![]() ![]() ![]() Estabrook, A detailed receiver function image of the upper mantle discontinuities in the Japan subduction zone, Earth Planet. Weidner, Elastic moduli of wadsleyite ( \-Mg2SiO4 ) to 7 gigapascals and 873 kelvin, Science, 281, 675–677, 1998. Yeh, A preliminary study of crustal structure in Taiwan region using receiver function analysis, Geophys. (Ed.), IASPEI1991 Seismological Tables, 167 pp., Research School of Earth Sciences, Australian National University, Canberra, Australia, 1991. Nakanishi, Upper mantle velocity structure in the western Pacific rim estimated from short-period recordings at Matsushiro Seismic Array System, Earth Planets Space, 52, 459–466, 2000. Kennett, Three-dimensional seismic structure beneath the Australian region from refracted wave observations, Geophys. Kagan, Y., Accuracy of modern global earthquake catalogs, Phys. Stixrude, Petrology, elasticity and composition of the mantle transition zone, J. Nuttli, Travel-time curves and upper mantle structure from long-period S waves, Bull Seismol. Res., 103, 2673–2692, 1998.įujisawa, H., Elastic wave velocities of forsterite and its β-spinel form and chemical boundary hypothesis for the 410-km discontinuity, J. Shearer, Global mapping of topography on transition zone velocity discontinuities by stacking SS precursors, J. Hemley, Elasticity of forsterite to 16 GPa and the composition of the upper mantle, Nature, 378, 170–173, 1995.įlanagan, M. Anderson, Seismic velocities in mantle minerals and the mineralogy of the upper mantle, J. Bostock, The 520 km discontinuity?, Bull. Hellfrich, Topography of the “410” and “660” km seismic discontinuities in the Izu-Bonin subduction zone, Geophys. Liang, Evidence of a slab-subducted lithosphere beneath central Taiwan from seismic waveforms and travel times, Earth Planet. Kosarev, Elevation of the 410 km discontinuity beneath the central Tien Shan: Evidence for a detached lithosphere root, Geophys. A., Summary value smoothing of physical time series with unequal intervals, J. Punong- bayan, A new insight on the geometry of subducting slabs in northern Luzon, Philippines, Tectonophysics, 339, 279–310, 2001.īolt, B. Schilling, Editorial: Introduction to special issue on phase transitions and mantle discontinuities, Phys. Anderson, Composition of the uppermantle: geophysical tests of two petrological models, Geophys. Gilbert, Uniqueness in the inversion of inaccurate gross earth data, Philosophical Transactions of the Royal Society of London A, 266, 187–269, 1970.īass, J. Toksoz, Surface waves on a spherical earth, 1, upper mantle structure from Love waves, J. Bass, Mineralogy and composition of the upper mantle, Geophys. An additional arrival on the stacks may be caused by a localized discontinuity near 530 km depth.Īnderson, D. Phase-weighted stacking on a cluster of short-period seismograms with first arrival energy from within the transition zone provides independent support for the validity of the models later arrivals are detected close to the predicted times and slownesses for energy emerging from the lowermost upper mantle and the top of the lower mantle. The data also imply relatively low wavespeed jumps of 0.6–1.0% and 1.1–1.5% respectively across the elevated 410-km discontinuity and a lower discontinuity at 676 km depth, and high wavespeed gradients in the transition zone. A plausible explanation is low temperatures within the subducted South China Sea plate. The 410-km discontinuity, however, appears to be elevated to about 325 km depth, based on clear identification of the travel-time branch produced by refraction within the transition zone, and estimates of its first and second derivatives with respect to distance. Wavespeeds are characteristic of oceanic upper mantle. P waves from earthquakes south of Taiwan, recorded by seismic stations within and around Taiwan, were used to define two average wavespeed models WPSP01 and WPSP02 for the upper mantle and transition zone below the Luzon region. ![]()
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