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DOI | 10.1038/s41467-019-11912-4 |
Sporadic low-velocity volumes spatially correlate with shallow very low frequency earthquake clusters | |
Tonegawa, Takashi1; Araki, Eiichiro1; Kimura, Toshinori1; Nakamura, Takeshi2; Nakano, Masaru1; Suzuki, Kensuke1 | |
2019-08-27 | |
发表期刊 | NATURE COMMUNICATIONS |
ISSN | 2041-1723 |
出版年 | 2017 |
卷号 | 8 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan |
英文摘要 | A low-velocity zone (LVZ) has been detected by seismic exploration surveys within the Nankai accretionary prism toe off the Kii Peninsula, southwestern Japan, and is considered to be a mechanically weak volume at depth. Such mechanical heterogeneities potentially influence seismic and tsunamigenic slips on megathrust earthquakes in the subduction zone. However, the spatial distribution of the LVZ along the trough-parallel direction is still elusive. Here we show sporadic LVZs in the prism toe from one-dimensional shear wave velocity (Vs) profiles obtained at 49 cabled ocean bottom stations, which were estimated by a nonlinear inversion technique, simulated annealing, using the displacement-pressure ratios of the Rayleigh wave. The estimated distribution of LVZs along the trough widely correlates with the epicentres of shallow very low frequency earthquakes (sVLFEs), which suggests that sVLFEs are activated in the sporadically distributed low-velocity and mechanically weak volumes where fluids significantly reduce the shear strength of faults. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000417649500024 |
WOS关键词 | SPLAY FAULT SYSTEM ; AZIMUTHAL ANISOTROPY ; SUBDUCTION ZONE ; SLOW SLIP ; SEA-FLOOR ; ASTHENOSPHERE ; LITHOSPHERE ; PRESSURE ; OFFSHORE ; RECORDS |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
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/204513 |
专题 | 资源环境科学 |
作者单位 | 1.Japan Agcy Marine Earth Sci & Technol, 2-15 Natsushima, Yokosuka, Kanagawa 2370061, Japan; 2.Natl Res Inst Earth Sci & Disaster Resilience, 3-1 Tennodai, Tsukuba, Ibaraki 3050006, Japan |
推荐引用方式 GB/T 7714 | Tonegawa, Takashi,Araki, Eiichiro,Kimura, Toshinori,et al. Sporadic low-velocity volumes spatially correlate with shallow very low frequency earthquake clusters[J]. NATURE COMMUNICATIONS,2019,8. |
APA | Tonegawa, Takashi,Araki, Eiichiro,Kimura, Toshinori,Nakamura, Takeshi,Nakano, Masaru,&Suzuki, Kensuke.(2019).Sporadic low-velocity volumes spatially correlate with shallow very low frequency earthquake clusters.NATURE COMMUNICATIONS,8. |
MLA | Tonegawa, Takashi,et al."Sporadic low-velocity volumes spatially correlate with shallow very low frequency earthquake clusters".NATURE COMMUNICATIONS 8(2019). |
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