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DOI | 10.1038/s41561-018-0090-z |
Repeated drainage from megathrusts during episodic slow slip | |
Nakajima, Junichi1; Uchida, Naoki2 | |
2018-05-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2018 |
卷号 | 11期号:5页码:351-+ |
文章类型 | Article |
语种 | 英语 |
国家 | Japan |
英文摘要 | Pore-fluid pressure levels are considered to regulate the frictional strength and slip behaviour at megathrusts, where the largest earthquakes on Earth occur. Some analyses have suggested that the breaking of permeability seals during megathrust earthquakes causes subsequent drainage from the megathrust. However, it is poorly understood whether drainage follows frequent occurrences of episodic slow slip events. Here we analyse seismic waveform data beneath Kanto, Japan, for the period from 2004 to 2015 and show that seismicity rates and seismic attenuation above the megathrust of the Philippine Sea slab change cyclically in response to accelerated slow slip. These observations are interpreted to represent intensive drainage during slow slip events that repeat at intervals of approximately one year and subsequent migration of fluids into the permeable overlying plate. Our observations suggest that if slow slip events occur under an impermeable overlying plate, fluids draining due to slow slip events could be forced to channel within the megathrust, potentially enhancing pore-fluid pressure at an up-dip, locked seismogenic megathrust. This process might increase the potential to trigger large earthquakes near slow slip areas. Although stress transfer is recognized as an important factor for triggering megathrust failure, fluid transfer accompanied by episodic slow slip events will thus play an additional and crucial part in megathrust weakening. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000431168900018 |
WOS关键词 | SUBDUCTION ZONE ; SOURCE PARAMETERS ; SEISMOGENIC ZONE ; FLUID-FLOW ; EARTHQUAKE ; TREMOR ; ATTENUATION ; ANTOFAGASTA ; EVENTS ; STRESS |
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/35047 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Tokyo Inst Technol, Sch Sci, Dept Earth & Planetary Sci, Tokyo, Japan; 2.Tohoku Univ, Grad Sch Sci, Res Ctr Predict Earthquakes & Volcan Erupt, Sendai, Miyagi, Japan |
推荐引用方式 GB/T 7714 | Nakajima, Junichi,Uchida, Naoki. Repeated drainage from megathrusts during episodic slow slip[J]. NATURE GEOSCIENCE,2018,11(5):351-+. |
APA | Nakajima, Junichi,&Uchida, Naoki.(2018).Repeated drainage from megathrusts during episodic slow slip.NATURE GEOSCIENCE,11(5),351-+. |
MLA | Nakajima, Junichi,et al."Repeated drainage from megathrusts during episodic slow slip".NATURE GEOSCIENCE 11.5(2018):351-+. |
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