DOI: 10.1002/2013GL059118
论文题名: Deep long-period earthquakes west of the volcanic arc in Oregon: Evidence of serpentine dehydration in the fore-arc mantle wedge
作者: Vidale J.E. ; Schmidt D.A. ; Malone S.D. ; Hotovec-Ellis A.J. ; Moran S.C. ; Creager K.C. ; Houston H.
刊名: Geophysical Research Letters
ISSN: 0094-10476
EISSN: 1944-10207
出版年: 2014
卷: 41, 期: 2 起始页码: 370
结束页码: 376
语种: 英语
英文关键词: deep long-period earthquakes
; mantle wedge
Scopus关键词: Earthquakes
; Serpentine
; Corner flow
; Dehydration embrittlements
; Localized heating
; Long-period earthquakes
; Mantle wedge
; Subducting slabs
; Volcanic arc
; Dehydration
; dehydration
; earthquake event
; forearc basin
; heat flow
; island arc
; lava
; serpentine
; slab
; subduction zone
; tectonic wedge
; volcanism
; Oregon
; United States
; Calluna vulgaris
英文摘要: Here we report on deep long-period earthquakes (DLPs) newly observed in four places in western Oregon. The DLPs are noteworthy for their location within the subduction fore arc: 40-80 km west of the volcanic arc, well above the slab, and near the Moho. These "offset DLPs" occur near the top of the inferred stagnant mantle wedge, which is likely to be serpentinized and cold. The lack of fore-arc DLPs elsewhere along the arc suggests that localized heating may be dehydrating the serpentinized mantle wedge at these latitudes and causing DLPs by dehydration embrittlement. Higher heat flow in this region could be introduced by anomalously hot mantle, associated with the western migration of volcanism across the High Lava Plains of eastern Oregon, entrained in the corner flow proximal to the mantle wedge. Alternatively, fluids rising from the subducting slab through the mantle wedge may be the source of offset DLPs. As far as we know, these are among the first DLPs to be observed in the fore arc of a subduction-zone system. ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84893165234&doi=10.1002%2f2013GL059118&partnerID=40&md5=e05dac958de54239b4e26c36bf2b0a29
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7740
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth and Space Sciences, University of Washington, Seattle, WA, United States
Recommended Citation:
Vidale J.E.,Schmidt D.A.,Malone S.D.,et al. Deep long-period earthquakes west of the volcanic arc in Oregon: Evidence of serpentine dehydration in the fore-arc mantle wedge[J]. Geophysical Research Letters,2014-01-01,41(2).