Seismic anisotropy in southern Costa Rica confirms upper mantle flow from the Pacific to the Caribbean
Seismic anisotropy in southern Costa Rica confirms upper mantle flow from the Pacific to the Caribbean
复制标题
哥斯达黎加南部的地震各向异性证实上地幔从太平洋流向加勒比海
DOI:
10.1130/g47826.1
复制
发表时间:
2020
期刊:
影响因子:
5.8
通讯作者:
Linkimer, Lepolt
中科院分区:
文献类型:
--
作者:
Levin, Vadim;Elkington, Stephen;Bourke, James;Arroyo, Ivonne;Linkimer, Lepolt
Surrounded by subducting slabs and continental keels, the upper mantle of the Pacific is largely prevented from mixing with surrounding areas. One possible outlet is beneath the southern part of the Central American isthmus, where regional observations of seismic anisotropy, temporal changes in isotopic composition of volcanic eruptions, and considerations of dynamic topography all suggest upper mantle flow from the Pacific to the Caribbean. We derive new constraints on the nature of seismic anisotropy in the upper mantle of southern Costa Rica from observations of birefringence in teleseismic shear waves. Fast and slow components separate by ∼1 s, with faster waves polarized along the 40°–50° (northeast) direction, near-orthogonally to the Central American convergent margin. Our results are consistent with upper mantle flow from the Pacific to the Caribbean and require an opening in the lithosphere subducting under the region.
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影响因子:
3.4
作者:
Lücke;I. G. Arroyo
通讯作者:
I. G. Arroyo
影响因子:
3.5
作者:
Gazel, Esteban;Hoernle, Kaj;Swisher, Carl, III
通讯作者:
Swisher, Carl, III
影响因子:
3.7
作者:
J. Hayes;W. Holbrook;D. Lizarralde;Harm J. A. Avendonk;A. Bullock;M. Mora;S. Harder;G. Alvarado;C. Ramirez
通讯作者:
C. Ramirez
影响因子:
3.3
作者:
L. Linkimer;I. Arroyo;G. Alvarado;Mario Arroyo;Henrriette Bakkar
通讯作者:
Henrriette Bakkar
DOI:
10.1029/2019gc008518
发表时间:
2019
期刊:
Geosystems
影响因子:
--
作者:
Li, Yiran;Levin, Vadim;Elkington, Stephen;Hlavaty, Janine
通讯作者:
Hlavaty, Janine