地すべり地における微小振動観測

Abstract

We observed microseismic events associated with the soil mass movement simultaneously at 9points with their intervals, except 2 points, of about 30 m in a landslide area. The sources of thesignals obtained here are very close to each observational point because they are detected at only onepoint nearest the sources. The spatial variations of the microseismic event rate have good correlationwith the local soil mass movement. The predominant frequency of signals is about 50 Hz and differsfairly at some points. We discuss the possibility of the observation of microseismic waves inducedby the soil mass movement. We also refer to the relation between the predominant frequency ofwaves and the magnitude of the sudden movement of soil mass.