A5045960756- Seismic Waves and Analysis
- Seismic Imaging and Inversion Techniques
- High-pressure geophysics and materials
- Geophysics and Sensor Technology
- earthquake and tectonic studies
- Ultrasonics and Acoustic Wave Propagation
- Geotechnical Engineering and Underground Structures
- Seismology and Earthquake Studies
- Magnetism in coordination complexes
- Optical measurement and interference techniques
- Carbohydrate Chemistry and Synthesis
- Railway Engineering and Dynamics
- Soil Moisture and Remote Sensing
- Metal complexes synthesis and properties
- Landslides and related hazards
- Lanthanide and Transition Metal Complexes
- Vanadium and Halogenation Chemistry
- Protein Tyrosine Phosphatases
- Cancer, Hypoxia, and Metabolism
- Cancer Cells and Metastasis
- Optical Systems and Laser Technology
- Advanced Measurement and Detection Methods
- Geophysical Methods and Applications
- Geological and Geochemical Analysis
- Inorganic Chemistry and Materials
Southern University of Science and Technology
2019-2025
Hainan Normal University
2023
Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)
2022
University of Science and Technology of China
1999-2018
Yangon University of Economics
2011
Surface wave inversion based on dispersion curves of higher modes is increasingly being applied to estimate near-surface S-wave velocity structures using active or passive sources. Moreover, sensitivity analysis important for estimating the confidence inverted results. In this study, we define a function and kernel, give their analytic expressions then propose method results redesign initial structure through analysis. Three kinds common layered models [velocity-increasing-with-depth...
Abstract We utilize an array method called the frequency‐Bessel transformation to extract multimodal dispersion curves of Rayleigh waves from ambient seismic noise data recorded by USArray Transportable Array. observe as many five overtones' in Midwestern United States, and four three curves, respectively, U.S. Great Plain area Northeastern States. employ a quasi‐Newton invert for shear velocity. find that sensitivity overtones deeper structures is higher than fundamental mode same frequency...
Abstract Ambient noise recorded by a dense seismic array provides an opportunity to resolve detailed 3D shear wave velocity (Vs) structures. We utilize the frequency‐Bessel transform (F‐J) method compute dispersion spectrogram for ambient Long Beach array, extract multimodal curves with deep learning approach, and invert gradient algorithm. The addition of higher‐mode reduces nonuniqueness improved high‐resolution Vs model that shows good correlations known stratigraphic sequence geologic...
Abstract In the past two decades, seismic ambient-noise cross correlation (CC) has been one of most important technologies in seismology. Usually, only fundamental-mode surface-wave dispersion was extracted from ambient noise. Recently, with frequency–Bessel transform (F-J) method, overtone can also be noise and it adds significant value inversion. This method verified to effective for array records earthquake events. this article, we describe our algorithm a Python package called CC-FJpy....
Eastern Turkey is an ideal location to study continental collision, which manifested here by the presence of extensive volcanism and rapid tectonic uplift. To better understand relationship between these surface phenomena underground structures, we collect continuous waveform data from 121 seismic stations in region investigate S wave velocity structure crust upper mantle using ambient noise tomography. We obtain Rayleigh dispersion curves for periods 5 100 s based on frequency-Bessel (F-J)...
ABSTRACT Significant progress has been made in the field of determining dispersion curves surface waves layered media following pioneering work Thomson and Haskell. Subsequent research efforts have primarily focused on overcoming computational obstacles that arisen. Nonetheless, a recurring challenge practical scenarios involves models incorporating low-velocity layers, for which occurrence “mode-kissing” missing roots presents difficulties. In response to this issue, we present an algorithm...
Abstract The eastern South China Block (SCB) has experienced complex and drastic reworking processes since the early Neoproterozoic, mechanisms of which remain unclear. To better understand continental in SCB, we imaged shear‐wave velocity structure crust upper mantle SCB its adjacent areas with F‐J multimodal ambient noise tomography method. seismic data were acquired by 652 stations this area. model presents widespread mid‐crustal low‐velocity zones (MCLVZs) (UMLVZs), distribution shows a...
