Continued to the previous studies an experimental research on the long-period microtremors as an effective tool for elucidating dynamic ground characteristics during an earthquake is extended.
A stressed point in this paper is on examination of the stability of the predominant period by means of the simultaneous and long-termed microtremors observations on basemental rock and deep soil deposit. This clarified that the predominating period on the basemental rock changes as times elapse, while on the soil deposit it is stable regardless of the surrounding meteorological conditions.
Another point is on a proposal of a standardized microtremors observation scheme as a summary of the previous results. This describes instrumnts, spacial and temporal observation procedure, data processing, and interpretation we should introduce, for arriving at a better success.
