%

CrustalV_Sstructure in northwestern Canada: Imaging the Cordillera-craton transition with ambient noise tomography

Dalton¹,

Gaherty²,

Courtier³

2011

J. Geophys. Res.

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Crustal seismic velocity structure in northwest Canada is imaged using group velocity measurements derived from ambient noise cross correlations. The focus area surrounds the Canadian Northwest Experiment (CANOE) array, a 16 month deployment of 59 broadband seismic stations. The CANOE array extended from the Northern Cordillera on the west into the Archean Slave province to the east, crossing crustal terranes that span ∼4 Gyr of Earth history. Forty broadband stations from the Canadian National Seismograph Network and the POLARIS network are also included. The Green's function for each pair of stations is estimated by cross‐correlating 24 h long time series of ambient noise for each day in the time period July 2004 to June 2005. Fundamental mode Rayleigh waves are observed on cross‐correlated vertical component records and Love waves on the transverse components. The group velocity measurements are inverted for 3‐D shear wave velocity within the crust. Local sensitivity kernels are used to account for the effects of a laterally variable sedimentary layer at shallow depths, and receiver function P‐s differential times at the CANOE stations constrain total crustal thickness. Known sedimentary basins dominate lateral variations in wave speed in the shallow crust. In the middle crust, the model contains a strong low‐velocity region that correlates spatially with the location of Proterozoic metasedimentary rocks that have been inferred from active source reflection profiles to occupy much of the crust beneath the Cordilleran terranes. Velocity variations in the lower crust, which are weakly resolved due to the limited period range of our data set (5–20 s), suggest a west‐to‐east transition from lower to higher wave speeds that aligns with the Cordilleran deformation front in parts of the study area. The results presented here are consistent with but do not confirm the notion of Proterozoic strata throughout much of the Cordilleran crust. These metasedimentary rocks, if present, must have experienced some deformation and metamorphism in order to also be consistent with upper mantle seismic models that contain a sharp transition from low to high velocity across the deformation front.

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“…These studies resulted in group speed maps at short periods (7.5 -15 s) that display a striking correlation with the principal geological units in California with low-speed anomalies corresponding to the major sedimentary basins and high-speed anomalies corresponding to the igneous core of the main mountain regions. Group velocity maps have also been obtained at larger scales and longer periods across much of Europe [Yang et al, 2007], in South Korea at very short periods [Cho et al, 2007], and in Tibet at long periods [Yao et al, 2006]. However, threedimensional (3-D) S wave velocity inversion has not been performed because of complex propagation of the observed waves.…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional crustal S wave velocity structure in Japan using microseismic data recorded by Hi‐net tiltmeters

2008

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[1] We developed a three-step method for three-dimensional (3-D) S wave velocity tomography by fitting synthetic cross spectra to the observed ones of ambient seismic noise. We applied this method to the recording of Hi-net tiltmeters in Japan at 679 stations from June 2004 to December 2004. First, we calculated normalized cross spectra between radial components and those between transverse components for every pair of stations. The first step is local 1-D S wave velocity inversion for each station assuming small lateral heterogeneity under a 100-km circle of a station. We measured the dispersion curves of fundamental Rayleigh waves, fundamental Love waves, and first overtone of Love waves by fitting the synthetic cross spectra to the observed ones between pairs of stations within the circle. We inverted the measured dispersion curves for obtaining a 1-D S wave velocity model. The second step is the inversion of the observed cross spectra for obtaining path-averaged 1-D S wave velocity structure. The third step is the inversion of the resultant path-averaged structures for obtaining 3-D S wave velocity structure (0.1°Â 0.1°Â 1 km grid from the surface to a depth of 50 km) using ray approximation. The resultant S wave velocity structures show clear low-velocity anomalies along tectonic lines from the surface to a depth of 20 km. In particular, along the Hidaka mountain range, we observed S wave perturbation more extreme than À20%. They also show low-velocity anomalies under volcanoes in Kyusyu and Tohoku. In the southwestern part of Shikoku, our results show a clear low-velocity anomaly corresponding to an accretional belt (Shimanto belt). Below 20 km, we observe a low-velocity anomaly in the center of Japan, which suggests a thick crust.Citation: Nishida, K., H. Kawakatsu, and K. Obara (2008), Three-dimensional crustal S wave velocity structure in Japan using microseismic data recorded by Hi-net tiltmeters,

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Imaging the Upper Crust of the Korean Peninsula by Surface-Wave Tomography

Cited by 116 publications

References 13 publications

Seismic interferometry and ambient noise tomography in the British Isles

Seismic interferometry and ambient noise tomography in the British Isles

CrustalV_Sstructure in northwestern Canada: Imaging the Cordillera-craton transition with ambient noise tomography

Three‐dimensional crustal S wave velocity structure in Japan using microseismic data recorded by Hi‐net tiltmeters

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Imaging the Upper Crust of the Korean Peninsula by Surface-Wave Tomography

Cited by 116 publications

References 13 publications

Seismic interferometry and ambient noise tomography in the British Isles

Seismic interferometry and ambient noise tomography in the British Isles

CrustalVSstructure in northwestern Canada: Imaging the Cordillera-craton transition with ambient noise tomography

Three‐dimensional crustal S wave velocity structure in Japan using microseismic data recorded by Hi‐net tiltmeters

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CrustalV_Sstructure in northwestern Canada: Imaging the Cordillera-craton transition with ambient noise tomography