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DOI | 10.1038/s41561-017-0032-1 |
Creeping subduction zones are weaker than locked subduction zones | |
Hardebeck, Jeanne L.1; Loveless, John P.2 | |
2018 | |
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:1页码:60-+ |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Faults that are fully or partially locked pose the greatest seismic hazard because they accumulate stress that can then be released in large earthquakes. In contrast, other faults continuously creep. The creeping versus locked behaviour is probably related to the frictional properties of the fault and the effective normal stress on the fault, but it is unclear whether locked faults are weaker or stronger than creeping faults. Here we use stress orientations in subduction zones from inversion of earthquake moment tensors, and find that geodetically determined creeping versus locked behaviour is correlated with the orientation of the subduction zone plate boundary fault relative to the principal stress axes. Globally, locked subduction zones appear well-oriented for failure, assuming a typical laboratory friction coefficient. Creeping subduction zones are more poorly oriented, implying a lower apparent friction coefficient, due to either low intrinsic friction or reduced effective normal stress. The spatial variations of stress orientation on the Japan Trench are similarly correlated with spatial variations in coupling, with creeping regions having a lower apparent friction coefficient than locked regions. The absolute strength of faults is influenced by the ambient fluid pressure, which is often elevated in subduction zones. This suggests low overall strength for locked subduction zone faults, and additional strength reduction in creeping zones that may be due to transient elevated fluid pressures. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000423842000020 |
WOS关键词 | TOHOKU-OKI EARTHQUAKE ; AFTERSHOCK SEQUENCE ; SOUTHWEST JAPAN ; PORE PRESSURE ; FAULT ; STRESS ; STRENGTH ; FRICTION ; SLIP ; MEGATHRUSTS |
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/34933 |
专题 | 地球科学 气候变化 |
作者单位 | 1.US Geol Survey, 345 Middlefield Rd, Menlo Pk, CA 94025 USA; 2.Smith Coll, Northampton, MA 01063 USA |
推荐引用方式 GB/T 7714 | Hardebeck, Jeanne L.,Loveless, John P.. Creeping subduction zones are weaker than locked subduction zones[J]. NATURE GEOSCIENCE,2018,11(1):60-+. |
APA | Hardebeck, Jeanne L.,&Loveless, John P..(2018).Creeping subduction zones are weaker than locked subduction zones.NATURE GEOSCIENCE,11(1),60-+. |
MLA | Hardebeck, Jeanne L.,et al."Creeping subduction zones are weaker than locked subduction zones".NATURE GEOSCIENCE 11.1(2018):60-+. |
条目包含的文件 | 条目无相关文件。 |
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