Time series of coordinates of permanent GPS stations are expected to exhibit a steady, linear trend in response to tectonic forces. This trend is, in fact, observed, but it is accompanied by variety of signatures, so that the overall spectral properties of the detrended, zero-mean time series differ from that of a random signal, especially in the medium (~~fraction of a year) to long (several years) period.The time series of the coordinates of 30 permanent GPS stations in the Alpine Mediterranean area with time spans from one to five years are presented.
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The area bounded by the Alpine chain to the North and Mediterranean/Ionian sea to the South is characterized by a wide range of tectonic phenomena, such as the identation of the Adria block into the Eastern Alp, lateral extrusion of the Tauern Window, unbending of the Adriatic lithosphere, opening of the Thyrrenian sea and subduction of the Ionian lithosphere beneath the Calabrian arc. This ongoing tectonics is accompanied by a relatively intense volcanism and seismicity, which justify the expectation of small but measurable horizontal and vertical displacements.
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