WebSep 12, 2024 · At both global and regional scales, the mantle discontinuities have been imaged by differential travel times and amplitude ratios between SS wave and its precursors, and the SS phase reflected at the surface while the precursors reflected at the depth of mantle discontinuities. WebWe link this mid-mantle discontinuity to the upper reaches of deflected mantle plumes upwelling in the region. Reverse-time migration full-waveform imaging is a powerful …
Weak and vanishing upper mantle discontinuities generated by …
WebDec 1, 2001 · The seismic discontinuities at 410 and 660. km depth in the mantle are generally believed to be due to phase transformations in its major component, olivine.. An increasing observational base of short-period regional seismic network data supports this view. Here, we analyse cross-sections of discontinuity topography in the northwest … WebThe discontinuity was discovered by Beno Gutenberg (1889-1960), a seismologist who made several important contributions to the study and understanding of the Earth's … gymnastics room
Upper-Mantle Discontinuities - University of California, San Diego
WebRecords suggest a local depression of 30 km in the 660 discontinuity and a broadening of the transition zone directly beneath and to the west of the Tonga slab, in a region where there may be nearly horizontal slab. The ScS results are augmented by local phases that interact with the 410 and 660. The phases used here are s410p, P660p, and S660p. WebFeb 28, 2024 · Clinopyroxene, as a major phase of the Earth's upper mantle (10-30 vol%) and the dominating mineral of eclogite (about 60-70 vol%), is one of the most important yet least studied groups of minerals of the Earth's interior. ... Implications for detecting the 520 discontinuity and metastable ringwoodite at depths greater than 660 km" Earth and ... WebOct 26, 2007 · Globally imaged upper mantle seismic discontinuities ( 1) observed at depths near 410, 520, and 660 km arise from mineralogic phase transformations of the mineral … gymnastics roodepoort