Physics of the Earth and Planetary Interiors This is an RSS file. You can use it to subscribe to this data in your favourite RSS reader or to display this data on your own website or blog.

Phase relations of MgSiO3-FeSiO3 system up to 64 GPa and 2300 K using multianvil apparatus with sintered diamond anvils
Publication date: Available online 17 August 2019Source: Physics of the Earth and Planetary InteriorsAuthor(s): Takeshi Arimoto, Tetsuo Irifune, Masayuki Nishi, Yoshinori Tange, Takehiro Kunimoto, Zhaodong LiuAbstractWe have developed techniques to perform precise determinations of phase transition boundaries under the pressure and temperatures corresponding to those of the deep lower mantle, using Kawai-type multianvil apparatus (KMA) with sintered diamond anvils. By optimizing the materials and dimensions of the high-pressure furnace assembly, we achieved stable generation of high temperature to 2300 K, at pressures up...
Source: Physics of the Earth and Planetary Interiors - August 19, 2019 Category: Physics Source Type: research

Editorial Board
Publication date: September 2019Source: Physics of the Earth and Planetary Interiors, Volume 294Author(s): (Source: Physics of the Earth and Planetary Interiors)
Source: Physics of the Earth and Planetary Interiors - August 16, 2019 Category: Physics Source Type: research

Partition coefficient of phosphorus between liquid metal and silicate melt with implications for the Martian magma ocean
In this study, we investigated the behavior of phosphorus in a Martian magma ocean scenario, and measured the partition coefficient of phosphorus (DP) between liquid metal and silicate melt within the pressure range of 3–8 GPa, temperatures between 1973 and 2173 K and oxygen fugacity ranging from −1.5 to ~ −2.5 as normalized to the iron-wüstite oxygen buffer. Our results show DP increasing with pressure but decreasing with temperature. A decrease of oxygen fugacity has a negative effect on DP. The moderately siderophile character of phosphorus indicates that the Martian core might be an important reservoir of ph...
Source: Physics of the Earth and Planetary Interiors - August 16, 2019 Category: Physics Source Type: research

Fate of water in subducted hydrous sediments deduced from stability fields of FeOOH and AlOOH up to 20 GPa
Publication date: Available online 27 July 2019Source: Physics of the Earth and Planetary InteriorsAuthor(s): Takashi Yoshino, Edward Baker, Kyle DuffeyAbstractFe- and Al-hydroxides (FeOOH and AlOOH) in sedimentary rocks form the top part of the subducted oceanic lithosphere and are known to be stable along a normal geotherm in the lower mantle. Banded Iron Formations (BIFs) and bauxite ore deposits formed in the Earth's oceans can transport significant amount of water into the Earth's deep interior by subduction of FeOOH and AlOOH and may occasionally serve water to the core. However, stabilities of these hydrous phases h...
Source: Physics of the Earth and Planetary Interiors - July 28, 2019 Category: Physics Source Type: research

Nebular Atmosphere to Magma Ocean: A Model for Volatile Capture During Earth Accretion
Publication date: Available online 26 July 2019Source: Physics of the Earth and Planetary InteriorsAuthor(s): Peter L. Olson, Zachary D. SharpAbstractThe origin and abundance of mantle volatiles present major questions for Earth’s evolution. Here we quantify volatile capture from an atmosphere derived from the solar nebula during accretion, using a boundary layer model of magma ocean dynamics coupled to a nebular atmosphere model adapted to Earth formation. Key elements include (i) nebular atmosphere winds based on scaling laws for deep rotating fluids; (ii) water production at the magma surface; and (iii) gas transfer b...
Source: Physics of the Earth and Planetary Interiors - July 26, 2019 Category: Physics Source Type: research

Mechanical coupling of the motion of the surface plate and the lower mantle slab: Effects of viscosity hill, yield strength, and depth-dependent thermal expansivity
Publication date: September 2019Source: Physics of the Earth and Planetary Interiors, Volume 294Author(s): Takeo Kaneko, Tomoeki Nakakuki, Hikaru IwamoriAbstractSinking rates of the subducted lithosphere in the Earth's lower mantle inferred from seismic tomography images indicate much lower rates than that of the observed subducting surface plate motion. This implies that the surface plate motion is independent of descending flow in the deep mantle. Seeking to understand the mechanical coupling of the slab penetrating into the deepest mantle with the surface plate motion, we performed numerical modeling of the subducting l...
Source: Physics of the Earth and Planetary Interiors - July 26, 2019 Category: Physics Source Type: research

Voxel solution and 3D sub-surface imaging in the Douala sedimentary sub-basin (Cameroon)
Publication date: Available online 22 July 2019Source: Physics of the Earth and Planetary InteriorsAuthor(s): Eric N. Ndikum, Kenfack J. Victor, F. Koumetio, Serge H. Pokam Kengni, Charles T. TabodAbstractGravity data consisting of a total of 128 data points located between latitudes 3° 21′N and 4° 9′ N and longitudes 8° 27′ E and 9° 16′ E have been computed for Bouguer and residual anomaly maps in this study. From the plots of these maps which are characterized by very high positive ring shaped contours towards the centre, which are suggestive of a subsurface intrusive body, three anomaly zones as well as two ...
Source: Physics of the Earth and Planetary Interiors - July 24, 2019 Category: Physics Source Type: research

