منابع مشابه
The Effect of Water on the 410-km Discontinuity: An Experimental Study
In order to evaluate the effect of H on the pressure and transition interval of the olivine-wadsleyite transformation, synthesis experiments were carried out in hydrous and anhydrous peridotite compositions at 1400oC. Under hydrous, near-saturated conditions, the pressure of the transition is 1.0 ± 0.5 GPa lower than under anhydrous conditions. In addition, the two-phase interval appears to bro...
متن کاملAppraising the reliability of converted wavefield imaging: application to USArray imaging of the 410-km discontinuity
S U M M A R Y We develop a generic method to appraise the reliability of wavefield imaging methods and use it to validate some novel observations on the 410-km discontinuity. The core concept of the error appraisal method is to produce a simulated data set that replicates the geometry of the real data. Here we implemented two simulation methods: (1) flat layer primary P to S conversions, and (2...
متن کاملUbiquitous Low-Velocity Layer Atop the 410-Km Discontinuity in the Northern Rocky Mountains
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متن کاملSeismic evidence for accumulated oceanic crust above the 660-km discontinuity beneath southern Africa
[1] High-pressure assemblages of subducted oceanic crust are denser than the normal upper mantle but less dense than the uppermost lower mantle. Thus subducted oceanic crust may accumulate at the base of the upper mantle. Direct observational evidence for this hypothesis, however, remains elusive. We present an analysis of a negativepolarity shear wave converted from compressional wave at a sei...
متن کاملThermoelastic properties of ringwoodite (Fex,Mg1 x)2SiO4: Its relationship to the 520 km seismic discontinuity
We combine density functional theory (DFT) within the local density approximation (LDA), the quasiharmonic approximation (QHA), and a model vibrational density of states (VDoS) to calculate elastic moduli and sound velocities of g-ðFex,Mg1 xÞ2SiO4 (ringwoodite), the most abundant mineral of the lower Earth’s transition zone (TZ). Comparison with experimental values at room-temperature principle...
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ژورنال
عنوان ژورنال: Geophysical Journal International
سال: 1970
ISSN: 0956-540X,1365-246X
DOI: 10.1111/j.1365-246x.1970.tb01797.x