Dynamic variation of S-wave Q value beneath Sichuan-Yunnan, China
文献类型：SCI/SSCI论文
| 作者 | Pei S. P. ; Liu J. ; Ma H. S. ; Gao X. ; Su J. R. |
| 发表日期 | 2010 |
| 关键词 | Sichuan and Yunnan S-wave Amplitude tomography Q value variation adjacent regions saturated rocks seismic-waves attenuation tomography earthquakes mechanisms inversion japan crust |
| 英文摘要 | Variation of Q value can provide the information of crustal stress, rock cracks, and fluid variation, and evidence to understand preparation and generation of earthquake. In this study, the the amplitude data from the Annual Bulletin of Chinese Earthquake and the provincial earthquake bulletins of Sichuan and Yunnan were tentatively divided into 6 time segments. Tomographic M, amplitude method has been applied for each time segment to obtain temporal Q value variations. Firstly, a representative time segment with more than 14000 ray paths was selected to estimate the resolution and error of tomographic attenuation structure by adding random noise to original data and bootstrap method. Then, based on the detailed analysis of reliability, the same tomographic method with the same parameters was applied for all time segments. The research result shows that (1) the imaging error is small from the observation error of original data and ignoring radiation pattern of earthquake source. The error is less than 6% if 40% random noise is added to the original data. (2) The bootstrap method shows that the maximal error is less than 8% of average Q value, that means the tomographic results are stable and reliable because of huge data set in Sichuan and Yunnan region. (3) In checkerboard test, the resolution can reach 20' for the region with more than 50 ray paths in each cell. (4) The Q value variations were obtained after imaging for each time segment. A clear positive relation was found between the average Q value for each time segment and the number of middle and large earthquakes, in other words, the more earthquakes, the larger average Q, that may be resulted from the changes of regional stress. The relation between earthquake distribution and Q value variation was analyzed and we found that most of the large earthquakes did not occur in the maximal variation region of Q, but in the transition zone between maximal increase and drop of Q value. Maybe the differential stress has a maximal change in transition zone and the earthquake is easier to trigger. |
| 出处 | Chinese Journal of Geophysics-Chinese Edition |
| 卷 | 53 |
| 期 | 7 |
| 页 | 1639-1652 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0001-5733 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/23226]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Pei S. P.,Liu J.,Ma H. S.,et al. Dynamic variation of S-wave Q value beneath Sichuan-Yunnan, China. 2010. |
入库方式： OAI收割
来源：地理科学与资源研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。