Accuracy of techniques for upper mantle phases
Finite difference techniques of improved accuracy
... low accuracy formulae, ueing very small mosh lengths * hence the popularity of Siupcon^a ...high accuracy, Ixit on the ease with which such accuracy is ...
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Surface wave studies of the Australian upper mantle
... The presence of noise complicates the analysis and interpretation of surface wave data, by reducing the precision of velocity measurements and by restricting the range of periods that can be analysed. On the other hand, ...
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Computational petrology: Subsolidus equilibria in the upper mantle
... 4) Solvus and miscibility gap determinations Well-known examples include the alkali feldspar solvus on the join NaAlSi 3 O 8 - KAlSi 3 O 8 and the miscibility gap between orthopyroxene and clinopyroxene in the join Mg 2 ...
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Upper mantle structure from long-period SH
... regions, is driven by the principle of simplicity: that is, the resulting model is the simplest possible model consistent with the data. 1.3 SCOPE OF THIS THESIS The further progress of observational seismology depends ...
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Experimental and thermodynamic studies of upper mantle phase relations
... This study follows, in principle, the simple system approach. Firstly experiments were conducted investigating the transition from spinel lherzolite to garnet lherzolite in the system C a0-M g0-A l20 3-S i0 2 (CMAS). The ...
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Experimental Evidence for a Reduced Metal-saturated Upper Mantle
... uppermost mantle as sampled by xenoliths, peridotite massifs and primitive basaltic melts appears to be relatively oxidized, with oxygen fugacities between the magnetite^wu«stite and fayalite^ferro- ...
15
The application of synthetic seismograms to the interpretation of crustal and upper mantle structure
... The difference in intercept times for the Pn phase recorded from the Moura and Callide mines can be used together with the apparent velocities, to solve for the true refractor velocity, and the refractor dip. In applying ...
255
Mapping the upper mantle discontinuities beneath China with teleseismic receiver functions
... the upper mantle. The travel times of the P and Pds phases are calculated with the 1-D ray tracing method, and then the relative time of Pds phases of different depths to the P phase can be ...
7
Upper mantle imaging beneath the Japan Islands by Hi net tiltmeter recordings
... of phases following the direct P wave) recorded by the two types of sensors from the same event in different frequency ...the upper mantle ...
6
The sensitivity of GNSS measurements in Fennoscandia to distinct three-dimensional upper-mantle structures
... may be different. Future investigations with British GNSS stations should analyze their potential sensitivity for the area. 5 Conclusions Unlike previous studies, this paper includes realistic struc- tures of lateral ...
11
The seismic signature of Upper‐Mantle Plumes: application to the Northern East African Rift
... Figure 6. Horizontal slices and vertical cross-sections through the P-wave model N8 with a 200 ◦ C hot layer, focused below Afar. The orientation of the cross-sections (black line) is shown in each 200 km depth slice. ...
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Fluid/melt wall rock interaction in the upper mantle beneath the central Pannonian basin
... the phases of the studied xenoliths laser ablation ICP –MS measurements were carried out using an Elan 6100 ICP-MS equipped with CETAC LSX-200 laser ablation system in the Geocenter ...analyzed phases ...
12
Hydrogen in the Nominally Anhydrous Phases and Possible Hydrous Phases in the. Lower Mantle. Huawei Chen
... parameters and atomic positions of Ca, Si and O for P 4/mmm and I4/mcm crystal structures from Tanaka et al. (1993); Caracas and Wentzcovitch (2006). The start- ing lattice parameters was calculated from XPEAKPO. We ...
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On accuracy of upper quantiles estimation
... the upper quantiles are design values for the dimen- sioning of hydrological structures, the accuracy of their es- timates is a major and extremely important issue for flood frequency ...the accuracy ...
9
Evolution of a polymineralic mantle shear zone and the role of second phases in the localization of deformation
... [ 1 ] The influence of second phases (e.g., pyroxenes) on olivine grain size was studied by quantitative microfabric analyses of samples of the Hilti massif mantle shear zone (Semail ophiolite, Oman). The ...
21
Regional Variations in Upper Mantle Structure Beneath North America
... Several types of seismological data, including surface wave group and phase velocities, travel times from large explosions, and teleseismic travel time anomalies, h[r] ...
216
Fault-controlled hydration of the upper mantle during continental rifting
... mechanics and fluid flow properties of fault zones. Journal of Structural Geology, 2010. Reston, T.J., The structure, evolution and symmetry of the magma-poor rifted margins 219. of t[r] ...
18
Analysis of Upper and Lower Mantle Structure Using Shear Waves
... The differential residuals, PKIKP-P are larger below Bolivia and southern Peru than anywhere else in the world, with the more vertically traveling waves (PKIKP) b[r] ...
363
Seismic waveform tomography of the central and eastern Mediterranean upper mantle
... Although computationally more expensive than ray-based to- mography methods, the advantage of waveform tomography lies in its ability to make use of all and any part of seismo- grams that has a sufficient signal-to-noise ...
22
Seismic body wave attenuation in the upper mantle beneath the Australian continent
... of Q, Q ex: Jex, is shown to require a distribution function P(L) ex: L -m vVith m = 4 - 2£X. Kara to also indicated that a physically more sensible analysis of lateral[r] ...
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