A5062354047- earthquake and tectonic studies
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Seismic Imaging and Inversion Techniques
- Geological and Geophysical Studies
- Lipid Membrane Structure and Behavior
- Methane Hydrates and Related Phenomena
- Porphyrin and Phthalocyanine Chemistry
- Seismology and Earthquake Studies
- Molecular Junctions and Nanostructures
- Force Microscopy Techniques and Applications
- Hydrocarbon exploration and reservoir analysis
- Seismic Waves and Analysis
- Paleontology and Stratigraphy of Fossils
- Fluid Dynamics and Thin Films
- Landslides and related hazards
- Silicon Nanostructures and Photoluminescence
- Organic Electronics and Photovoltaics
- Liquid Crystal Research Advancements
- Paleontology and Evolutionary Biology
- Evolution and Paleontology Studies
- Chalcogenide Semiconductor Thin Films
- Radioactive element chemistry and processing
- Analytical Chemistry and Sensors
- Organic Light-Emitting Diodes Research
Guangzhou Institute of Geochemistry
2021-2024
Chinese Academy of Sciences
1986-2024
Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)
2022-2023
Tohoku University
2017-2020
China University of Geosciences
2017-2019
Rigaku (United States)
2010
Institute of Modern Physics
2007
Fudan University
2007
Durham University
1987-2002
Institute of Physics
1986-1991
Abstract A detailed 3‐D model of P wave isotropic velocity and azimuthal anisotropy beneath SE Asia is obtained by jointly inverting local earthquake arrival times teleseismic relative travel‐time residuals. Our results show that the high‐velocity (high‐V) subducting Australian slab has penetrated through mantle transition zone (MTZ) reached a depth ∼1,200 km Sumatra, whereas high‐V subducted toward north trapped within MTZ Java. The Hainan plume revealed clearly as significant low‐velocity...
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)...
Abstract We determine high‐resolution 3‐D tomographic images of P ‐wave isotropic velocity, radial anisotropy and azimuthal beneath NE Asia down to 800 km depth. Our results show negative (i.e., V horizontal < vertical ) in the asthenosphere big mantle wedge (BMW), which may reflect mineral alignment caused by flow asthenosphere. Across Tanlu fault zone (TLF), western eastern parts BMW exhibit high low velocities, respectively. Combining our with surface geological features, we speculate...
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...
The formation mechanism of curved subduction zones remains poorly understood. To address this issue, we conduct a joint inversion P-wave travel-time data from local earthquakes and teleseismic events for 3-D isotropic anisotropic velocity tomography the Calabrian zone. Our results show that in central northern Apennines, Adriatic Sea plate subducts on both eastern western sides. westward-dipping slab retreats eastward, compressing mantle below double-side This compression pushes material to...
The first P-wave tomography of 3-D azimuthal and radial anisotropy the Cascadia subduction zone is determined by inverting local teleseismic arrival-time data. Fast-velocity directions (FVDs) in crust are generally trench-parallel, reflecting N-S compression along margin. Radial (RAN) negative (i.e., Vpv > Vph) upper-mantle wedge beneath volcanoes back-arc area, hot wet upwelling flows associated with fluids from dehydration reactions young warm Juan de Fuca plate that subducting toward...
Abstract This paper describes the preparation and properties of Langmuir-Blodgett films tetra-4-tert-butyl phthalocyaninatosilicon dichloride (ttb PcSiCl2). Our experiments indicate relative ease with which this material can be prepared compared similarly substituted compounds. All isotherm, optical electrical data are consistent molecules being stacked edge-on to substrate molecular faces having a preferred orientation perpendicular dipping direction. The uniformity is reflected in their...
Abstract Inland crustal earthquakes usually occur in the brittle upper crust (0–20 km depths), but 6 September 2018 Eastern Iburi earthquake (M 6.7) took place southern Hokkaido with a focal depth of ~37 km, causing 41 fatalities and serious damage to local infrastructure. The reason why this event was so deep its causal mechanism are still unclear. In work we study three-dimensional P S wave seismic attenuation (1/Q) structure source zone earthquake. Our results show that occurred at...
