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Hot mantle transition zone beneath Iceland and the adjacent Mid-Atlantic Ridge inferred from P-to-S conversions at the 410- and 660-km discontinuities

Hot mantle transition zone beneath Iceland and the adjacent Mid-Atlantic Ridge inferred from P-to-S conversions at the 410- and 660-km discontinuities


Title: Hot mantle transition zone beneath Iceland and the adjacent Mid-Atlantic Ridge inferred from P-to-S conversions at the 410- and 660-km discontinuities
Author: Shen, Yang
Solomon, Sean C.
Bjarnason, Ingi Þorleifur   orcid.org/0000-0001-5716-7053
Purdy, G. M.
Date: 1996-12-01
Language: English
Scope: 3527-3530
University/Institute: Háskóli Íslands
University of Iceland
School: Verkfræði- og náttúruvísindasvið (HÍ)
School of Engineering and Natural Sciences (UI)
Department: Raunvísindastofnun (HÍ)
Science Institute (UI)
Series: Geophysical Research Letters;23(24)
ISSN: 0094-8276
1944-8007 (eISSN)
DOI: 10.1029/96GL03371
Subject: Jarðeðlisfræði; Jarðskjálftar; Jarðskjálftamælingar; Eldvirkni; Jarðmöttull
URI: https://hdl.handle.net/20.500.11815/1034

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Citation:

Shen, Y., Solomon, S. C., Bjarnason, I. T., & Purdy, G. M. (1996). Hot mantle transition zone beneath Iceland and the adjacent Mid-Atlantic Ridge inferred from P-to-S conversions at the 410- and 660-km discontinuities. Geophysical Research Letters, 23(24), 3527-3530. doi:doi:10.1029/96GL03371

Abstract:

P‐to‐S conversions from the two primary discontinuities near 410 and 660 km depth (P410s and P660s phases) are evident in particle motions and receiver functions of teleseismic body waves recorded by broadband seismic stations in Iceland. The average arrival times of P410s and P660s are later by 7.0±0.5 s (standard error) and 4.7±0.2 s, respectively, than predicted by the iasp91 Earth model. Differential P660s–P410s travel times indicate that the upper mantle transition zone between the 410‐ and 660‐km discontinuities is 23±9 km thinner than in the iasp91 model. From estimates for the Clapeyron slopes of the phase transitions associated with these discontinuities, this lesser transition zone thickness is consistent with temperatures 180±70 K hotter than normal. We interpret this result as evidence for upwelling mantle flow at 400–700 km depth beneath Iceland and the adjacent Mid‐Atlantic Ridge.

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