The ocean bottom cable (OBC) acquisition technique has become a significant geophysical method to simultaneously record geophone and hydrophone signals. signals have been used by many surface wave dispersion inversion methods for seafloor imaging. However, geophones are not always perfectly coupled seabed, which can lead low-quality or unavailable In contrast, hydrophones naturally sea water pressure disturbances induced Scholte waves propagating on the ocean-bottom interface. We attempt...
The northwestern Bohemian Massif and adjacent areas are a tectonically active region associated with complex geodynamic activities, that manifest as Quaternary volcanism, earthquake swarms in the upper middle crust, degassing of CO 2 , crustal fluid migration. intricate tectonic evolution activities this reflect complexity structure therein. However, models derived from previous studies area offer different, even contradictory information regarding existence mid-crustal low-velocity zone...
The conventional surface wave inversion methodology relying upon dispersion curve analyses is frequently confounded by the phenomenon known as "mode kissing" well absorptive properties of seismic waves traversing near-surface geologic strata. We propose a deep learning approach to overcome challenges in due complex geology. A convolutional neural network regression model developed directly map spectra shear velocity profiles. takes entire spectrograms input, avoiding issues from manual...
ABSTRACT This article presents an efficient and effective modified generalized reflection transmission (R/T) (mGRT) coefficient method for dispersion-curve calculation of the Rayleigh Love waves. We construct a novel dispersion function based on kernel calculating synthetic seismograms in elastic layered half-space model. It improves root searching using monotonicity sections between roots. introduce auxiliary to accelerate root-searching procedure by approximating number roots equation. To...
The crustal low-velocity zone (LVZ), an important anomaly found in some regional structures of Iceland, is still absent the Icelandic average velocity structure due to limitations tomography methods. Using stations from HOTSPOT experiment and other supplemental throughout we apply frequency-Bessel transform method (F-J method) extract first two mode dispersion curves ambient noise data. We obtain S-wave (Vs) model Iceland down 120 km depth, where LVZs at depths 12–22 below 55 are found....
Abstract A room temperature single-crystal X-ray structure determination of Zn(N3)2bpy (bpy = 4.4′-bipyridyl) shows it to be a porous structure, comprised parallel one-dimensional Zn(μ-N3)2Zn(μ-N3)2Zn- chains, the zinc atoms cross linked in second dimension by bridging bpy hgands. Crystals are monoclinic, C2/m, Z 2, a= 16.000(2), b=11.442(1), c 11.272(1) Å, β= 120.75(1)°, conventional R on ∣F∣ being 0.040 for 1576 independent observed (I2[sgrave](I)) reflections. The zinc/azide chain is an...
Four couples of 5,6-membered bis(metallacyclic) Pt(II) complexes with acetylide and isocyanide auxiliary ligands have been prepared characterized. The structures (-)-2 (-)-3 are confirmed by single-crystal X-ray diffraction, showing a distorted square-planar coordination environment around the nucleus. Both solutions solid samples all emissive at RT. Acetylide-coordinated lower energy emission than those isocyanide-coordinated ones. spectra N^N'*C-coordinated derivatives show maximum...
SUMMARY In this study, we propose a systematic and effective method, that is, an extended version of the generalized reflection/transmission (R/T) coefficient for computing phase-velocity (${c}_r$) dispersion curves, attenuation ($\alpha $) eigenfunctions both Rayleigh Love waves as well ellipticity in layered viscoelastic-vertical transversely isotropic (VTI) media. The numerical scheme combining root-searching method with local optimization is designed determining complex-valued modal...
Earth and Space Science Open Archive This work has been accepted for publication in Seismological Research Letters. Version of RecordESSOAr is a venue early communication or feedback before peer review. Data may be preliminary. Learn more about preprints. preprintOpen AccessYou are viewing the latest version by default [v1]CC-FJpy: A Python Package seismic ambient noise cross-correlation frequency-Bessel transform...