The resolution of whole Earth seismic tomographic models
The resolution of whole Earth seismic tomographic models
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DOI：
10.1111/j.1365-246x.2005.02551.x
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发表时间：
2005-04
影响因子：
2.8
通讯作者：
G. Soldati;L. Boschi
中科院分区：
文献类型：
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作者：
G. Soldati;L. Boschi
我们用国际地震中心(ISC)的纵波走时数据对整个地球结构的分辨率进行了评估；我们使用的分辨率度量是由模型分辨率矩阵的直接计算提供的，比通过合成/棋盘测试获得的传统的分辨率度量更严格(计算成本也更低)。我们的工作完成了Boschi(2003)的引导性研究，其中只考虑了用非常简单的正则化方案导出的地幔模型。在这里，我们扩展了Boschi的数据库，测量了被地球核幔边界(CMB)和地核反射或折射的纵波。与Soldati等人的工作类似。(2003)，我们将CMB地形和不均匀的外核结构作为反演的自由参数；通过分析模型分辨率矩阵，我们试图解释由地震波映射的地球深部结构与由核折射绘制的地球深部结构之间的已知差异。
SUMMARY We evaluate the resolution of whole Earth structure achieved by compressional wave traveltime data from the International Seismological Centre (ISC); the measure of resolution we employ, provided by the direct calculation of the model resolution matrix, is more rigorous than the traditional (and computationally cheaper) one obtained through synthetic/checkerboard tests. Our work completes the introductive study of Boschi (2003), where only mantle models derived with a very simple regularization scheme were considered. Here, we expand Boschi's database with measurements of compressional waves reflected by, or refracted through, the Earth's core–mantle boundary (CMB) and core. In analogy with the work of Soldati et al. (2003), we treat CMB topography and heterogeneous outer core structure as free parameters of our inversions; analysing model resolution matrices, we attempt to explain the known discrepancy between deep Earth structure mapped by seismic waves reflected and refracted by the core.