Abstract
A significant amount of work has been conducted in the Japanese islands on high-precision positioning, surveying, natural disaster mitigation, reference frame, and datum definitions; however, there is substantial scope for exploring the current seismotectonic activity of Japan, which would provide further awareness of disaster management. The short recurrence time of great inter-plate earthquakes and well-recorded geodetic observations provide one of the best examples to analyze the combination of contemporary deformation and seismic intensity in Southwest (SW) Japan. In the current study, we analyzed three districts of SW Japan which include mainly Kyushu district and parts of Chugoku and Shikoku districts. We predicted Global Navigation Satellite System (GNSS) measurements based on Amurian-fixed reference frame (AREF) velocities with the help of singular spectrum analysis (SSA) method and examined the regional deformation from April 01, 2010 to December 31, 2018. In addition, we analyzed the earthquakes clustered calculated by the nearest neighborhood distance method, which showed prominently bimodal seismicity of SW Japan and revealed the existence of two statistically distinct earthquake populations. The events inside a cluster were normally close to their nearest neighbors, whereas events from distinct clusters were comparatively aloof from each other. Finally, the paper provides the spatial strain and rotational rate variation for selected seismotectonic districts that are in relatively good agreement with the seismic deformation inferred from earthquake focal mechanisms. We believe that our integrated approaches would provide a better insight into the active deformation of SW Japan.
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Acknowledgements
The research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2016R1D1A1B01009872). The authors appreciate the GNSS Earth Observation Network (GEONET) for establishing and maintaining the GNSS stations in Japan. This GNSS data are available at the Geospatial Information Authority of Japan (GSI) website (http://terras.gsi.go.jp). The author also thanks Prof. Bob King from MIT for providing the GAMIT-GLOBK software and helping to resolve the issues related to the software. Our sincere thanks to Prof. G. Teza for giving the strain analysis software.
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Ansari, K., Park, KD. Contemporary deformation and seismicity analysis in Southwest Japan during 2010–2018 based on GNSS measurements. Int J Earth Sci (Geol Rundsch) 108, 2373–2390 (2019). https://doi.org/10.1007/s00531-019-01768-w
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DOI: https://doi.org/10.1007/s00531-019-01768-w