Study of Anomalous Wavetrains Associated with Long-Period Spheroidal Mode Overtones

这是一个研究与长周期球面模态泛音相关的异常波形的新项目的建议。建议的项目包括：(A)利用全球数字地震网（GDSN）和GEOSCOPE记录观测异常波形。我们将使用堆叠技术（UC轮廓）来分离模式并检查粒子运动跟踪以识别异常。由路径效应引起的异常波的数据集的汇编是必要的。(B)路径相关色散关系分析。我们对异常表面波泛音的初步研究表明，这个问题在空间上依赖于路径。在这种情况下，局部色散关系不能决定波的模态。相反，我们应该考虑一个表达式，该表达式依赖于整个波传播范围内的模态属性，因此我们可以使用结果来构建系统的总体特征值。(C)通过工作站网络进行协作。我们提出的表面波传播的研究需要对地球结构的了解，这也可以通过构造、大地测量和地质研究来提供。我们将通过工作站网络与不同领域的科学家交流有关地球结构的数据、信息和想法。

This is a proposal for a new project in which is studied anomalous wavetrains associated with long-period spheroidal mode overtones. The proposed projects include: (A) Observation of anomalous wavetrains using Global Digital Seismograph Network (GDSN) and GEOSCOPE records. We will use a stacking technique (UC contours) to separate modes and examine particle motion tracings to identify anomalies. A compilation of data sets of anomalous wavetrains caused by the path effects is essential. (B) Analysis of path-dependent dispersion relations. Our preliminary study of anomalous surface wave overtones indicates that this problem is spatially dependent on the path. In this case the local dispersion relation does not determine the modes of waves. Instead we should consider an expression that depends on the properties of the mode over its entire range of wave propagation, so we can use the results to construct the overall eigenvalues for the system. (C) Collaboration through a work station network. Our proposed study of surface wave propagation requires a knowledge of the earth's structure which may also be supplied by tectonic, geodetic and geological studies. We will exchange data, information and ideas related to the earth's structure with scientists in different fields through a work station network.