Application effectiveness of the microtremor survey method.
The microtremor array exploration method is a method for estimating the S-wave velocity structure from several tens of meters to several kilometers underground. This involves array observation of microtremors (Fig. 1(a)) over several hours by laying out the seismographs on the ground surface at several tens of meters to several kilometers scale.
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The microtremor array observation method was first advocated by Aki (1957), an alternative method was proposed by Capon (1969), and the development towards utilization was made by Horike (1985) and Okada and Matsushima et al. (1990). According to the array observation method, the soil velocity structure, fitted for the obtained dispersion curve of.
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The development of a new exploration method, designated the microtremor survey method (MSM) by Okada et al. (1990), for imaging subsurface structure, using natural microtremors has advanced over the last ten years. This survey method, if used effectively, can furnish a preliminary appraisal before a detailed survey for geological structure.
The microtremor array observation results for the eight sites, the estimated phase velocities from the microtremor array observations (obs.) and the calculated fundamental modes (cal.) of the dispersion curves of the Rayleigh-wave are plotted across the top row.
Microtremor is a low amplitude ambient vibration of the ground caused by man-made or atmospheric disturbances. The term Ambient Vibrations is now preferred to talk about this phenomenon. Observation of microtremors can give useful information on dynamic properties of the site such as predominant period and amplitude.