Characteristics and origin of deep earthquake clusters beneath Northwest Pacific and Tonga subduction zone
文献类型：期刊论文
| 作者 | Hu Gui1,2; Li Juan1,2; Han GuangJie1,2 |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2019-08-01 |
| 卷号 | 62期号:8页码:3004-3016 |
| 关键词 | Deep earthquake Cluster b value Slab buckling Northwest Pacific subduction zone Tonga subduction zone |
| ISSN号 | 0001-5733 |
| DOI | 10.6038/cjg2019N0148 |
| 英文摘要 | We comparatively study the characteristics of isolated clusters of deep earthquakes in the Northwest Pacific subduction zone and Tonga region, which have different thermal parameters and subduction morphology in the earth's interior. By using Single Link Cluster method, we identify two special deep earthquake clusters G1N and G1T. The cluster GIN in NWP is located below a seismic gap, and has a low b value (similar to 0. 54), totally different from that of G1T in Tonga with a rather high b value (similar to 1. 04). Based on detailed analysis of slab morphology, seismic principal stress axes, depth distribution of deep earthquakes, as well as a comparison of seismicity around hinge zones detected in Tonga, we propose that cluster GIN is controlled by slab buckling, which might be the consequence of the resistance to subduction caused by the viscosity jump across the upper-lower mantle boundary. With the formation of convex-up folds in the slab, a local tensional stress is generated, and superimposed on the background of a compressive tectonic stress field caused by subduction, which changes the seismic activity of G1N. The feature of G1T in Tonga, however, does not show any characteristics of slab buckling. Instead, the isolated cluster belongs to a kind of outboard earthquakes, occurring on the cold but ancient Vitiza-Fiji subduction plate. This plate system had subducted to the region around G1T 5 similar to 8 Ma years ago, residing above the depth similar to 500 km, and separated from the ongoing active Tonga plate. |
| WOS关键词 | PHASE-TRANSFORMATIONS ; TRANSITION ZONE ; HIGH-PRESSURE ; SLAB ; MAGNITUDE ; LITHOSPHERE ; CATALOGS ; STRESS ; COMPLETENESS ; MECHANICS |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000480300600017 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/93331]  |
| 专题 | 地质与地球物理研究所_中国科学院地球与行星物理重点实验室 |
| 通讯作者 | Li Juan |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hu Gui,Li Juan,Han GuangJie. Characteristics and origin of deep earthquake clusters beneath Northwest Pacific and Tonga subduction zone[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2019,62(8):3004-3016. |
| APA | Hu Gui,Li Juan,&Han GuangJie.(2019).Characteristics and origin of deep earthquake clusters beneath Northwest Pacific and Tonga subduction zone.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,62(8),3004-3016. |
| MLA | Hu Gui,et al."Characteristics and origin of deep earthquake clusters beneath Northwest Pacific and Tonga subduction zone".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 62.8(2019):3004-3016. |
入库方式： OAI收割
来源：地质与地球物理研究所
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