Results 1 to 10 of about 70 (66)
Kilometer-scale structure on the core–mantle boundary near Hawaii [PDF]
Nature Communications, 2022 A new paper constrains a high-resolution ultra-low velocity zone (ULVZ) structure at the base of the Hawaiian mantle. The authors further propose this to be a chemically distinct ULVZ with increasing iron content towards the core mantle boundary.
Zhi Li +3 more
doaj +2 more sources
Slab control on the mega-sized North Pacific ultra-low velocity zone [PDF]
Nature Communications, 2022 Ultra-low velocity zones (ULVZs) are localized small-scale patches with extreme physical properties at the core-mantle boundary. Here, the authors discover a mega-sized ULVZ (1,500 × 900 km) at the northern edge of the Pacific Large Low Velocity Province.
Jiewen Li, Daoyuan Sun, Dan J. Bower
doaj +2 more sources
Geochemistry, Geophysics, Geosystems, 2022 Strong waveform complexities, including multipathing of the S diffracted phase and rapid changes in differential ScS‐S times, are observed for multiple deep Fiji earthquakes recorded at the USArray.
Voon Hui Lai +2 more
exaly +2 more sources
Pdiff Postcursors from the Base of the Hawaiian ULVZ
The Seismic RecordUltra-low velocity zones (ULVZs) are anomalous regions on the core–mantle boundary. In the past decade, several ULVZs, and particularly the Hawaiian ULVZ, have been studied using postcursors to core-diffracted S waves (Sdiff), which constrain their shear-
Sanne Cottaar +2 more
exaly +2 more sources
Review of seismic velocity anomalies in the lower mantle
地球与行星物理论评, 2023 The lower mantle accounts for more than 50% of the total volume of the Earth, and influences the evolution of the Earth. Early studies showed that the lower mantle is relatively homogeneous, but since the 1970s, seismic tomography revealed the velocity ...
Yutong Shi +4 more
doaj +1 more source
The Most Parsimonious Ultralow‐Velocity Zone Distribution From Highly Anomalous SPdKS Waveforms
Geochemistry, Geophysics, Geosystems, 2021 The locations of ultralow‐velocity zones (ULVZs) at the core‐mantle boundary (CMB) have been linked to a variety of features including hot spot volcanoes and large low‐velocity province (LLVP) boundaries, yet only a small portion of the CMB region has ...
Michael S. Thorne +5 more
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The root to the Galápagos mantle plume on the core-mantle boundary
Seismica, 2022 Ultra-low velocity zones (ULVZs) are thin anomalous patches on the boundary between the Earth's core and mantle, revealed by their effects on the seismic waves that propagate through them. Here we map a broad ULVZ near the Galápagos hotspot using shear-
Sanne Cottaar +3 more
doaj +1 more source
Geochemistry, Geophysics, Geosystems, 2023 Ultralow velocity zones (ULVZs) and seismic anisotropy are both commonly detected in the lowermost mantle at the edges of the two antipodal large low velocity provinces (LLVPs).
Jonathan Wolf, Maureen D. Long
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From Subduction to LLSVP: The Core‐Mantle Boundary Heterogeneities Across North Atlantic
Geochemistry, Geophysics, Geosystems, 2022 The distribution of Ultra‐low Velocity Zones (ULVZs) is generally associated with the Large Low Shear Velocity Zones (LLSVPs). However, subducted slabs may be important for the characteristics of the ULVZs as well.
An Fan +4 more
doaj +1 more source
Elastic Properties of the Pyrite‐Type FeOOH‐AlOOH System From First‐Principles Calculations
Geochemistry, Geophysics, Geosystems, 2021 The stability, structure, and elastic properties of pyrite‐type (FeS2 structured) FeO2H were determined using density functional theory‐based computations with an internally consistent Coulombic self‐interaction term (Ueff). The properties of pyrite‐type
Elizabeth C. Thompson +2 more
doaj +1 more source