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DOI | 10.1038/s41561-018-0188-3 |
Deep earthquakes in subducting slabs hosted in highly anisotropic rock fabric | |
Li, Jiaxuan1; Zheng, Yingcai1; Thomsen, Leon1; Lapen, Thomas J.1; Fang, Xinding1,2 | |
2018-09-01 | |
发表期刊 | NATURE GEOSCIENCE
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ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2018 |
卷号 | 11期号:9页码:696-+ |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Peoples R China |
英文摘要 | Analysis of deep subduction-zone earthquakes, those at depths greater than 60 km, reveals the physical and chemical properties of a descending oceanic lithosphere at mantle depths. Over the past five decades, it has been observed that a large fraction of deep earthquakes has non-double-couple (non-DC) seismic radiation patterns. In contrast, shallow earthquakes tend to have DC radiation patterns due to mechanisms of shear faulting. These observations have been used to argue that deep earthquakes rupture differently from shallow earthquakes. Here we show that the observed global distribution of non-DC deep earthquakes could be caused by shear faulting mechanisms, but in a highly anisotropic laminated rock fabric that surrounds the deep earthquakes within subducted slabs. For intermediate-depth earthquakes (similar to 60-300 km), we found a large shear-wave anisotropy of similar to 25%, possibly caused by laminated fabric or aligned melt pockets oriented parallel to the slab interface, which provides new supporting evidence for the metamorphic dehydration reactions in slabs. However, at deep-focus depths (>300 km), the putative metastable phase-change mechanism alone cannot explain the seismic anisotropy. Instead, our results and those from recent experiments suggest materials such as magnesite, or perhaps carbonatite melt, may play a role in generating deep-focus earthquakes. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000443302900019 |
WOS关键词 | DOUBLE-COUPLE COMPONENTS ; SEISMIC ANISOTROPY ; HIGH-PRESSURE ; UPPER-MANTLE ; PHASE-TRANSFORMATIONS ; INVERSION ; CONSTRAINTS ; MECHANISM ; BENEATH ; DEPTH |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/34909 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Univ Houston, Dept Earth & Atmospher Sci, Houston, TX 77004 USA; 2.South Univ Sci & Technol China, Dept Ocean Sci & Engn, Shenzhen, Guangdong, Peoples R China |
推荐引用方式 GB/T 7714 | Li, Jiaxuan,Zheng, Yingcai,Thomsen, Leon,et al. Deep earthquakes in subducting slabs hosted in highly anisotropic rock fabric[J]. NATURE GEOSCIENCE,2018,11(9):696-+. |
APA | Li, Jiaxuan,Zheng, Yingcai,Thomsen, Leon,Lapen, Thomas J.,&Fang, Xinding.(2018).Deep earthquakes in subducting slabs hosted in highly anisotropic rock fabric.NATURE GEOSCIENCE,11(9),696-+. |
MLA | Li, Jiaxuan,et al."Deep earthquakes in subducting slabs hosted in highly anisotropic rock fabric".NATURE GEOSCIENCE 11.9(2018):696-+. |
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