Abstract We determine high‐resolution tomographic models of isotropic P‐wave velocity (Vp) and tilting‐axis anisotropy the Alaska subduction zone using a large number local teleseismic data recorded at many portable permanent network stations in around Alaska. find flat high‐Vp slab mantle transition (410–670 km depths) beneath western Alaska, which is connected with subducting Pacific 0–410 depths, suggesting that big wedge has formed under Our model reveals complex flows asthenosphere....
Abstract Earthquakes deeper than 60 km generally occur in subducting slabs. However, on 21 September 2013 two earthquakes (M 4.8 and 3.0) occurred at ∼71 to 75 depths the upper mantle beneath central Wyoming stable North American continent, where there is no actively slab present. The cause of events still unclear. Here, we present detailed 3D P-wave isotropic anisotropic tomography down 750 depth under adjacent areas. Our result shows that took place within a high-velocity (high-V) body...
Abstract In subduction zones with slab‐slab interactions, the pattern of mantle convection is very complex and still unclear. this study, we jointly invert a large number P S wave arrival time data local earthquakes for 3‐D isotropic anisotropic velocity structures Banda zone. Along curved arc, subducting Indo‐Australian slab detected clearly as high‐velocity zone, its azimuthal anisotropy changes along arc strike, representing fossil within modified by processes. Around northern edge slab,...
Abstract The Cascadia margin is an unusual subduction zone characterized by the downdip movement of young and thin oceanic plates, where mantle flow intraslab deformation are still unclear. Here we present new anisotropic tomography zone, in which hexagonal symmetry axis anisotropy tilting rather than horizontal or vertical as assumed previous studies seismic anisotropy. Subduction‐induced entrained toroidal flows under discriminated well spatial relationship between tilting‐axis slab...
Abstract Nonvolcanic low‐frequency earthquakes (LFEs) usually occur in young and warm subduction zones under condition of near‐lithostatic pore fluid pressure. However, the relation between LFEs subducting slab age has never been documented so far. Here we estimate lithospheric Philippine Sea (PHS) beneath Nankai arc by linking seismic tomography a plate reconstruction model. Our results show that SW Japan take place parts (~17–26 Myr) PHS slab. no LFE occurs Kii channel where is very (~15...
Abstract Teleseismic tomography is a powerful tool to study the 3‐D structure of upper mantle beneath local seismic network, but robustness its images has been challenged by increasing size volume in recent studies. This because teleseismic uses relative travel‐time residuals (RTTRs) that are contaminated more whole‐mantle heterogeneity for larger region. In this work, we correct RTTRs events heterogeneities outside using two global tomographic models. Our results show correction necessary...
The electrical and electroluminescent properties of Au/phthalocyanine Langmuir-Blodgett film/ZnSe diodes are reported. Under forward bias, at room temperature, the devices exhibited blue-white electroluminescence. Further investigation revealed two peaks in spectrum: 460nm 500nm. peak coincides with maximum output photoluminescence spectrum is attributed to band-to-band recombination.
Crustal thickness (H) and Vp/Vs ratio (κ) are two important parameters in characterizing a crustal structure. Their estimates from receiver function data often have large uncertainties due to the severe trade-off between when functions only Moho P-to-S converted phase its multiples weak or missing, which common tectonically active regions. Here, we extended H–κ stacking method by combining PmP traveltimes determine H, κ Vp simultaneously. We developed deconvolution technique measure using...
Abstract We present high‐resolution 3‐D tomographic models of isotropic P‐wave velocity ( V p), azimuthal anisotropy, and radial anisotropy down to 1,300 km depth beneath the central eastern United States (CEUS), which are obtained by inverting a great number local teleseismic data making whole‐mantle correction travel‐time recorded USArray. Trade‐offs between anisotropies occur due correlation incidence angles seismic rays, but use uniform crisscrossing rays can reduce trade‐off effect. Our...