Analysis of Antarctic Broad Band PASSCAL Data for Surface Wave Dispersion

该奖项支持一项利用便携式地震仪从南极大陆内部收集和分析宽带远震数据的技术可行性研究。南极西部冰原覆盖在南极大陆的一个区域上，该区域可能处于延伸状态。然而，实际上我们对地壳和上地幔的地震结构所知甚少。为被动远震研究部署便携式宽带地震仪可能是获取该大陆深部结构数据的最有效手段。作为ICEQUAKE台网的增强型设备，部署在南极洲中西部的宽带pascal地震仪收集的数据代表了在五周内记录的几个明确的远震事件（约10-20次事件）的有用记录。这些数据具有足够的质量，可以对周期低至50秒的基本模色散曲线进行估计，并对边界相互作用和旅行时间异常的体相进行分析。这将提供下至约200公里深度的地壳和上地幔剪切速度结构的一级约束。此外，这些数据包含了足够的信息来建立冰盖的环境噪声模型。因此，如果成功，这项工作将为开发地震研究的重要实验资源所需的技术设计要素提供重要指导，这可能导致在了解南极大陆方面取得重大进展。

Abstract This award supports a study of the technical feasibility of collecting and analyzing broad-band teleseismic data from the Antarctic continental interior using portable seismometers. The West Antarctic Ice Sheet overlies a region of the Antarctic continent which may be in extension. However, very little is actually known about the seismic structure of the crust and upper mantle. The deployment of portable broad-band seismometers for passive teleseismic studies may offer the most effective means of acquiring data on the deep structure of this continent. Data collected with broad-band PASSCAL seismometers deployed as an augmentation to the ICEQUAKE network in central West Antarctica represents useful records with several well defined teleseismic events (about 10-20 events) that were recorded over a period of five weeks. The data are of sufficient quality to allow the estimation of fundamental mode dispersion curves down to periods as low as 50 seconds, and the analysis of body phases for boundary interactions and travel time anomalies. This should provide first-order constraints on the shear velocity structure of the crust and upper mantle down to a depth of approximately 200 km. Additionally, the data contain sufficient information to develop ambient noise models for ice sheets. Consequently, if successful, this work will lead to important guidance for the technical design elements necessary for developing an important experimental resource for seismic studies that may lead to significant advances in understanding the Antarctic continent.