CSEDI: Experimental, Seismological, and Modeling Study of the Rheology, Structure, and State of Stress of Deep Subducting Slabs

[96 . 079]休斯敦：美国科学院提出对深地震的性质进行跨学科的研究。本研究将检验在俯冲岩石圈板块中伴随橄榄石到尖晶石亚稳相变的转换诱发断裂机制的有效性。实验室微观结构和流变学实验和地震学研究将继续进行，并将通过实验室（变形引起的不稳定的微观力学模型）和地球尺度（大尺度热学和力学模型）的地球动力学模型研究得到加强。了解深震破坏机制，对于确定俯冲板块内部矿物学结构，识别地幔对流驱动力具有重要意义。＊＊＊

96-01979 Houston The PIs propose an interdisciplinary study of the nature of deep earthquakes. This research will test the validity of the proposed mechanism of transformation-induced faulting that accompanies the metastable phase change from olivine to spinel in subducting lithospheric slabs. Laboratory microstructural and rheological experiments and seismological studies will be continued and will be enhanced by geodynamic modeling studies at both laboratory (micromechanical modeling of the transformation-induced instability) and earth scales (large-scale thermal and mechanical modeling). Understanding the failure mechanism of deep earthquakes is important for determining the internal mineralogical structure of subducting slabs and identifying the driving forces for convection in the earth's mantle. ***