Abstract We estimate the upper mantle temperature of Antarctic Plate based on thermoelastic properties minerals and S velocities using a new 3‐D shear velocity model, AN1‐S. Crustal temperatures surface heat fluxes are then calculated from assuming steady state thermal conduction. The at top asthenosphere beneath oceanic region West Antarctica is higher than dry solidus, indicating presence melt. From values, we generate depth maps lithosphere‐asthenosphere boundary Curie isotherm. show that...

A new tomographic S wave velocity model for the upper mantle beneath South America is presented. We developed and applied a method of simultaneously inverting regional Rayleigh waveforms fundamental mode group velocities, to better constrain structure Moho depth. used ∼5700 dispersion curves 1537 trains with paths principally passing through American continent. The joint inversion this data set provided three‐dimensional (3‐D) depth America, which fits both waveform sets well. New features...

Abstract Since 2007/2008, seismographs were deployed in many new locations across much of Antarctica. Using the records from 122 broadband seismic stations, over 10,000 Rayleigh wave fundamental‐mode dispersion curves have been retrieved earthquake waveforms and ambient noise. processed data set, a 3‐D S ‐velocity model for Antarctic lithosphere was constructed using single‐step surface tomographic method, Moho depth map estimated model. derived crustal thicknesses, average ratio...

We estimate crustal structure and thickness of South America north roughly 40°S. To this end, we analyzed receiver functions from 20 relatively new temporary broadband seismic stations deployed across eastern Brazil. In the analysis include teleseismic some regional events, particularly for that recorded few suitable earthquakes. first average Poisson's ratio using two different stacking methods. then combine constraints with results previous function studies. interpolate between station...

The north China craton (NCC) is one of the oldest cratons in world; however, lithosphere was destructed during Phanerozoic tectonism and then became tectonically seismically active. Because lithospheric structure this complex has not been well studied, mechanism behind thinning, transformation, destruction remains debated. Using an efficient scalable 3‐D surface wave tomography method, we obtain a high‐resolution regional S velocity model that shows three‐dimensional NCC. In addition,...

Abstract A teleseismic P receiver function (RF) carries information on the first-order structures of crustal thickness and P- to S-velocity ratio (VP/VS) as well second-order Moho dip anisotropy. The have trade-off effects RFs, but commonly used methods try extract either or using part features RFs. We thus propose a more generic approach, DA–H–κ, incorporate advantages simultaneously determine Then, approach was applied analyze synthetic RFs observational Longmenshan fault belt. results...

We processed a large number of vertical‐component seismograms recorded by broadband seismic stations in and around China ultimately retrieved ∼33 140 regional ∼10 360 teleseismic fundamental‐mode group‐velocity measurements at 40 s periods, with fewer for shorter longer periods. directly inverted the three‐dimensional lithospheric S ‐velocity model Chinese mainland. Synthetic test results data fit or misfit analysis demonstrated reliability our surface‐wave tomographic inversion. The imaged...

For a period of about 1 yr between the summers 2010 and 2011, 25 broad-band seismographs were deployed in roughly linear array across eastern end Qaidam basin Qilian Shan northeastern Tibetan plateau. This region is probably most suitable place to study ongoing convergence interaction high plateau main Asian continental plate. Low-frequency P receiver function analysis data provides an image crust mantle down 700 km depth. In addition Moho at 45–65 depth beneath profile, 410 660...

Abstract We combine a ∼485 km‐long seismic reflection profile and S‐wave speed transect from surface‐wave tomography, to reveal the lithospheric deformation mode of intracontinental Qinling orogeny, central China. observe thick lithosphere keel in convergence zone between Yangtze Block North China Craton (NCC) shallow‐crustal (8–15 km depth) décollement that extends into lower crust Orogen. Combining with surface structural geology magmatism, we interpret these findings as kinematically...

The Ordos Block and the Qinling Orogen in central China are key regions that have been affected by Indo-Eurasian collision, convergence of North China, South Siberian cratons, subduction Pacific oceanic plate during Phanerozoic. Investigation crustal structure this area can therefore provide significant insights into interactions among these tectonic blocks plates. Chinese Academy Geological Sciences deployed ca. 249 portable broad-band seismic stations from 2011 to 2016, we retrieved P-wave...

SUMMARY The crust of the South American platform recorded imprints dynamic processes related with opening Central and Atlantic but has not been well measured. Crustal structure can be retrieved from teleseismic receiver functions using H–κ stacking, nearly parallel stripes high stacking values existing in images for seismic stations sedimentary area cause difficulties identifying solutions. We show that some seemingly spurious do point to any layer solution are helpful identification...

SUMMARY The amalgamation and breakup of the West Gondwana shaped South American platform. dynamics during processes can be reflected by crust anisotropy platform, but there are no specialized crustal anisotropic measurements yet. Splitting analysis Moho-converted shear waves in P-wave receiver functions (Pms) reveal crustal-scale anisotropy, which is important for understanding dynamic evolution interpretation mantle from splitting core–mantle refracted (XKS phases). This study measured old...

The effects of an electric field on the phase behavior water confined inside a nanoscale space were studied using molecular dynamics simulations. It was found that diffusion coefficient reaches its maximum when value surfaces’ charge is at threshold, qc = 0.5e. This unexpected phenomenon attributed to intermediate state between two stable ice states induced by nanoconfinement and generated charged surfaces, respectively. Our finding helpful understand electromelting electrofreezing under with field.

SUMMARY We present an updated joint tomographic method to simultaneously invert receiver function waveforms and surface wave dispersions for a 3-D S-wave velocity (Vs) model. By applying this observations from ∼900 seismic stations with priori Moho constraints previous studies, we construct lithospheric model crustal-thickness map the central–east Tibetan plateau. Data misfit/fitting shows that inverted can fit functions reasonably well, checkerboard tests show retrieve major structural...

The behavior of structural OH in clinopyroxene (augite and omphacite) during successive heating has been investigated by situ micro-FTIR measurements under temperatures ranging from room temperature to 500 °C at 100 increment. first group band (3620-3640 cm-1) exhibits a systematic decrease peak position upon heating, while the other two groups (3520-3535 3450-3465 show only little change. Both augite omphacite display integral absorbance fundamental stretching vibration heating. IR spectra...

Using active and passive seismology data we derive a shear (S) wave velocity model Poisson's ratio (σ) across the Chilean convergent margin along profile at 38°15′S, where Mw 9.5 Valdivia earthquake occurred in 1960. The derived S-wave was constructed using three independently obtained models that were merged together. In upper part of (0–2 km depth), controlled source from explosions used to obtain an traveltime tomogram. For middle (2–20 temporary array carry out dispersion analysis....