Secular changes in global geodynamic parameters (polar motion excitation, length of day, and J₂, etc.) are significant to understand internal mass transport in the solid Earth system and surface geophysical fluids related to global climate. However, the glacial isostatic adjustment (GIA) and climate-driven surface mass redistribution are insufficient to explain the origin. We are motivated to report the significance of seismic effect in the pursuit of understanding the budget of secular changes in geodynamic parameters. The seismic effect is comparable to the GIA effect and amounts to 20% or larger (up to 30%) of the observed secular changes in global geodynamic parameters. Therefore, the seismic effect must be treated as one key mechanism of driving secular changes in geodynamic parameters, which is critical to invert rheological structure, clarify internal dynamic processes, and reveal the physical evolution of the Earth.

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地震对全球地球动力学参数长期变化的贡献

全球地球动力学参数的长期变化（极地运动激励、日长和J ₂等）对于了解与全球气候相关的固体地球系统中的内部质量传输和地表地球物理流体具有重要意义。然而，冰川均衡调整（GIA）和气候驱动的地表质量重新分布不足以解释起源。我们有动力报告地震效应在寻求理解地球动力学参数长期变化的预算方面的重要性。地震效应与 GIA 效应相当，相当于观测到的全球地球动力学参数长期变化的 20% 或更大（高达 30%）。因此，必须将地震效应作为驱动地球动力学参数长期变化的关键机制之一，对反演流变结构、阐明内部动力过程、揭示地球物理演化至关重要。