A5082807956- Seismic Waves and Analysis
- Earthquake Detection and Analysis
- Geophysical and Geoelectrical Methods
- Geophysical Methods and Applications
- earthquake and tectonic studies
- Nonlinear Differential Equations Analysis
- Seismic Imaging and Inversion Techniques
- Differential Equations and Boundary Problems
- Differential Equations and Numerical Methods
- Ionosphere and magnetosphere dynamics
- Mathematical and Theoretical Epidemiology and Ecology Models
- Seismology and Earthquake Studies
- Geophysics and Sensor Technology
- Evolution and Genetic Dynamics
- Mathematical Biology Tumor Growth
- Geomagnetism and Paleomagnetism Studies
- Methane Hydrates and Related Phenomena
- Metallurgy and Material Forming
- Planetary Science and Exploration
- Topology Optimization in Engineering
- Numerical methods for differential equations
- Fluid Dynamics and Turbulent Flows
- Holomorphic and Operator Theory
- Plasma and Flow Control in Aerodynamics
- Acoustic Wave Phenomena Research
Hefei University of Technology
2016-2025
Institute of Mechanics
2022-2024
Shanghai University
2022-2023
Civil Aviation University of China
2003-2023
Nanjing Tech University
2022
Nanjing University
2016-2022
Institute of Acoustics
2021-2022
Collaborative Innovation Center of Advanced Microstructures
2022
Southwest University of Science and Technology
2022
Stanford University
2014-2016
Abstract Corner‐sharing and edge‐sharing networks are the two most important material genomes. Inspired by efficient electron transport capacity of corner‐sharing structures low steric hindrance units, an attempt is made to exert both merits combining these networks. Here, a unique self‐assembled hybrid SrCo 0.55 Fe 0.5 O 3‐ δ nanorod composed phase Co 3 4 structure synthesized through Co‐site enrichment method, which exhibits overpotentials 310 290 mV at 10 mA cm –2 for oxygen‐evolving...
The devastating Hunga Tonga-Hunga Ha’apai underwater volcano erupted at ~04:15 UT on 15 January 2022. We captured the waves that from propagating in ionosphere by monitoring total electron content (TEC) perturbations utilizing ground-based global navigation satellite system (GNSS) receivers receive electromagnetic signals transmitted geostationary satellites operated BeiDou Navigation Satellite System (BDS). Meanwhile, ground barometers detected unusual enhancements of air pressure traveling...
Abstract An earthquake doublet occurred in Turkey on 6 February 2023, with propagating Rayleigh waves triggering perturbations the ionospheric total electron content (TEC) for both M 7.8 (EQ7.8) and 7.5 (EQ7.5). A discrepancy between velocities of TEC has been noted, but its causes remain unresolved previous studies. In this study, we calculated frequency‐dependent waves, considering their intrinsic dispersive characteristics. To retrieve TEC, utilized ground‐based Global Navigation...
Studied in this paper are the properties of seismoelectromagnetic waves radiated by a double couple saturated porous medium arising from electrokinetic effect. First, using Pride's equations, we derive Green's function magnetic field due to single point force as complement previous authors' works, which only functions solid displacement, relative fluid–solid displacement and electric were expressed. Furthermore, extend these cater for moment tensor sources. Then fields frequency-space domain...
[1] This work investigates surface electromagnetic wavefields generated by a finite fault due to electrokinetic effect with Pride's theory as the governing equations. A is discretized into series of small subfaults, each which taken point source different initiation time. The whole are then synthesized stacking those all subfaults. Numerical simulations vertical strike-slip constant rupturing velocity conducted on basis derived formalism. Simulation results show that generates observable...
Abstract The coseismic electromagnetic signals observed during the 2004 M w 6 Parkfield earthquake are simulated using electrokinetic theory. By a finite fault source model obtained via kinematic inversion, we calculate electric and magnetic responses to rupture. result shows that synthetic agree with data for both amplitude wave shape, especially early portions of records (first 9 s) after earthquake, supporting effect as reasonable mechanism generation fields. More work is needed explain...
Abstract Studied in this article are the properties of electromagnetic (EM) fields generated by an earthquake due to motional induction effect, which arises from motion conducting crust across Earth's magnetic field. By solving governing equations that couple elastodynamic with Maxwell equations, we derive seismoelectromagnetic wavefields excited a single‐point force and double‐couple source full space. Two types EM disturbances can be generated, i.e., coseismic field accompanying seismic...
Achieving broadband sound absorption in two-port open ducts is of fundamental importance the acoustics, with wide applications ranging from noise control to duct mitigation. Yet existing metamaterial designs are usually based on use Helmholtz-type cavities, posing limitations resulting performance. Here, we propose and experimentally demonstrate a mechanism that uses coupling modulation resonance energy leakage loss ventilated metamaterials realize optimal absorption. We design slit-type...
SUMMARY In this study, we adopt a horizontally layered model consisting of air, seawater and undersea porous rock develop an analytically based method to calculate the seismic electromagnetic (EM) fields generated by earthquakes. We conduct numerical simulations investigate characteristics EM response at receivers located seafloor, in near sea surface respectively. The results show that two kinds signals can be identified records these receivers, namely, early wave (seismic-to-EM conversion...
