Abstract
The parameters describing the state of the geological medium include its response to the continuous external impacts, which characterizes the structure of the medium and the stresses accumulated in it. In the present paper, through analyzing the long time series of the volumetric strain monitoring data in the nearsurface crustal layer, which were obtained by the American geophysicists under the Plate Boundary Observatory (PBO) project within the Parkfield segment of the San Andreas fault, the time behavior of the volumetric strain response to the separate components of the tides and the air pressure impacts is considered.
The analysis of the response regime at the different observational stations suggests a significant influence of the local structural features and tectonic processes at the considered sites of the volumetric strain observations. The estimate of the variations in the partial information from the individual observations (values) is used for improving the reliability of identifying the amplitude peculiarities of the response when synchronizing the variations of the set of the tidal components. It is established that at the PKDLT observation point, a synchronous increase in the transfer coefficient of the tidal impact of the M 2, O 1, and L 2 components two years before the Parkfield earthquake of 2004 took place.
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Original Russian Text © A.S. Cherepantsev, 2016, published in Fizika Zemli, 2016, No. 4, pp. 125–140.
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Cherepantsev, A.S. The time variations in the parameters of the volumetric strain response to the tidal and baric impacts. Izv., Phys. Solid Earth 52, 590–605 (2016). https://doi.org/10.1134/S1069351316030010
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DOI: https://doi.org/10.1134/S1069351316030010