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Time Changes of Transfer Functions at Kakioka Related to Earthquake Occurrences ( I )
A study on transfer functions at Kakioka has been carried out in order to investigate their interesting time changes related to neighbouring earthquake occurrences. Transfer functions for various period components have been obtained as frequently as possible since July， 1976 using the every minute sampling data by the optical pumping magnetometer system (KASMMER). A very fine resolution on analysis of the transfer functions is aimed by this study.
As a preliminary result of the study，it is found out from various analyses of the data during the period roughly from 1976 to 1978 that there may exist some precursory changes of the transfer functions related to large and near earthquakes. Such interesting results are c1early confirmed as “mean earthquake time changes" by statistical analyses of many remarkable earthquakes.
On the other hand，in individual cases，the time changes of transfer functions estimated by various running averages indicate so complicated features that it is difficult to regard all of them as a natural confident change，partly because of some error components. However，time changes likely to correlate with some remarkable earthquakes near Kakioka are to a certain degree confirmed in many cases. Besides，it is also found out that the transfer functions seem to have a complicated magnetic activity dependence and a certain systematic error component.
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