The authors introduce a new method for calculating acoustic-gravity waves in spherically layered atmosphere. is applied to numerically simulate wave behaviour, including Earth curvature effects, and compares with the horizontally model (HLM). Results show that at near-field distances, our aligns closely HLM, but significant differences emerge far field, particularly beyond an epicentral distance of 50°, where becomes critical. Our successfully simulates head seismic phases, Rayleigh...
In this research, we explore the EM response generated by earthquake fault-slip attributable to piezomagnetic effect. To achieve this, integrate elastodynamic equations with Maxwell's equations. We put forward a semi-analytical method for simulating seismo-electromagnetic fields within horizontally-stratified model. model, coupled are resolved in frequency-wavenumber domain. Subsequently, responses time-space domain obtained through Hankel transform and inverse Fourier transform. carry out...
Electromagnetic response to undersea earthquakes in a layered ocean model Qianli Cheng, Yongxin Gao   We adopt horizontally consisting of air, seawater and porous rock develop an analytically based method calculate the seismic electromagnetic (EM) fields generated by earthquakes. conduct numerical simulations investigate characteristics EM at receivers located seafloor, near sea surface respectively. The results show that two kinds signals can be identified records these receivers,...
The propagation of seismo-traveling ionospheric disturbances (STIDs) is generally observed at one specific altitude layer. On 2 April 2024, a Mw 7.4 earthquake struck Hualien, which was the biggest since 1999 Chi-Chi in Taiwan region. In this study, co-located vertical monitoring system combined with observation two horizontal layers ionosphere utilized to study STIDs associated Hualien earthquake. can capture from ground surface up height ~350 km. addition, changes electric currents and TEC...
We validate the branch-cut integration (BCI) technique presented in companion paper. The numerical result shows that early electromagnetic (EM) signal calculated by BCI method is good agreement with full waveform real-axis method. further find to calculate EM only integrals along vertical branch cuts are around k0 and kem points needed, whereas neither Pf(P), S Ps nor residues of poles necessary. conduct experiments analyse generated an earthquake a porous half-space, including its component...
Earthquake taking place in a fluid-saturated porous medium can generate electromagnetic (EM) waves because of the electrokinetic effect. These generated EM arrive at distant observatory much earlier than seismic their velocities are faster those waves. They may explain early signals which have been detected before detection after occurrences earthquakes. In this study, we attempt to analyse such kind induced by an earthquake The is assumed be fault slip and modelled moment tensor point...
Abstract Geostationary BeiDou satellites monitor the total electron content (TEC) in ionosphere over certain locations 24 hr per day without interruption and act as ionosphere‐based seismometers. The system detected perturbations TEC before both M6.1 Dali M7.3 Qinghai earthquakes that occurred during night of 21–22 May 2021. reside mainly an area within a distance ∼700 km from epicenters earthquakes. standing waves revealed persistence subsurface wave source occurrences earthquakes, which...
Abstract We numerically compute seismoelectric wavefields generated at a fluid/porous medium interface by an explosive source in the fluid. Our numerical experiments show that electromagnetic (EM) signals accompanying P , S and waves can be observed receivers located fluid regions near interface. Such EM are produced inhomogeneous seismic their amplitudes decrease with distance from Under excitation of whose strength is within capability industry air guns, electric magnetic fields accompany...
We develop a finite-difference frequency-domain (FDFD) method to simulate the 2-D SHTE-mode seismoelectric waves. The approximates spatial derivatives and non-derivative terms of wave equations using weighted-averaging operators in 25-point computational stencil. To suppress reflections seismic EM waves from truncated boundaries, we apply perfectly matched layers (PMLs) surrounding interior modelled area absorb waves, add several additional out PMLs validate FDFD by comparing solutions...
SUMMARY We propose a frequency-domain finite-element (FDFE) method to simulate the 2-D SHTE mode seismoelectric and electroseismic waves. By neglecting secondary weak wavefield feedbacks, SH TE waves are solved, separately. In finite plane region, propagations of both can be described as Helmholtz equation with boundary conditions, which is proved equivalent extremum functional by conducting calculus variation. The computation region partitioned into structured rectangular elements bilinear...
Abstract Deep Martian aquifers harboring liquid water could hold vital insights for current and past habitability. We show that with seismo‐electric interface responses (IRs) we can quantitatively characterize subsurface on Mars. Full‐waveform simulations sensitivity analyses across diverse aquifer scenarios demonstrate the technique's effectiveness. In contrast to how signals often appear Earth, Mars' desiccated surface naturally removes co‐seismic fields exposes useful IRs allow us several...
Abstract Quasi‐static electromagnetic (EM) approximation was frequently used in numerical modeling of the seismoelectric wavefields, but computational error it brings is unclear. In this study, we investigate caused by quasi‐static EM based on a horizontally layered model. With such an obtain simplified set Pride's equations and present analytically algorithm to solve responses explosive source. First, seismic wavefields ignoring influence converted fields propagation waves. Second, simplify...