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(a–d) The decomposed signals at LHAZ and (e–h) at KUNM GPS stations as IMF7 and IMF8 correspondent their phases; (a,e) are the spectrum of original GPS time series; (b,f) are the phase of annual and quasi-biennial signals; (c,g) are amplitude spectrum of annual signal; (d,h) are amplitude spectrum of quasi-biennial signal.
