Yinhe Luo,1,2 Yingjie Yang,3 Yixian Xu,1,2 Hongrui Xu,1 Kaifeng Zhao1 and Kai Wang1 1Hubei Subsurface Multi-scale Imaging Lab (SMIL), Institute of Geophysics Geomatics, China University Geosciences, Wuhan, Hubei 430074, China. E-mail: luoyinhe@cug.edu.cn 2State Key Laboratory Geological Processes Mineral Resources, 3ARC Centre Excellence for Core to Crust Fluid Systems (CCFS)/GEMOC, Department Earth Planetary Sciences, Macquarie University, North Ryde, NSW 2109, Australia

Abstract Mechanisms for uplift and deformation of the Tibetan Plateau remain vigorously debated; hypotheses include stepwise growth, distributed thickening, crustal channel flow, each with a distinct anisotropic signature. We have developed new azimuthally shear velocity model lithosphere beneath eastern Tibet, based on ambient noise tomography from 643 seismic stations. In our model, upper crust is characterized by strong anisotropy fast axes that correlate surface geology mantle...

Multichannel analysis of surface waves (MASW) method is an effective tool for obtaining vertical shear wave profiles from a single non-invasive measurement. One key step the MASW generation dispersion image and extraction reliable curve raw multichannel shot records. Because different Rayleigh-wave modes normally interfere with each other in time space domain, it necessary to perform mode separation reconstruction increase accuracy phase velocities determined image. In this paper, we...

The need for incorporating the traction-free condition at air-earth boundary finite-difference modeling of seismic wave propagation has been discussed widely. A new implementation developed simulating elastic in which free-surface is replaced by an explicit acoustic-elastic boundary. Detailed comparisons seismograms with different implementations were undertaken using (2,2) (the operators are second order time and space) (2,6) (second sixth standard staggered-grid (SSG) schemes. Methods used...

Abstract The first tomographic images of P wave azimuthal and radial anisotropies in the crust upper mantle beneath Alps are determined by joint inversions arrival time data local earthquakes teleseismic events. Our results show south dipping European plate with a high‐velocity (high‐V) anomaly western central north Adriatic high‐V Eastern Alps, indicating that subduction polarity changes along strike Alps. anisotropy is characterized mountain chain‐parallel fast‐velocity directions (FVDs)...

The effects of different storage temperatures on the nutritional quality, color, and antioxidant capacity lotus seed juice correlations between various physicochemical indices during were investigated in this study. results showed that overall retention rate nutrients activity under low-temperature was better than 37 °C storage. Meanwhile, temperature had a significant effect increasing browning change L*. Pearson correlation redundancy analysis (RDA) reduction aggravated index system at...

High-frequency surface-wave techniques are widely used to estimate S-wave velocity of near-surface materials. Surface-wave methods based on inversions dispersion curves only suitable laterally homogeneous or smoothly varying heterogeneous earth models due the layered-model assumption during calculation curves. Waveform inversion directly fits waveform observed data, and it can be applied any kinds models. We have Love-wave in time domain velocity. finite-difference method as forward modeling...

Abstract The fate of subducted oceanic slabs can provide important clues to plate reconstruction through Earth history. Since in continental collision zones are typically not well preserved, ancient subduction have rarely been imaged by geophysical techniques. Here we present an exception from the Darbut belt Junggar accretionary collage southern Altaids Asia. We deployed a 182 km long magnetotelluric (MT) profile including 60 broadband sounding sites across belt. Quality off‐diagonal...

Abstract The mechanism and rupture process of the giant 2011 Tohoku-oki earthquake (Mw 9.0) are still poorly understood due to lack permanent near-field observations. Using seismic arrival times recorded by dense seismograph networks on land at ocean floor, we determine a detailed tomography model megathrust zone beneath Tohoku forearc. Our results show that coseismic slip initiated boundary between down-dip high-velocity anomaly an up-dip low-velocity anomaly. slow shallow depths near Japan...

Syncontractional extension is prominent in present-day Tibet, but its origin remains vigorously debated. Several deep-seated geodynamic processes (e.g., Indian underthrusting, horizontal flow, and mantle upwelling) have been linked to Tibetan rifting. underthrusting a good candidate because it can well explain why surface rifts are more south of the Bangong-Nujiang suture; however, how causes not understood lacks observational constraints. Seismic anisotropy, measured by exploiting...

Abstract The physical properties of the lithospheric and upper mantle's rock are determined by its composition in situ temperature pressure conditions. Together, they have been referred to as thermochemical structure. Information about structure could be obtained using methods from different disciplines earth sciences, which geophysical approaches show potential map 3D variations on both regional global scales. Thus, techniques for investigating spherical coordinates needed, including...

Natural-source audio-frequency magnetotelluric (AMT) data is highly sensitive to conductive anomalies associated with mineralization. To image the three-dimensional mineralized zones in Baogutu porphyry copper belt, Western Junggar, NW China, we deployed an AMT array consisting of 176 regularly distributed sites. A parallel 3D electromagnetic inversion scheme was employed invert this dataset. Using lab-measured electrical resistivity rock samples, interpret model by comparing it borehole...

In this study, we continue our previous work of imaging isotropic shear velocity to study the crustal radial anisotropy beneath Dabie orogen and surrounding regions by jointly analysing Rayleigh wave Love dispersion curves. addition processing vertical component data retrieve waves, collect horizontal-component continuous ambient noise waves from cross-correlations between station pairs. Then, measure phase curves at periods 8 35 s using a spectral method perform surface tomography obtain...