Accuracy of the moment-tensor inversion of far-field P waves
文献类型：期刊论文
| 作者 | Kong Y4; Li M4; Chen WM(陈伟民)1,3 ; Kang BQ2
|
| 刊名 | GEOPHYSICAL JOURNAL INTERNATIONAL
 |
| 出版日期 | 2020 |
| 卷号 | 220期号:1页码:248-256 |
| ISSN号 | 0956-540X |
| 关键词 | Inverse theory Bodywaves Earthquake source observations Wave propagation |
| DOI | 10.1093/gji/ggz446 |
| 通讯作者 | Chen, Weimin(wmchen@imech.ac.cn) |
| 英文摘要 | The far-field assumption is widely used and suitable for the moment-tensor inversion in which the source-receiver distance is quite long. However, the description of far field is uncertain and an explicit far-field range is missing. In this study, the explicit far-field range is determined and the errors of moment-tensor solutions produced by the far-field approximation are analysed. The distance, for which the far-field assumption is satisfied and the effect of the near-field term can be ignored, is directionally dependent. For the shear dislocation, in the directions near the nodal lines of the far-field P waves, the far-field distance is heavily dependent on the displacement component used to invert moment tensors. The radial component of displacement, which is parallel to the wave propagation direction, is recommended for the inversion and the corresponding far-field distance is quite short. In the directions far from the nodal lines, the selection of displacement components has little influence on the far-field distance. The maximum far-field distance appears in the directions of the pressure and tensile axes of the source and the value is about 30 wavelengths of radiated waves. Using more receivers (>6) in the moment-tensor inversion can shorten the far-field distance. The effect of the near-field term on the moment-tensor inversion for tensile dislocations and isotropic sources (explosion or implosion) can be ignored. The conclusions obtained in this study are helpful for determining the positions of receivers and evaluating the accuracy of moment-tensor solutions, with far-field assumption being applied in the inversion. |
| 分类号 | 二类 |
| WOS关键词 | EARTHQUAKE SOURCE PARAMETERS ; DOUBLE-COUPLE MECHANISMS ; PERIOD SURFACE-WAVES ; NEAR-FIELD ; RAPID-DETERMINATION ; FOCAL MECHANISMS ; DEFORMATION ; CRACKS |
| 资助项目 | Strategic Priority Research Program of the Chinese Academy of Sciences[XDA22000000] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000506839900016 |
| 资助机构 | Strategic Priority Research Program of the Chinese Academy of Sciences |
| 其他责任者 | Chen, Weimin |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/81310]  |
| 专题 | 力学研究所_流固耦合系统力学重点实验室(2012-) |
| 作者单位 | 1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Technol & Engn Ctr Space Utilizat, Key Lab Space Utilizat, Beijing 100094, Peoples R China; 3.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China; 4.Beihang Univ, Sch Aeronaut Sci & Engn, Beijing 100083, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Kong Y,Li M,Chen WM,et al. Accuracy of the moment-tensor inversion of far-field P waves[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2020,220(1):248-256. |
| APA | Kong Y,Li M,陈伟民,&Kang BQ.(2020).Accuracy of the moment-tensor inversion of far-field P waves.GEOPHYSICAL JOURNAL INTERNATIONAL,220(1),248-256. |
| MLA | Kong Y,et al."Accuracy of the moment-tensor inversion of far-field P waves".GEOPHYSICAL JOURNAL INTERNATIONAL 220.1(2020):248-256. |
入库方式： OAI收割
来源：力学研究所
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