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Imaging the Kanto Basin bedrock with noise and earthquake autocorrelations
  • Loïc Viens,
  • Chengxin Jiang,
  • Marine Denolle
Loïc Viens
Disaster Prevention Research Institute, Kyoto University

Corresponding Author:viens.loic.58r@st.kyoto-u.ac.jp

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Chengxin Jiang
Australian National University
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Marine Denolle
Harvard University
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Sedimentary basins can strongly amplify seismic waves from earthquakes. To better predict strong ground motions, thorough knowledge of sediment thickness and internal basin structure is required. This study maps the deep and complex bedrock shape of the Kanto Basin, Japan, using ambient seismic noise and earthquake autocorrelation functions (ACFs). Noise ACFs are computed using one month of continuous data recorded by the vertical component of 287 MeSO-net stations located in the greater Tokyo area. Earthquake ACFs are obtained from the P-wave records at the MeSO-net stations of 50 Mw 6+ teleseismic earthquakes. Both noise and earthquake ACFs exhibit great similarity in P-wave reflections, confirming that the same wavefield is extracted with both methods. We finally map the basin bedrock geometry and find that it is comparable with that from an existing 3-D velocity model.