Abstract
For some years seismologists and engineers have been recording and measuring microtremors. In this paper a review of earlier micotremor investigations is presented and microtremor recording apparatus developed at Auckland University Engineering School is described. Two distinct methods of recording have been developed. One uses a conventional low-cost tape recorder operating at reduced speed to record the low frequency signals. The other uses a frequency modulation methods and a high quality instrumentation tape recorder to accurately record signal levels. This paper is the first of a series of three. In the second, method of analysing microtremor records, with particular emphasis on their frequency content will be presented, while in the last of the series the application of microtremor measurement to the design of earthquake resistant structures will be critically examined.
Highlights
REVIEW OF MICROTREMOR INVESTIGATIONSThe foremost worker in microtremor investigations has been the Japanese seismologist K
There are differing views as to the form of microtremor waves
The equipment used in the frequency modulation method produces a digitised record on paper tape, suited to analysis by computer
Summary
The foremost worker in microtremor investigations has been the Japanese seismologist K. Prior to his systematic recording of microtremors at different sites, in an effort to characterize the dynamic properties of soils, little attention had been paid to recording microtremors. Studies reported by Kanai et a l ^ ' ' (5) W e r e concerned mainly with the amplitudes of vibration, in 1908, a Japanese seismologist observed that the 'average[1] period at a particular site was constant
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