The Transition-Zone Water Filter Model for Global Material Circulation: Where Do We Stand?

2013 ◽  
pp. 289-313 ◽  
Author(s):  
Shun-Ichiro Karato ◽  
David Bercovici ◽  
Garrett Leahy ◽  
Guillaume Richard ◽  
Zhicheng Jing
Keyword(s):  
Transition Zone ◽  
Filter Model ◽  
Water Filter ◽  
Material Circulation ◽  
Zone Water

Whole-mantle convection and the transition-zone water filter

Nature ◽  
2003 ◽  
Vol 425 (6953) ◽  
pp. 39-44 ◽  
Author(s):  
David Bercovici ◽  
Shun-ichiro Karato
Keyword(s):  
Transition Zone ◽  
Mantle Convection ◽  
Water Filter ◽  
Zone Water

Sharpness of the 410-km discontinuity from the P410s and P2p410s seismic phases

2019 ◽  
Author(s):  
Lev Vinnik ◽  
Yangfan Deng ◽  
Grigoriy Kosarev ◽  
Sergey Oreshin ◽  
Zhou Zhang ◽  
...  
Keyword(s):  
Transition Zone ◽  
Southern Africa ◽  
Amplitude Ratio ◽  
Southern China ◽  
Broad Band ◽  
Receiver Functions ◽  
P Wave ◽  
Seismic Model ◽  
Yangtze Craton ◽  
Zone Water

Summary Sharpness of the 410-km boundary is of interest because it is sensitive to water content in the transition zone. We evaluate the width of the 410-km discontinuity with a new seismic method. Our estimates are inferred from the amplitude ratio of the P2p410s and P410s seismic phases that are detected in P-wave receiver functions. We applied this method to seismic recordings from arrays of broad-band stations deployed in central Fennoscandia, southern Africa and southern China. The obtained estimates of width of the 410-km discontinuity range from 10 to 22 km and always exceed the width of 7 km which is expected for anhydrous conditions. The enlarged width may be interpreted in terms of hydrous conditions, but we have found only one region (the eastern Yangtze Craton in China) where the broad 410-km discontinuity, as expected, is accompanied by a broad transition zone. Water in the transition zone may be a kind of a global phenomenon, but evidence of the enlarged width of the transition zone may be missing in most of our data because the reference seismic model is affected by water, as well.

Global electromagnetic induction constraints on transition-zone water content variations

Nature ◽  
2009 ◽  
Vol 460 (7258) ◽  
pp. 1003-1006 ◽  
Author(s):  
Anna Kelbert ◽  
Adam Schultz ◽  
Gary Egbert
Keyword(s):  
Water Content ◽  
Transition Zone ◽  
Electromagnetic Induction ◽  
Zone Water
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