Imaging Upper Mantle Fine Structure with Triplicated Multiple-S and WKM Synthetics

9973191墨尔本本项目拟采用新的体波形建模工具对北美边缘附近的上地幔精细尺度构造变化进行成像。第二个目标是根据合成物评估层析速度模型的准确性。模拟的相位将是来自东太平洋隆起、阿拉斯加湾和阿留申群岛事件的宽带、三倍直接s波形和多重s波形。对于这些源，该数组提供了单个源记录段，其中包含可识别的三倍S及其倍数的相位移动。这项工作的核心技术包括最近开发的适用于三维层析模型的射线算法，该算法源自WKBJ方法。该方法将通过模拟三次S相，系统地考察北美西缘的上地幔和过渡带结构。

9973191MelbourneThis project proposes to employ new body waveform modeling tools to image fine scale upper mantle structural variations near the North American margin. A secondary goal is to assess the accuracy of tomographic velocity models in terms of the synthetics they produce. The phases modeled will be broadband, triplicated direct- and multiple-S waveforms from events along the East Pacific Rise, Gulf of Alaska, and Aleutians. For these sources, the array provides a single source record sections with identifiable phase moveout of triplicated S and its multiples. The centerpiece technology of this work includes a recently developed ray algorithm applicable to 3D tomographic models which is derived from the WKBJ method. This method will be used to systematically examine upper-mantle and transition-zone structure along the western margin of North America by modeling triplicated S phases.