globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2018.04.020
Scopus记录号: 2-s2.0-85045666292
论文题名:
Origin of spectacular fields of submarine sediment waves around volcanic islands
作者: Pope E.L.; Jutzeler M.; Cartigny M.J.B.; Shreeve J.; Talling P.J.; Wright I.C.; Wysoczanski R.J.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 493
起始页码: 12
结束页码: 24
语种: 英语
英文关键词: eruption-fed turbidity currents ; geohazards ; landslides ; submarine bedforms ; volcanic islands
Scopus关键词: Hazards ; Landslides ; Location ; Ocean currents ; Sediment transport ; Seismology ; Submarines ; Turbidity ; Bedforms ; Geo-hazards ; High resolution seismic ; Pyroclastic density currents ; Seafloor morphologies ; Supercritical densities ; Turbidity current ; Volcanic islands ; Volcanoes ; bedform ; geological hazard ; geomorphological response ; seafloor ; sediment transport ; submarine landslide ; turbidity current ; volcanic eruption ; volcanic island
英文摘要: Understanding how large eruptions and landslides are recorded by seafloor morphology and deposits on volcanic island flanks is important for reconstruction of volcanic island history and geohazard assessment. Spectacular fields of bedforms have been recognised recently on submerged flanks of volcanic islands at multiple locations worldwide. These fields of bedforms can extend over 50 km, and individual bedforms can be 3 km in length and 150 m in height. The origin of these bedform fields, however, is poorly understood. Here, we show that bedforms result from eruption-fed supercritical density flows (turbidity currents) in some locations, but most likely rotational landslides at other locations. General criteria are provided for distinguishing between submarine bedforms formed by eruptions and landslides, and emphasise a need for high resolution seismic datasets to prevent ambiguity. Bedforms associated with rotational landslides have a narrower source, with a distinct headscarp, they are more laterally confined, and internal bedform structure does not suggest upslope migration of each bedform. Eruption-fed density currents produce wide fields of bedforms, which extend radially from the caldera. Internal layers imaged by detailed seismic data show that these bedforms migrated up-slope, indicating that the flows that produced them were Froude supercritical. Due to the low density contrast between interstitial fluid and sediment, the extent and dimensions of submarine eruption-fed bedforms is much greater than those produced by pyroclastic density currents on land. © 2018 The Author(s)
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被引频次[WOS]:38   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109876
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: Department of Geography, Durham University, Science Laboratories, South Road, Durham, DH1 3LE, United Kingdom; School of Physical Sciences, Centre of Excellence in Ore Deposits (CODES), University of Tasmania, Hobart, TAS 7001, Australia; Departments of Earth Science and Geography, Durham University, Science Laboratories, South Road, Durham, DH1 3LE, United Kingdom; National Oceanography Centre Southampton, European Way, Southampton, SO14 3ZH, United Kingdom; School of Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton, Southampton, European Way, Hampshire, SO14 3ZH, United Kingdom; Geotek Ltd, 4 Sopwith Way, Drayton Fields, Daventry, NN11 8PB, United Kingdom; Vice Chancellor's Office, University of Canterbury, Private Bag 4800, Christchurch, 8140, New Zealand; National Institute of Water and Atmospheric Research, PO BOX 14-901, Wellington, New Zealand

Recommended Citation:
Pope E.L.,Jutzeler M.,Cartigny M.J.B.,et al. Origin of spectacular fields of submarine sediment waves around volcanic islands[J]. Earth and Planetary Science Letters,2018-01-01,493
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