Global Mantle Structure from Long-Period Body Waves

9628494大师们，这项研究是对地球大尺度结构定义的延续，利用长周期和宽带数字数据来约束弹性和非弹性结构。目前的重点是将分析推向更小的长度尺度，并纳入各向异性的影响。将扩大地震数据集，以提高全球覆盖范围，局部致密到区域规模研究可行的程度，并提高衰减测量的精度。从这类研究中获得的平均旅行时间也有助于开发新的一维模型和评估吸收带对旅行时间的频率依赖性的影响。将根据体波的偏振或粒子运动开发新的数据集；预计它们将对小尺度结构和各向异性敏感。将研究新的参数，使区域密度能够适应新数据集的更高分辨率。***

9628494 Masters This research is a continuation of the definition of the large- scale structure of the Earth by means of the use of long-period and broad-band digital data to constrain elastic and inelastic structure. The current emphasis is on pushing the analysis to smaller length scales and on incorporating the effects of anisotropy. Seismic data sets will be expanded to improve global coverage, locally densify to the point that regional-scale studies are viable, and improve the precision of attenuation measurements. The mean travel times obtained from such studies are also useful in the development of new one-dimensional models and in the evaluation of the effect of the absorption band on the frequency-dependence of travel times. New data sets will be developed based on the polarization or particle motion of body waves; they are expected to be sensitive to small-scale structure and anisotropy. Research will be done on new parameterizations which allow regional densification to accommodate the improved resolution of the new data sets. ***