Transition zone structure under a stationary hot spot: Cape Verde

George Helffrich; Bruno Faria; João F.B.D. Fonseca; Alexandra Lodge; Satoshi Kaneshima

doi:10.1016/j.epsl.2009.11.001

Transition zone structure under a stationary hot spot: Cape Verde

George Helffrich, Bruno Faria, João F.B.D. Fonseca, Alexandra Lodge, Satoshi Kaneshima

Research output: Contribution to journal › Article › peer-review

25 Citations (Scopus)

Abstract

We report on a two-year seismic deployment in the Cape Verde Islands, one goal of which was to study the upper mantle to determine its structure under a hot spot that is stationary in the hot spot reference frame. We find from analysis of P-to-S receiver functions estimated from broadband seismic recordings that, within uncertainty, the time separation between the 410 and 660 km discontinuities is normal compared to radial earth models. Thus, to exist, even stationary hot spots do not require vertical thermal anomalies from deep melting sources anchored in the lower mantle or at the core-mantle boundary or their anomalies are narrower than ∼ 250 km in the upper mantle.

Original language	English
Pages (from-to)	156-161
Number of pages	6
Journal	Earth and Planetary Science Letters
Volume	289
Issue number	1-2
DOIs	https://doi.org/10.1016/j.epsl.2009.11.001
Publication status	Published - Jan 15 2010
Externally published	Yes

All Science Journal Classification (ASJC) codes

Geochemistry and Petrology
Geophysics
Space and Planetary Science
Earth and Planetary Sciences (miscellaneous)

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10.1016/j.epsl.2009.11.001

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abstract = "We report on a two-year seismic deployment in the Cape Verde Islands, one goal of which was to study the upper mantle to determine its structure under a hot spot that is stationary in the hot spot reference frame. We find from analysis of P-to-S receiver functions estimated from broadband seismic recordings that, within uncertainty, the time separation between the 410 and 660 km discontinuities is normal compared to radial earth models. Thus, to exist, even stationary hot spots do not require vertical thermal anomalies from deep melting sources anchored in the lower mantle or at the core-mantle boundary or their anomalies are narrower than ∼ 250 km in the upper mantle.",

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AU - Helffrich, George

AU - Faria, Bruno

AU - Fonseca, João F.B.D.

AU - Lodge, Alexandra

AU - Kaneshima, Satoshi

PY - 2010/1/15

Y1 - 2010/1/15

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AB - We report on a two-year seismic deployment in the Cape Verde Islands, one goal of which was to study the upper mantle to determine its structure under a hot spot that is stationary in the hot spot reference frame. We find from analysis of P-to-S receiver functions estimated from broadband seismic recordings that, within uncertainty, the time separation between the 410 and 660 km discontinuities is normal compared to radial earth models. Thus, to exist, even stationary hot spots do not require vertical thermal anomalies from deep melting sources anchored in the lower mantle or at the core-mantle boundary or their anomalies are narrower than ∼ 250 km in the upper mantle.

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JO - Earth and Planetary Science Letters

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Transition zone structure under a stationary hot spot: Cape Verde

Abstract

All Science Journal Classification (ASJC) codes

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