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| | Abstract | | Toward assessing the shorter limit of the analyzable wavelength ranges for a Miniature (radius < 1m) Microtremor Array (MMA) method, we have compared the phase velocities obtained by a MMA method with those obtained by a Surface-Wave (SW) method. The comparison was made at multiple points along two measurement lines having soil surface in the Hinode district, Itako City, Ibaraki, Japan. It revealed that the phase velocities by a MMA method are generally higher than those by a SW method in frequency ranges higher than 10Hz. The differences become larger as the frequency becomes higher, and reach 20% on average at 20Hz. These differences can be caused by the differences in the data processing procedure for higher modes. Therefore, we have a plan to infer velocity structures to make more accurate comparison in order to obtain the shorter limit of the wavelength ranges for a MMA method. |
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