Parallel LSQR algorithms used in seismic tomography
文献类型：期刊论文
| 作者 | Liu, JS; Liu, FT; Liu, J; Hao, TY |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2006-03-01 |
| 卷号 | 49期号:2页码:540-545 |
| 关键词 | seismic tomography traveltime inversion LSQR algorithms parallel computation |
| ISSN号 | 0001-5733 |
| 文献子类 | Article |
| 英文摘要 | We discuss the LSQR algorithms used in earthquake travel time tomography. We keep the epicenter terms in the equation for regional events, and then use the orthogonal projection method to eliminate the epicenter terms. For tele-events, the classic smoothing process is used. The number of non-zero elements in the partial derivative matrix is increased by several times because of the orthogonal projection and smoothing processes. For a large scale inversion problem, the amount of non-zero elements can be dozens of Gigabytes or hundreds of Gigabytes. The huge amount of memory requirement becomes the bottle neck of LSQR algorithms. To solve this problem, we have studied the distribution property of non-zero elements in the partial derivative matrix, designed an efficient data structure for the sparse matrix, used a distributed memory and computation scheme for matrix computation, and implemented it on a multi-processor super-computer. We have derived an estimation formula of parallel efficiency and tested two real tomography models. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000236382000029 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/67018]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Liu, JS |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Supercomp Ctr Comp, Network Informat Ctr, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, JS,Liu, FT,Liu, J,et al. Parallel LSQR algorithms used in seismic tomography[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2006,49(2):540-545. |
| APA | Liu, JS,Liu, FT,Liu, J,&Hao, TY.(2006).Parallel LSQR algorithms used in seismic tomography.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,49(2),540-545. |
| MLA | Liu, JS,et al."Parallel LSQR algorithms used in seismic tomography".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 49.2(2006):540-545. |
入库方式： OAI收割
来源：地质与地球物理研究所
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