Abstract
In situ observations and laboratory experiments showed that slow deformation waves widely exist in geomedia under loading conditions. Slow deformation waves’ behavior exhibits some similarities in media ranging from the scale as large as the Earth’s crust to the scale as small as the laboratory test samples. However, the mechanism underlying their generation has not been clarified yet. In this research an experimental study was performed on small-scale red sandstone samples subjected to uniaxial compression at the displacement rates of 0.1, 0.5, and 1 mm/min. Slow deformation waves under different loading rates were analyzed by speckle photography for microscopic characterization combined with the digital image correlation (DIC) technique. The Luders deformation bands were predominantly observed in the flow channels formed at the stage of macro-elastic deformation. The spatial-temporal heterogeneity of the rock sample surface was quantified, and the deformation waves’ propagation velocities under different loading rates were obtained. The linear relationship between the propagation velocities of slow deformation waves and the loading rates was determined. The research findings shed some new light on the evolutionary characteristics of the slow deformation waves.
Highlights
In situ observations showed that slow deformation waves with propagation velocities much lower than those of transverse and longitudinal waves generated by earthquakes exist in Earth’s crust
Studies on the plastic flow network and plastic flow waves of the continental lithosphere [5,6] have shown that the driving force at the margin of the continental plate is transmitted over a long distance, primarily through the networklike flow and slow deformation waves in the lower lithosphere, including the lower crust and lithospheric mantle
Rock samples were subjected to microscopic characterization by speckle photography during the uniaxial compression test
Summary
In situ observations showed that slow deformation waves with propagation velocities much lower than those of transverse and longitudinal waves generated by earthquakes exist in Earth’s crust. Studies on the plastic flow network and plastic flow waves of the continental lithosphere [5,6] have shown that the driving force at the margin of the continental plate is transmitted over a long distance, primarily through the networklike flow and slow deformation waves in the lower lithosphere, including the lower crust and lithospheric mantle. This driving force controls the intraplate deformation and seismic activities. Under the Indian plate’s pushing effect, the deformation flow waves with different quasi-periodicity are present in the central and eastern Asian continent, such as ten-year and one-hundred-year period waves
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