A new catalogue of normal-mode splitting function measurements up to 10 mHz
A new catalogue of normal-mode splitting function measurements up to 10 mHz
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DOI：
10.1093/gji/ggt010
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发表时间：
2013-05-01
影响因子：
2.8
通讯作者：
van Heijst, Hendrik
中科院分区：
文献类型：
--
作者：
Deuss, Arwen;Ritsema, Jeroen;van Heijst, Hendrik
地球自由振荡谱的分裂对地幔和地核的波速和密度结构产生了重要的制约。我们提出了一组新的164个自耦合和32个交叉耦合分裂函数。它们是从过去34年（1976 - 2010）的91个M-w>= 7.4的事件的高达10 mHz的模态谱中导出的。我们的数据包括2001年6月23日秘鲁事件（M-w = 8.4），2004年苏门答腊事件（M-w = 9.0）和2005年（M-w = 8.6），2008年中国汶川事件（M-w = 7.9）和2010年智利事件（M-w = 8.8）。新的事件大大改善了数据覆盖面，特别是在大陆地区。几乎一半的分裂函数以前从未被测量过。特别是，我们测量了33个新的地幔纵波速度敏感模式，10个新的内核敏感模式和22个新的交叉耦合分裂函数。这些结果对地幔大尺度挤压构造、地幔和内核的奇度构造提供了新的约束，可用于今后的非均质地球结构反演。我们新的分裂函数系数数据集将在线提供。
The splitting of the Earth's free-oscillation spectra places important constraints on the wave speed and density structure of the Earth's mantle and core. We present a new set of 164 self-coupled and 32 cross-coupled splitting functions. They are derived from modal spectra up to 10 mHz for 91 events with M-w >= 7.4 from the last 34 yr (1976-2010). Our data include the 2001 June 23 Peru event (M-w = 8.4), the Sumatra events of 2004 (M-w = 9.0) and 2005 (M-w = 8.6), the 2008 Wenchuan, China event (M-w = 7.9) and the 2010 Chile event (M-w = 8.8). The new events provide significant improvement of data coverage particularly in continental areas. Almost half of the splitting functions have never been measured before. In particular, we measured 33 new modes sensitive to mantle compressional wave velocity, 10 new inner-core sensitive modes and 22 new cross-coupled splitting functions. These provide new constraints on the large-scale compressional structure of the mantle and the odd-degree structure of the mantle and inner core and can be used in future inversions of heterogeneous Earth structure. Our new splitting function coefficient data set will be available online.