Experimentally deformed lawsonite at high pressure and high temperature: Implication for low velocity layers in subduction zones
In this study, we report a new lawsonite CPO pattern resulting from dislocation creep deformation that has not been previously observed. The [100] axes concentrate into the shear direction and the [010] axes are normal to the shear plane, respectively (we refer to this as “type-1” CPO). Such CPO is consistent with our transmission electron microscope (TEM) observations identifying (010)[100] as a dominant dislocation slip-system. The seismic properties resulting from this CPO show the fast P-wave direction to be parallel to the shear direction, and the slow P-wave direction and maximum S-wave anisotropy normal to the s...
Source: Physics of the Earth and Planetary Interiors - July 19, 2019 Category: Physics Source Type: research

New interpretation of the reduction phenomenon in the electrical resistivity of rock masses before local earthquakes
This article attempts to quantify this hypothesis based on 3D modeling of the observed electromagnetic effects. It is shown that variations in the apparent resistivity are due to changes in the electrical resistivity in a narrow fault zone located at the focus of the dipole-dipole sounding system. The changes occur at depths of <2–2.5 km and are due to low-resistivity fluid saturation of the highly porous fracture crushing zone. Small, smooth changes in the resistivity of the containing medium on both sides of the fault are associated with regional stresses in blocks of rocks and are not associated with the local e...
Source: Physics of the Earth and Planetary Interiors - July 16, 2019 Category: Physics Source Type: research

Publisher's note
Publication date: August 2019Source: Physics of the Earth and Planetary Interiors, Volume 293Author(s): (Source: Physics of the Earth and Planetary Interiors)
Source: Physics of the Earth and Planetary Interiors - July 16, 2019 Category: Physics Source Type: research

Editorial Board
Publication date: August 2019Source: Physics of the Earth and Planetary Interiors, Volume 293Author(s): (Source: Physics of the Earth and Planetary Interiors)
Source: Physics of the Earth and Planetary Interiors - July 16, 2019 Category: Physics Source Type: research

3D non-smooth inversion of gravity data by zero order minimum entropy stabilizing functional
Publication date: Available online 3 July 2019Source: Physics of the Earth and Planetary InteriorsAuthor(s): Mohammad RezaieAbstractThe inversion of gravity data can generate subsurface density models by minimizing a Tikhonov parametric functional. The Tikhonov parametric functional has a misfit functional and a stabilizing functional which the latter functional governs the solution to be smooth or piecewise-constant. Piecewise-constant models can discern sharp geological interfaces. Therefore the models are highly demanded especially for mineral exploration. Some stabilizing functionals such as minimum support (MS) and mi...
Source: Physics of the Earth and Planetary Interiors - July 5, 2019 Category: Physics Source Type: research

Source characteristics of the NW Himalaya and its adjoining region: Geodynamical implications
In this study, we propose a novel interpretation of source parameters estimated using Brune model for the NW Himalaya and its adjoining region. Analysis of 157 events (2.2 ≤ Mw ≤ 4.9) resulted in the scaling relationship between seismic moment (M0) and corner frequency (fc) for the region as: M0 = 8 × 1022 fc−2.89, which is in good unison to the Garhwal and the Kumaon Himalaya with analogous seismogenic potential. Variability of Kappa (0.01 s - 0.08 s) with varying number of events (2.5 ≤ M ≤ 5.0) at different depths is indicative of nature and extent of structural heterogeneity ben...
Source: Physics of the Earth and Planetary Interiors - July 5, 2019 Category: Physics Source Type: research

A study of the relations between ML, Me, Mw, apparent stress, and fault aspect ratio
Publication date: Available online 4 July 2019Source: Physics of the Earth and Planetary InteriorsAuthor(s): Robert F. MereuAbstractThe energy magnitude Me used here is based on the square root of the observed seismic trace Lg coda energy. This version of the magnitude is of great interest as it can be used as a more accurate replacement for ML. To-day the moment magnitude Mw is the magnitude that is used particularly for large earthquakes and unlike ML, it does not saturate. In this paper, it is shown that the theoretical “ratio” between the moment magnitude Mw and Me and therefore Mw and ML for an individual earthqua...
Source: Physics of the Earth and Planetary Interiors - July 5, 2019 Category: Physics Source Type: research

Structure of the crust and upper mantle beneath Bass Strait, southeast Australia, from teleseismic body wave tomography
We present new constraints on the lithospheric velocity structure of Bass Strait and the adjoining landmasses of mainland Australia and Tasmania in order to better constrain their geological and tectonic relationship. This is achieved by performing teleseismic tomography using data from fifteen deployments of WOMBAT and BASS transportable arrays, which span southeastern Australia. The starting model for the teleseismic tomography includes crustal velocity structure constrained by surface waves extracted from ambient seismic noise data and a Moho surface and broad-scale variations in 3-D upper mantle velocity structure from...
Source: Physics of the Earth and Planetary Interiors - July 3, 2019 Category: Physics Source Type: research