Regional Studies of Anisotropy Beneath the Pacific Ocean

近年来的几项研究证实， 大洋区地壳和上地幔各向异性， 它们的弹性。 我们建议研究其性质， 通过比较记录的观测波形来观察各向异性 区域和近距离与模型计算的 广义各向异性，可包括多达13个弹性 常数，并且可以在幅度上从层到层变化， 方向 通过将我们的观测限制在具有 短距离行驶，我们将尽量减少横向的任何影响， 速度结构在波形上的不均匀性， 各向异性的方向和大小的可能性 沿该路径沿着均匀，并且，如果 可能能够分离不同的影响， 上地壳、下地壳和上地壳的各向异性结构 地幔 此外，由于使用了短路径， 可以使用小事件，这是众多的许多部分， 太平洋地区

Several studies in recent years have confirmed that both the crust and upper mantle beneath oceanic regions are anisotropic in their elastic properties. We propose to study the nature of that anisotropy by comparisons of observed waveforms recorded at regional and near distances with those calculated for models of generalized anisotropy which can include up to 13 eleastic constants and which can vary from layer to layer in magnitude and direction. By restricting our observations to waves which have traveled short distances we will minimize any effects of lateral heterogeneity of velocity structure on wave forms, increase the likelihood that the orientation and magnitude of anisotropy is uniform along that path, and, if paths of different distances are available, may be able to separate the effects of varying anisotropic structure in the upper crust, lower crust, and upper mantle. In addition, since short paths are used, it will be possible to use small events which are numerous in many parts of the Pacific.