Low-Frequency Attenuation in Microstructurally Equilibrated Silicate Partial Melts

9220603 Cooper对微晶玻璃和合成（Co-Mg）橄榄岩-玄武岩部分熔体聚集体的弯曲蠕变和衰减实验表明，三到四种不同的非弹性损失（衰减）机制。这些损耗相互作用在空间中产生衰减“带”。如果了解这些损失的性质，就可以为认识与部分融化有关的独特衰减效应奠定明确的基础。因此，将对准平衡部分熔融对多晶硅酸盐衰减行为的影响进行实验研究。地震到次地震频率实验将以剪切（往复扭转）和杨氏模量（往复弯曲）两种格式进行，以便隔离稳态熔体形态对S波和P波衰减的影响。该实验将应用于橄榄石、橄榄石+（橄榄石饱和）拉斑玄武岩和铝硅酸盐玻璃陶瓷的合成聚集体。＊＊＊

9220603 Cooper Flexural creep and attenuation experiments on glass-ceramics and synthetic (Co-Mg) olivine-basalt partial-melt aggregates indicate three-to-four distinct anelastic loss (attenuation) mechanisms. These losses interact to produce an attenuation "band" in space. The nature of these losses, if understood, could form an unequivocal foundation for recognizing the attenuation effects(s) uniquely associated with partial melting. Therefore, an experimental investigation of the effects of quasiequilibrated partial melting on the attenuation behavior of polycrystalline silicates will be done. Seismic-to-subseismic frequency experiments will be performed in both shear (reciprocating torsion) and Young's modulus (reciprocating flexure) formats in order to isolate the effects of a steady-state melt morphology on S- and P- wave attenuation. The experiments will be applied to synthetic aggregates of olivine, olivine-plus-(olivine-saturated) tholeiite basalt and aluminosilicate glass-ceramics. ***