Author(s)

T. Chiba & J. Kimura

Abstract

Rotary spectral analysis is carried out using records of earthquake motion taken with a dense seismometer array. It is shown that rotary spectral analysis is useful in determining seismometer setting errors. This study also demonstrates that rotary spectral analysis can be used to determine the spatial variation of seismic motions. 1 Introduction Grasping the spatial variable characteristics of seismic waves is crucial to predicting the safety of large scale and/or subterranean structures in case of an earthquake. Since recording earthquake motion at single locations as in the past does not provide sufficient data for accurate evaluation of such spatial variables, an array of seismometers placed both above and below the ground over a wide area is use

Keywords