スタグナントスラブに伴うマントル構造の地震学的解析と数値シミュレーション

抄録

Numerous seismological studies have presented models for the mantle structure associated with subducted slab. Variable slab behaviors revealed by recent 3D tomographic models, i. e., stagnation in the transition zone or penetration into the lower mantle before stagnation, stimulated debates as to the physical conditions to produce such different features. However, the causes of different slab behaviors yet remain unclear. While tomographic approaches are robust for visualizing the images of the Earth's deep interior, the gap between the conjecture based on large scale tomographic images and the reality of mantle property measurements in mineral physics is enormous. To reduce the gap, different approaches have been used such as regional body waveform modeling, numerical simulations of slab dynamics, or molecular dynamics simulations based on laboratory measured parameters of mantle properties. Here we review the recent development of the different approaches, and explore the issues for further studies.