期刊
GEOPHYSICAL RESEARCH LETTERS
卷 31, 期 15, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2004GL020351
关键词
-
We measure P wave spectral amplitude ratios from deep-focus earthquakes recorded at broadband seismic stations of the Tanzania network to estimate regional variation of sublithospheric mantle attenuation beneath the Tanzania craton and the eastern branch of the East African Rift. One-dimensional profiles of Q(P) adequately explain the systematic variation of P wave attenuation in the sublithospheric upper mantle: Q(P) similar to 175 beneath the cratonic lithosphere, while it is similar to 80 beneath the rifted lithosphere. By combining the Q(P) values and a model of P wave velocity perturbations, we estimate that the temperature beneath the rifted lithosphere (100-400 km depth) is 140-280 K higher than ambient mantle temperatures, consistent with the observation that the 410 km discontinuity in this region is depressed by 30-40 km.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据