A5100663958- Geophysical Methods and Applications
- Geophysical and Geoelectrical Methods
- Seismic Waves and Analysis
- Geological and Geochemical Analysis
- Geochemistry and Geologic Mapping
- Remote Sensing and Land Use
- High-pressure geophysics and materials
- Hydrocarbon exploration and reservoir analysis
- Seismic Imaging and Inversion Techniques
- Climate change and permafrost
- earthquake and tectonic studies
- Arctic and Antarctic ice dynamics
- Earthquake Detection and Analysis
- Cryospheric studies and observations
- Industrial Technology and Control Systems
- Environmental and Agricultural Sciences
- Geochemistry and Elemental Analysis
- Geoscience and Mining Technology
- Non-Destructive Testing Techniques
- Advanced Algorithms and Applications
- Machine Fault Diagnosis Techniques
- Coastal and Marine Dynamics
- Environmental Changes in China
- Underwater Acoustics Research
- Advanced Sensor and Control Systems
Institute of Geology and Geophysics
2015-2024
Chinese Academy of Sciences
2015-2024
University of Chinese Academy of Sciences
2016-2024
Xi'an Shiyou University
2022-2023
Chang'an University
2018-2020
China Geological Survey
2019
National Marine Environmental Forecasting Center
2014
Chinese University of Hong Kong
2013
University of Hong Kong
2013
Zhejiang University
2012
Transient electromagnetic method (TEM) is a geophysical tool to obtain resistivity distribution in the subsurface. Combining with property of typical rocks, TEM can make inferences geological maps underground. The inversion main technique extract form recorded data. There are various methods that have been applied data, each which favors different model structures. It essential choose optimal algorithm for survey given setting. Thus, this article presents systematic summary recent...
Chargeable materials in the mining industry cause induced polarization (IP) phenomenon when exposed to an electromagnetic field, which affects response transient (TEM) surveys. This distortion of TEM data is a challenge for traditional inversion methods, typically focus on resistivity and may fail provide reliable results IP effects are significant. To address this limitation, paper introduces Bayesian framework that incorporates full dispersive resistivity, using Cole-Cole model simulate...
Although the loop-source TEM near-field survey system has been widely used, this method still cannot meet demand for large-area 3D data acquisition and fine probing of deep ore bodies. Based on advantage survey, a new configuration called short-offset with grounded wire-source (named SOTEM by authors) proposed detecting technique studied to solve problem underground targets at high resolution. Analysis detection capability such as time-domain response well investigation depth suggests that...
The in-loop transient electromagnetic (TEM) method has been widely used for reliable investigation of mined-out areas the subsurface. However, limited applications in mountainous coalfields that are often covered with tall vegetation: first, it requires extra work to clear surface and set up TEM equipment; more importantly, dense vegetation restricts required layout a standard rectangular loop, such geometry irregularity can decrease detection accuracy. This study proposes using short-offset...
Transient electromagnetic method (TEM) is one of the major tools to image subsurface resistivity. The gradient-based inversion TEM data only provides a unique solution using subjectively defined regularization penalty, leaving uncertainty unaddressed. Bayesian can be used estimate model parameters, as well quantify their uncertainty. However, it requires far higher computational costs than inversion, which limits 1-D assumptions. We propose an accelerated based on Markov chain Monte Carlo...
Transient electromagnetic method (TEM) is an important tool for mapping the subsurface resistivity. As fields with different frequencies reach depth of Earth, resolution TEM closely related to spectrum properties its source signal. The pseudorandom binary sequence (PRBS) a recently applied signal and thought be superior conventional square wave adjustable frequency range density. However, invert response from this optimized source, pure secondary field needs extracted full waveform in which...
The land-based controlled-source electromagnetic (CSEM) method is an important tool in mapping subsurface resistivity contrast, especially for conductive target embedded a resistive environment. For targets on land, choosing appropriate configuration to specific field observation quite confusing, due the lack of systematic comparisons different methods. We have conducted comparison between broadside and inline time-domain CSEM methods, using short-offset transient (SOTEM) multitransient...
We have developed a scheme for decoupling the induced polarization (IP) effect from time-domain electromagnetic (TDEM) data. This is achieved by simultaneously sampling resistivity and pseudochargeability in Bayesian framework. The TDEM IP responses are simulated separately with sampled model parameters then stacked to fit IP-affected Thus, influence of phenomenon eliminated process recovering resistivity. To reduce computational cost brought sampling, we use 2D parametrization instead full...
Conventional use of the controlled-source audio-frequency magneto-telluric (CSAMT) method is based on calculating apparent or Cagniard resistivity from amplitude ratio horizontal electric and magnetic field components. However, direct comparison between these two components shows that more sensitive to underground medium than its counterpart. Thus, component only should provide adequate information about properties subsurface. The measurements typically belong far-field zone, but show a...
Seamount chains (oceanic plateaus, submarine ridges) are unique morphologic features on the seafloor, which resulted from motion of lithosphere over a convective plume. being carried along by plate motions, eventually subducted beneath continental/oceanic plates or accreted in accretionary complex, thus causing series effects convergent margin. In this paper, we briefly review distribution and typical modern seamount chains, including Hawaiian‐Emperor Louisville Cocos, Ninetyeast Caroline...
Abstract Geologic and geochemical results from the Ni-Cu deposits of Central Asian orogenic belt show that carbon carbonaceous sediments was incorporated in magma formed deposit. Thus, presence an deposit may be hypothesized at localities where are contact with mafic intrusions. However, widely developed layer has low-resistivity high-chargeability characteristics similar to those massive semimassive orebodies, which makes it difficult detect by conventional geophysical methods. To test...