変動帯のダイナミクスは、造山運動や大規模断層帯の形成など数百万年以上かけて起きる変動から、人間・社会活動の時間スケールで生じる地震・火山活動まで、極めて広いレンジにわたる変動を対象としており、その解明には地質学・地形学・地球物理学の総合的知見が必要である。具体的には、プレート運動等に起因する応力と変動帯を構成する媒質の応答特性を時間的・空間的に把握する必要があるが、地殻応力の特定は今なお未解明の難問であり、粘弾塑性で特徴付けられる媒質特性は時間スケールや応力・温度等に複雑に依存する。さらに、流体および流体の関与する反応も媒質特性に大きな影響を与えるため、岩石学・地球化学的アプローチも必要となる。例えば、東北沖地震や能登半島地震等による顕著な地震活動や地殻変動は、上記の多様な知見や手法を総合して変動帯ダイナミクスの研究を進める上での貴重な研究対象を提供する。本セッションでは、地震学・測地学・変動地形学・構造地質学・岩石学・水文学など、変動帯ダイナミクスの解明を目指す様々な分野にわたる観察・観測・実験およびモデリング研究からの意欲的な講演、ならびに学生の萌芽的な研究の発表・議論を歓迎する。

The dynamic behaviors of mobile belts are expressed across a wide range of time scales, from the seismic and volcanic events that impact society during our lifetimes, to orogeny and the formation of large-scale fault systems which can take place over millions of years. Deformation occurs on length scales from microscopic fracture and flow to macroscopic deformation to plate-scale tectonics. To gain a physical understanding of the dynamics of mobile belts, we must determine the relationships between deformation and the driving stresses associated with plate motion and other causes, which are connected through the rheological properties of the materials. To understand the full physical system, an integration of geophysics, geomorphology, geology, petrology, and geochemistry is necessary, as is the integration of observational, theoretical and experimental approaches. In particular, rheological properties, which are physically affected by fluids in the crust and chemical reactions assisted by fluids, can be resolved only through such an interdisciplinary approach. Frequent large earthquakes, such as the 2011 Tohoku-oki, the 2016 Kumamoto, and the 2024 Noto Peninsula Earthquakes, which were accompanied by significant changes in seismic activity and crustal deformation, making present-day Japan a unique natural laboratory for the study of the dynamics of mobile belts. This session welcomes presentations from different disciplines, such as seismology, geodesy, tectonic geomorphology, structural geology, petrology, geochemistry and hydrology, as well as interdisciplinary studies, that relate to the dynamic behaviors of mobile belts.