1-D velocity model for the North Korean Peninsula from Rayleigh wave dispersion of ambient noise cross-correlations

Monitoring seismic activity in the north Korean Peninsula (NKP) is important not only for understanding the characteristics of tectonic earthquakes but also for monitoring anthropogenic seismic events. To more effectively investigate seismic properties, reliable seismic velocity models are essential...

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Bibliographic Details
Published in:Journal of seismology 2020-02, Vol.24 (1), p.121-131
Main Authors: Lee, Sang-Jun, Rhie, Junkee, Kim, Seongryong, Kang, Tae-Seob, Cho, Chang Soo
Format: Article
Language:English
Subjects:
Ambient noise
Anthropogenic factors
Bayesian analysis
Correlation
Correlation analysis
Dispersion
Earth and Environmental Science
Earth Sciences
Earthquakes
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Goodness of fit
Hydrogeology
Mathematical models
Noise monitoring
Offshore
Original Article
Probability theory
Rayleigh waves
Seismic activity
Seismic data
Seismic properties
Seismic velocities
Seismological data
Seismology
Structural Geology
Tectonics
Tensors
Velocity
Wave dispersion
Waveforms
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Summary:Monitoring seismic activity in the north Korean Peninsula (NKP) is important not only for understanding the characteristics of tectonic earthquakes but also for monitoring anthropogenic seismic events. To more effectively investigate seismic properties, reliable seismic velocity models are essential. However, the seismic velocity structures of the region have not been well constrained due to a lack of available seismic data. This study presents 1-D velocity models for both the inland and offshore (western East Sea) of the NKP. We constrained the models based on the results of a Bayesian inversion process using Rayleigh wave dispersion data, which were measured from ambient noise cross-correlations between stations in the southern Korean Peninsula and northeast China. The proposed models were evaluated by performing full moment tensor inversion for the 2013 Democratic People’s Republic of Korea (DPRK) nuclear test. Using the composite model consisting of both inland and offshore models resulted in consistently higher goodness of fit to observed waveforms than previous models. This indicates that seismic monitoring can be improved by using the proposed models, which resolve propagation effects along different paths in the NKP region.
ISSN:1383-4649
1573-157X
DOI:10.1007/s10950-019-09891-6