Density‐versus‐depth models from multimode surface waves
Density‐versus‐depth models from multimode surface waves
复制标题
多模表面波的密度与深度模型
DOI：
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发表时间：
1984
期刊：
影响因子：
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通讯作者：
V. Maupin
中科院分区：
文献类型：
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作者：
M. Cara;J. Lévêque;V. Maupin
与太平洋和北美有关的多模洛夫波和瑞利波数据使用两组参数进行反演：1)各向同性P和S速度加上密度；2)描述横向各向同性介质的五个弹性参数加上密度。发现各向同性假设下得到的上地幔模型非常不真实，而横向各向同性假设下得到的上地幔模型更为真实。太平洋和北美之间的横向密度变化小于1.5%，在这两个地区，在360 km附近的深度可以很好地解决大的密度梯度。
Multimode Love and Rayleigh wave data related to the Pacific Ocean and to North America are inverted using two sets of parameters: 1) the isotropic P and S velocities plus the density and 2), five elastic parameters describing a transversely isotropic medium, plus the density. It is found that the assumption of isotropy leads to very unrealistic upper-mantle models while much more realistic models are obtained under the assumption of transverse isotropy. The lateral variations in density between the Pacific Ocean and North America are then less than 1.5% and, in both regions, a large density gradient is well resolved at a depth near 360 km.