DOI: 10.1016/j.epsl.2017.10.062
Scopus记录号: 2-s2.0-85034983933
论文题名: Distribution of very low frequency earthquakes in the Nankai accretionary prism influenced by a subducting-ridge
作者: Toh A. ; Obana K. ; Araki E.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 482 起始页码: 342
结束页码: 356
语种: 英语
英文关键词: accretionary prism
; broadband ocean bottom seismometer
; hierarchal clustering analyses
; Nankai trough
; tremor
; very low frequency earthquake
Scopus关键词: Faulting
; Geophysics
; Plates (structural components)
; Prisms
; Seismographs
; Seismology
; Shear stress
; Accretionary prism
; Broadband ocean-bottom seismometers
; Clustering analysis
; Nankai troughs
; tremor
; Very low frequency
; Earthquakes
; accretionary prism
; broadband data
; cluster analysis
; earthquake event
; hierarchical system
; ocean bottom seismometer
; plate boundary
; seafloor
; subduction
; Nankai Trough
; Pacific Ocean
英文摘要: We investigated the distribution of very low frequency earthquakes (VLFEs) that occurred in the shallow accretionary prism of the eastern Nankai trough during one week of VLFE activity in October 2015. They were recorded very close from the sources by an array of broadband ocean bottom seismometers (BBOBSs) equipped in Dense Oceanfloor Network system for Earthquakes and Tsunamis 1 (DONET1). The locations of VLFEs estimated using a conventional envelope correlation method appeared to have a large scatter, likely due to effects of 3D structures near the seafloor and/or sources that the method could not handle properly. Therefore, we assessed their relative locations by introducing a hierarchal clustering analysis based on patterns of relative peak times of envelopes within the array measured for each VLFE. The results suggest that, in the northeastern side of the network, all the detected VLFEs occur 30–40 km landward of the trench axis, near the intersection of a splay fault with the seafloor. Some likely occurred along the splay fault. On the other hand, many VLFEs occur closer to the trench axis in the southwestern side, likely along the plate boundary, and the VLFE activity in the shallow splay fault appears less intense, compared to the northeastern side. Although this could be a snap-shot of activity that becomes more uniform over longer-term, the obtained distribution can be reasonably explained by the change in shear stresses and pore pressures caused by a subducting-ridge below the northeastern side of DONET1. The change in stress state along the strike of the plate boundary, inferred from the obtained VLFE distribution, should be an important indicator of the strain release pattern and localised variations in the tsunamigenic potential of this region. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110116
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan; Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan
Recommended Citation:
Toh A.,Obana K.,Araki E.. Distribution of very low frequency earthquakes in the Nankai accretionary prism influenced by a subducting-ridge[J]. Earth and Planetary Science Letters,2018-01-01,482