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pro vyhledávání: '"ultra low velocity zone"'
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Much of our knowledge on deep Earth structure is based on detailed analyses of seismic waveforms that often have small amplitude arrivals on seismograms; therefore, stacking is essential to obtain reliable signals above the noise level. We present a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c2fd18f808697365eb175ec0c41216ba
https://eprints.whiterose.ac.uk/179283/1/2021JB022741.pdf
https://eprints.whiterose.ac.uk/179283/1/2021JB022741.pdf
Autor:
Allen K. McNamara
Publikováno v:
Tectonophysics. 760:199-220
Seismic tomography reveals 2 extensive regions in the lowermost mantle, beneath Africa and the Pacific, that exhibit lower-than-average seismic wave speeds. These regions have been named the Large Low Shear Velocity Provinces (LLSVPs), and they have
Publikováno v:
Earth and Planetary Science Letters. 507:40-49
It is suggested that ultra-low velocity zones (ULVZs) are often located near the boundary of large low shear velocity zones (LLSVPs). Previous studies have provided evidence of ULVZs residing along the western and northern boundary of the Pacific LLS
Autor:
Vitali B. Prakapenka, Jing Yang, Eran Greenberg, Jiachao Liu, Takuo Okuchi, Suyu Fu, Youjun Zhang, Jung-Fu Lin
Publikováno v:
Earth and Planetary Science Letters. 503:1-9
Preferential iron partitioning into melt during melting and crystallization of lower mantle minerals – bridgmanite and ferropericlase – can play a critical role in our understanding of the origin of the early Earth and its evolution to form chemi
Publikováno v:
Earth and Planetary Science Letters
Earth and planetary science letters, 2021, Vol.563 [Peer Reviewed Journal]
Earth and planetary science letters, 2021, Vol.563 [Peer Reviewed Journal]
We use core reflected ScS waves sensitive to a broad region of the core-mantle boundary beneath Hawaii to create the first high-resolution map of the Hawaiian ultralow-velocity zone (ULVZ). Positive ScS-S differential times are used to identify regio
Autor:
Takayuki Ishii, Eiji Ohtani, Keng-Hsien Chao, Frédéric Deschamps, Wen-Pin Hsieh, Jun Tsuchiya
Publikováno v:
Geophysical Research Letters. 47
The interior of Earth is stratified due to gravity. Therefore, the lateral heterogeneities observed as seismic anomalies by seismologists are extremely interesting: they hold the key to understand the composition, thermal status and evolution of the
Externí odkaz:
http://hdl.handle.net/2286/R.I.56962
Publikováno v:
Journal of Earth Science. 30:1293-1301
The pyrite-type FeO2H-FeO2 system has been experimentally confirmed to be stable in Earth’s lowermost mantle but there is limited information about its physical properties at high pressures constraining our understanding of its potential geophysica
Publikováno v:
Frontiers in Earth Science, Vol 7 (2019)
Metallic melt containing iron (Fe) and carbon (C) may be present at depths greater than 250 km inside the Earth. Depending on its wetting behavior, such dense melt may be trapped locally or drain into deep mantle and core. Here, we report experimenta