Tomographic analysis of surface wave slowness estimated with seismic interferometric processing of continuous microtremor data in the southern Kanto area, Japan

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  • Chimoto Kosuke
    Tokyo Institute of Technology Interdisciplinary School and Engineering, Research Fellow of the Japan Society for the Promotion of Science
  • Yamanaka Hiroaki
    Tokyo Institute of Technology Interdisciplinary School of Science and Engineering

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  • 南関東地域における地震波干渉法に基づく表面波のスローネストモグラフィ解析
  • 南関東地域における地震波干渉法に基づ<表面波のスローネストモグラフィ解析
  • ミナミカントウ チイキ ニ オケル ジシンハ カンショウホウ ニ モトズ<ヒョウメンハ ノ スローネストモグラフィ カイセキ

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Abstract

 Tomographic analysis was conducted using surface wave group velocity estimated with a seismic interferometric process of continuous microtremor data obtained at stations in the southern Kanto area by Yamanaka et al. (2010). The region is divided into 0.125° cells with a constant group velocity in the tomographic analysis. The tomographic image is constructed using the Simultaneous Iterative Reconstruction Technique for slowness of Rayleigh and Love waves. The tomographic maps of the surface wave group velocities at periods of 2 to 6 seconds show the regional variations of the group velocity dispersion curve. We found that the regions of Tokyo bay and lowland have low group velocities, while the western marginal parts of the Kanto basin and the Izu peninsula have high group velocities. The comparison of the tomographic maps between the observed and calculated ones by the existing 3D basin model shows significant differences in the regions of the Izu peninsula, basin edge and Sagami bay. The resulting dispersion curve of the surface wave group velocity in each cell was inverted to a 1D S-wave velocity profile in order to validate the existing 3D model. The results show that the thicknesses of the sedimentary layers are thinner than the previous model in the region of Sagami bay where the differences of the group velocity were significant. It also indicates the possibility of an existence of the sediment layers of the Izu peninsula about 1km deep.<br>

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