Some implications on mantle and crustal structure from G waves and love waves
Some implications on mantle and crustal structure from G waves and love waves
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DOI：
10.1029/jz064i005p00565
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发表时间：
1959-05
影响因子：
--
通讯作者：
F. Press
中科院分区：
文献类型：
--
作者：
F. Press
大陆和海洋路径的G波速度相差不超过2%。由于G波速度受地幔低速带的控制，该低速带存在于大陆和海洋之下。这表明，在大陆和海洋之下超过50公里的深度，温度的组成和分布是相同的。低速带可能是原生玄武岩浆的源区，也是S波长周期的原因。它也可能代表壳幔相对运动的退耦带。利用长周期地震仪记录到的长传播路径的Love波，推断出大陆地壳厚度的平均值在32 ~ 37 km之间。
G-wave velocities for continental and oceanic paths do not differ by more than about 2 percent. Since the G-wave velocity is controlled by the low velocity zone in the mantle, this zone is present beneath continents and oceans. This suggests that the composition and distribution of temperature are the same for depths greater than about 50 km under continents and oceans. The low velocity zone may be the source of the primary basaltic magma and could account for the long-period nature of S waves. It may also represent a zone of decoupling for relative movements between crust and mantle. Love waves with long propagation paths recorded with long period seismographs are used to infer that the mean value of continental crustal thickness lies in the range of 32 to 37 km.