Abstract:
The Earth’s tectonic evolution involves immense spatial and temporal scales, posing fundamental challenges for direct observation of its dynamic mechanisms. Analog modeling of tectonic processes provides a key approach for quantitative analysis in the laboratory by constructing scaled models that satisfy similarity principles. However, conventional normal-gravity analog modeling is limited by insufficient self-weight stress of the model and scale effects of material strength, making it difficult to faithfully reproduce the stress state and long-term evolution of deep geological environments. Hypergravity tectonic analog modeling has emerged as a solution to these limitations. By using a centrifuge to generate a high-gravity field, this method achieves stress equivalence between the scaled model and the natural prototype, while the “time-scaling effect” significantly accelerates slow geological flow processes. This paper systematically reviews the development and application of hypergravity analog modeling. It first outlines the similarity theory and the inherent limitations of normal-gravity experiments. It then focuses on the core principles of hypergravity experiments: by increasing the body force field, it becomes possible to use materials with higher strength and a wider rheological spectrum, thereby constructing more realistic models and enabling non-destructive, successive observations of progressive deformation. The article reviews in detail the application of hypergravity technology in key tectonic fields, including plate subduction initiation, fold-and-thrust belt formation, regional extensional tectonics, and evaporite/magmatic diapirism. It highlights unique insights gained from hypergravity simulations that are difficult to obtain from normal-gravity experiments, such as the rotation mechanism of low-angle subduction, the evolution of detachment faults, the driving mechanisms of salt tectonics, and the behavior of deep ductile flow. Compared with normal-gravity simulations, the core advantages of hypergravity modeling are: accurate matching of the stress field, effective compression of experimental time, compatibility with materials having widely varying rheological properties, and detailed quantitative characterization of deformation processes. Although hypergravity simulations have achieved substantial results using drum centrifuges, the potential of large-scale models in beam centrifuges remains to be further explored. Looking forward, the deep integration of hypergravity technology with modern observation techniques such as Particle Image Velocimetry (PIV), Digital Image Correlation (DIC), and X-ray Computed Tomography (CT) will greatly enhance the spatial resolution and quantitative analysis dimensions of experimental data. Hypergravity tectonic analog modeling will continue to provide irreplaceable experimental constraints on major frontier geological problems, including plate interaction, three-dimensional evolution of orogenic belts, and deep material cycling, thereby driving innovation in geodynamic theory.