Extraction of signal by a time series model and screening out micro earthquakes

Abstract A model for the decomposition of time series into several components is shown. In the model each component is expressed by an autoregressive model. The minimum AIC procedure for the estimation of these models is shown. The crucial problem of estimating changing variance of the model was solved by the techniques of piecewise modeling and local modeling. The extraction of micro earthquake signal was shown to exemplify the proposed procedures. The stability of the procedure and a possible simplication of the procedure were also considered by using the same data set.