Joint inversion of P-wave velocity and Vp-Vs ratio: imaging the deep structure in NE Japan
文献类型：期刊论文
| 作者 | Zhi, W |
| 刊名 | APPLIED GEOPHYSICS
 |
| 出版日期 | 2014 |
| 卷号 | 11期号:2页码:119-127 |
| 关键词 | Seismic tomography P and S source-receiver pairs Pacific subduction zone Mantle wedge |
| ISSN号 | 1672-7975 |
| 中文摘要 | A new inversion scheme is presented to obtain three-dimensional images of P-wave velocity (Vp) and P S-wave velocity ratio (Vp/Vs) using P- and S-phase pairs, i.e., the same source receiver pairs for the P- and S-wave arrival-time data. The S-wave velocity (Vs) was separately inverted using the S-phase arrival times. The earthquake hypocenters were simultaneously relocated in the joint inversion. The method considers the Vp/Vs anomaly as a model parameter in the inversion. The proposed method thus provides a more robust calculation of the Vp/Vs anomaly than the conventional method of dividing Vp by Vs. The method also takes into account the ray path difference between P- and S-waves, and hence yields a less biased Vp Vs ratio than the method of inverting S P-wave data for Vp and Vp/Vs anomalies under the assumption of identical P and S ray paths. The proposed method was used to image the crust and upper mantle in northeastern (NE) Japan taking advantage of a large number of high-quality arrival times of P- and S-wave source receiver pairs. The inverted structures suggest that the subducting slab of the Pacific plate is an inclined zone of high-Vp and Vs anomalies with low Vp/Vs perturbation. The mantle wedge is characterized by low-Vp, low-Vs, and high-Vp/Vs anomalies at shallow depths beneath active volcanoes. These features are also observed at greater depths in the back-arc region. Although these features have been previously reported, the Vp/Vs anomaly pattern obtained in this study shows much less scatter and is much better correlated with the seismic velocity perturbation patterns than previous studies. The proposed method can be used, in conjunction with velocity anomaly patterns, to quantify thermal processes associated with plate subduction. |
| 学科主题 | Geochemistry & Geophysics |
| 收录类别 | SCI |
| 资助信息 | Chinese Academy of Sciences [17314059]; Natural Science Foundation of China [41372229]; Sichuan Province Outstanding Youth Foundation [2010JQ0033. KYTD201002]; State Key Laboratory of Geohazard Prevention and Geoenvironment Protection; Research Foundation for the Doctoral Program of Higher Education of China [20115122110007, 20125122110002] |
| 原文出处 | SPRINGER |
| WOS记录号 | WOS:000339307200001 |
| 公开日期 | 2014-12-11 |
| 源URL | [http://ir.scsio.ac.cn/handle/344004/10620]  |
| 专题 | 南海海洋研究所_中科院边缘海地质重点实验室 |
| 推荐引用方式 GB/T 7714 | Zhi, W. Joint inversion of P-wave velocity and Vp-Vs ratio: imaging the deep structure in NE Japan[J]. APPLIED GEOPHYSICS,2014,11(2):119-127. |
| APA | Zhi, W.(2014).Joint inversion of P-wave velocity and Vp-Vs ratio: imaging the deep structure in NE Japan.APPLIED GEOPHYSICS,11(2),119-127. |
| MLA | Zhi, W."Joint inversion of P-wave velocity and Vp-Vs ratio: imaging the deep structure in NE Japan".APPLIED GEOPHYSICS 11.2(2014):119-127. |
入库方式： OAI收割
来源：南海海洋研究所
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