A methodology for inversion of broadband seismic waveforms for elastic and anelastic structure and its application to the mantle transition zone beneath the Northwestern Pacific
A methodology for inversion of broadband seismic waveforms for elastic and anelastic structure and its application to the mantle transition zone beneath the Northwestern Pacific
复制标题
DOI：
10.1016/j.pepi.2009.10.004
复制
发表时间：
2010-06-01
影响因子：
2.3
通讯作者：
Geller, Robert J.
中科院分区：
文献类型：
--
作者：
Fuji, Nobuaki;Kawai, Kenji;Geller, Robert J.
我们开发了一种定量和客观的方法来反演弹性和非弹性结构的体波波形数据，并将其应用于西北太平洋下方的上地幔和地幔过渡带（MTZ），使用 PREM 作为起始模型。我们使用奇异值分解（SVD）作为反演的基础，并使用 Akaike 信息准则（AIC）来评估模型的统计显着性。尽管所得模型是初步的，但我们在菲律宾海板块和日本海下方的 MTZ 中获得了平均正横波速度异常。我们还在日本北部以东的俯冲带下方 300-400 公里的深度范围内及其伊豆-小笠原-马里亚纳弧下方的南部延伸处发现了负横波速度异常。与 PREM 相比，我们的反演对于所有子区域都获得了较低的 Q(mu)。 (C) 2009 Elsevier B.V. 保留所有权利。
We develop a quantitative and objective methodology for inversion of body-wave waveform data for elastic and anelastic structure and apply it to the upper mantle and mantle transition zone (MTZ) beneath the Northwestern Pacific, using PREM as the starting model. We use the singular value decomposition (SVD) as the basis for our inversion and use Akaike's Information Criterion (AIC) to evaluate the statistical significance of the models. Although the resulting models are preliminary, we obtain an average positive S-wave velocity anomaly in the MTZ beneath the Philippine Sea Plate and the Japan Sea. We also find a negative S-wave velocity anomaly in the depth range 300-400 km beneath the subduction zone to the east of northern Japan and its southern extension beneath the Izu-Bonin-Marianas arc. Our inversions obtained a lower Q(mu), as compared to PREM, for all of the subregions. (C) 2009 Elsevier B.V. All rights reserved.