DOI: 10.1002/grl.50329
论文题名: Seismic gap beneath Logachev Seamount: Indicator for melt focusing at an ultraslow mid-ocean ridge?
作者: Schlindwein V. ; Demuth A. ; Geissler W.H. ; Jokat W.
刊名: Geophysical Research Letters
ISSN: 0094-9103
EISSN: 1944-8834
出版年: 2013
卷: 40, 期: 9 起始页码: 1703
结束页码: 1707
语种: 英语
英文关键词: mid-ocean ridge processes
; oceanic crust
; seismicity and tectonics
Scopus关键词: Geophysical evidence
; Lithospheric thickness
; Mid-ocean ridge process
; Ocean bottom seismometer
; Oceanic crust
; Possible mechanisms
; Seismicity and tectonics
; Ultra-slow spreading
; Structural geology
; Submarine geology
; Tectonics
; Volcanoes
; Earthquakes
; earthquake hypocenter
; faulting
; magmatism
; melt
; microearthquake
; mid-ocean ridge
; oceanic lithosphere
; seamount
; seismic survey
; seismicity
; seismograph
; ultrasonics
; volcanic earthquake
; Arctic Ocean
; Greenland Sea
; Knipovich Ridge
; Norwegian Sea
英文摘要: Ultraslow spreading mid-ocean ridges have a low magma budget and melt is distributed unevenly along the ridge axis. There is little or no basaltic crust between isolated magmatic centers. The processes that focus melts to segments of robust magmatism are not yet understood. During a seismic survey of the ultraslow spreading Knipovich Ridge in the Norwegian-Greenland Sea with ocean bottom seismometers, we discovered a seismic gap in the upper mantle beneath Logachev Seamount, where micro-earthquakes clearly delineate a shallowing of the maximum depth of faulting. A topography of the lithosphere that allows melts to travel laterally along its base and rise in areas of thin lithosphere has been proposed as a possible mechanism to explain the focusing of melts at volcanic centers, but has never been confirmed observationally. Our results are the first geophysical evidence for an along-axis variation of the lithospheric thickness at an ultraslow spreading ridge. Key Points Earthquakes beneath the ultraslow Knipovich ridge are deeper than expectedMaximum hypocenter depths raise significantly beneath Logachev volcanoEarthquakes point to undulating lithosphere base that guides melt to volcanoes ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84879111680&doi=10.1002%2fgrl.50329&partnerID=40&md5=275abe71ed6b4faafbd0bf10c782f1a4
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6367
Appears in Collections: 气候减缓与适应
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作者单位: Alfred Wegener Institute for Polar and Marine Research, Am Alten Hafen 26, D-27568 Bremerhaven, Germany
Recommended Citation:
Schlindwein V.,Demuth A.,Geissler W.H.,et al. Seismic gap beneath Logachev Seamount: Indicator for melt focusing at an ultraslow mid-ocean ridge?[J]. Geophysical Research Letters,2013-01-01,40(9).