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Stations on the linear arrays are classified into two groups based on the difference of spectral characteristics of microseisms: one is the stations to the west of the Hino River that exhibited peaks around the period of 3 s in the spectral ratio to a fixed reference station, and the other is those to the east of the Hino River that had no peaks in that period range. The difference of the spectral ratios may be attributed to the lateral change of the depth of basement rock.In order to determine the depth of the basement rock on both sides of the river, we observed microseisms on both sides with vertical-motion seismometers arranged in two-dimensional arrays. We estimated the subsurface structure from phase velocities of observed microseisms by assuming that the main part of the observed microseisms consisted of the fundamental mode of Rayleigh waves, and compared the inferred structure with a deep-drilling log available in the neighborhood. The estimated depths of the basement rock are 0.9 km on the west side and 0.1 km on the east side of the Hino River. This is consistent with the existing result of gravitational survey.

Discontinuity of basement rock depth in the eastern coast of lake Biwa discovered by observations of microseisms.