DOI: 10.1002/2016GL070580
论文题名: Subduction geometry beneath south central Alaska and its relationship to volcanism
作者: Martin-Short R. ; Allen R.M. ; Bastow I.D.
刊名: Geophysical Research Letters
ISSN: 0094-8589
EISSN: 1944-8320
出版年: 2016
卷: 43, 期: 18 起始页码: 9509
结束页码: 9517
语种: 英语
英文关键词: Alaska
; subduction
; tomography
; volcanism
Scopus关键词: Shear flow
; Shear waves
; Tomography
; Volcanoes
; Alaska
; Mantle structure
; Slab structures
; Subduction
; Velocity model
; Volcanic field
; Volcanism
; Wadati-Benioff Zones
; Tectonics
英文摘要: The southern Alaskan margin captures a transition between compression and strike-slip-dominated deformation, accretion of the overthickened Yakutat terrane, termination of Aleutian arc magmatism, and the enigmatic Wrangell Volcanic Field. The extent of subduction and mantle structure below this region is uncertain, with important implications for volcanism. We present compressional and shear wave mantle velocity models below south central Alaska that leverage a new seismometer deployment to produce the most complete image of the subducting Pacific-Yakutat plate to date. We image a steeply dipping slab extending below central Alaska to >400 km depth, which abruptly terminates east of ~145°W. There is no significant slab anomaly beneath the nearby Wrangell volcanoes. A paucity of volcanism is observed above the subducting Yakutat terrane, but the slab structure below 150 km depth and Wadati-Benioff zone here are similar to those along the Aleutian-Alaska arc. Features of the mantle wedge or overlying lithosphere are thus responsible for the volcanic gap. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84988369452&doi=10.1002%2f2016GL070580&partnerID=40&md5=7fc76b53944bd4b9d438adce9c5d30bf
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9552
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: U.C. Berkeley Seismological Laboratory, Berkeley, CA, United States
Recommended Citation:
Martin-Short R.,Allen R.M.,Bastow I.D.. Subduction geometry beneath south central Alaska and its relationship to volcanism[J]. Geophysical Research Letters,2016-01-01,43(18).