We have developed a scaled analog model of a subduction zone simulating seismic cycle deformation phases. Its rheology is based on multilayered visco‐elasto‐plastic materials to account for the mechanical behavior of a continental lithospheric plate overriding a subducting oceanic plate. The seismogenic zone displays unstable slip behavior, extending at depth into a weak interface with stable slip properties. The model succeeds in reproducing interseismic phases interrupted by coseismic ruptures and followed by after‐slip. The experimental data catalog shows a broad variability of slip events from aseismic slow slips to fast dynamic lab quakes. Results also show the occurrence of both isolated and precursory slow‐slip events arising before the mainshocks. Given the absence of fluids in the model, the broad variability in slip event velocity can be attributed to fault roughness complexity. The model rheology induces also a key visco‐elastic coupling between the elastic overriding plate and the mantle wedge allowing, for the first time, to reproduce experimentally a realistic postseismic visco‐elastic relaxation phase. Preliminary results reveal that the tectonic loading rate modulates this visco‐elastic coupling. A low loading rate weakens it, which increase the amount of storable interseismic elastic deformation, and favors the occurrence of large megathrust events. A high loading rate strengthens it, which minimize the accumulation of interseismic elastic deformation, the slip‐event sizes, and promote aseismic creep. This new scaled‐analog subduction model is a complementary tool to investigate earthquake mechanics and improve the interpretation of geodetic and seismological records.

中文翻译：

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整合地壳-地幔粘弹性耦合的多层模拟模型的研究，以研究俯冲超推力地震周期

我们已经开发了一个模拟地震周期变形阶段的俯冲带比例模拟模型。其流变学基于多层粘弹塑性材料，以解释覆盖俯冲洋性板块的大陆岩石圈板块的力学行为。地震区显示出不稳定的滑动行为，在深度上延伸到具有稳定滑动特性的弱界面。该模型成功地再现了由于同震破裂而中断并随后发生滑移的震相。实验数据目录显示，滑移事件的变化很大，从抗震慢滑到快速动态实验室地震。结果还表明，在主震发生之前，既发生过独立的滑坡事件又发生了先发生的缓慢滑坡事件。由于模型中没有流体，滑动事件速度的广泛变化可归因于断层粗糙度的复杂性。模型的流变学还引起了弹性上覆板和地幔楔之间的关键粘弹性耦合，这首次使实验再现了现实的地震后粘弹性松弛阶段。初步结果表明，构造加载速率调节了这种粘弹性耦合。较低的加载速率会削弱它，从而增加可存储的地震间弹性变形的数量，并有利于发生大的特大推力事件。高加载速率会增强它，从而最大程度地减少了地震间弹性变形的累积，滑移事件的大小并促进了地震蠕变。