Funded by major national scientific research and equipment development project, the development of multi-channel transient electromagnetic system is led by the Institute of Geology and Geophysics, Chinese Academy of Sciences. It consists of pseudo random coded waveforms and high power transmitter with...

We examine laboratory data from creep tests performed on a thermally cracked water-saturated glass sample and estimate Young's modulus and extensional-mode attenuation as functions of frequency. An SEM image of a vertical cross-section through the upper half of the cylindrical sample has been digitized...

The topography of the foreland thrust zone in western China is complicated. In those areas, the mountains are steep and the loess layer is thick, which cause the quality of seismic data in these areas is poor. With continuous research in recent years, the quality of seismic data has been improved to...

Geophysical methods are able to fill the gap between boreholes and to provide a measure of the spatial continuity of structures. Borehole seismic tomography promises the highest resolution when applied at a local scale of a few tens of meters. Currently, almost exclusively P-wave tomography is employed...

The mutual inductance coupling of the traditional multi-turn coils is relatively large, which makes the shallow "blind area" of the detection increase. Therefore, a conical field source device was proposed, and the calculation formula of the radius of each turn coil in the device was given. First of...

This paper proposed two new techniques to reduce the static shift effect in Controlled Source Audio-frequency Magnetotelluric (CSAMT) method in terms of image and signal, by applying Radon transform and Fourier transform, respectively, for data processing. The first method compensates for the static...

Besides the field acquisition of magnetotelluric is nearly 3D exploration level, the 3D data process and inversion have shortcomings. But our 3D inversion system has effectively resolved the problems of static shift and inversion efficiency. The system contains static shift correction, initial model...

Horizontal-to-vertical spectral ratio (HVSR) analysis and inversion were applied to S-waves from a large database of broadband seismic and strong-motion recordings. The S-wave HVSR, in comparison with ambient noise spectral ratio, contains much information on the shear-wave velocity structure. In other...

Based on the description of ground penetrating radar (GPR) data processing and interpretation, this programs solve the recognition and conversion of GPR original data and display the GPR field data. The programs eliminate the built-in post-processing software reliance on software dongle. The conversion...

As a critical component in electromagnetic exploration device, there are many issues in frequency domain electromagnetic transmitter to be addressed in the aspect of cover range of frequency points, operation efficiency under wild condition and high precision synchronization transmission as well as other...

For the first time used the international advanced level of plasma source, acquired seismic section with accuracy better than three meters even within 1 meter, lay the foundation for scientific research, engineering, shallow resources, geological disaster warning and other research. This paper for the...

In recent years, geophysical technology has been widely used in soil and groundwater investigation and remediation of contaminated sites assessments in Taiwan, such technology can securely work in either small or large sampler areas, and collect data from the traditional one-dimensional data to two-dimensional...

Surface-wave analysis methods have been effectively and widely used to determine shear (S) wave velocity. To separate and identify different dispersive modes of surface waves accurately is one of key steps using surface-wave methods. We analyze the dispersion energy of Rayleigh and Love waves based on...

Cross-well seismic has the characteristic of high resolution. It can solve the exploration problems of stratigraphic trap and lithological trap in small scale and complex structure. In order to solve the problems of cross-well seismic wave imaging effectively, the paper uses Gauss beam forward method...

Airborne electromagnetic method (AEM) as an efficient, regional geophysical electromagnetic method has been widely used in geological survey, mineral exploration, environmental monitoring and other fields, but not in China for the civil aviation law and the safety consideration. We introduce a new semi-airborne...

Electromagnetic transmitter is an important part of controlled source electromagnetic sounding system. To ensure that the receiver obtains a signal with high SNR (signal to noise ratio) at sufficiently large depth with high accuracy, a large power transmitter is required. In China and abroad, the high-power...

Straight-ray-based inversion technique to estimate attenuation rate from electromagnetic tomography in coal mine has been available to geophysicists for over twenty years. This method gives a good computational efficiency but not a satisfy resolution. On account of the increasing computational power,...

According to the seismic tomography, the lithosphere formation of Kazakhstan has a plume origin. Kazakhstan in the Paleozoic was a separate continent and consisted of three concentric rings of bounded geometry sutures. The rings under the active influence of mantle plume made vertical movement and their...

Ground-roll is a main type of strong noises in petroleum seismic exploration. In oil exploration, ground rolls are treated as some kind of noise contaminating the effective waves. The typical characteristics that enable us to separate surface waves from body waves lie in their difference in velocity...

Electromagnetic effect is a major disturbance of measured induced polarization data, and it seriously interferes with the induced polarization measurement and its application effect thus reducing the exploration depth. Therefore, to suppress and eliminate electromagnetic effects effectively is very important....

Underground mine gob area is a kind of potential geological disasters, this paper studies the formation and propagation of the Rayleigh-channel wave under the condition of existing mine gob area, using three-dimensional inhomogeneous isotropic medium wave equation and solving the elastic wave equation...

With seismic explorations developing quickly, traditional communicating technologies used in land seismic explorations expose more and more shortcomings. For example, conventional cable-based land exploration systems are very expensive, labor intensive and difficult to be laid down in complex terrain,...

Application fields of broadband seismometer determine that the settlements of the most instruments locate in remote areas in the wild. Especially as the broadband seismometers of scientific exploration networks and mobility observatory arrays are often unattended, and the field inspections of instruments...

The annual municipal water consumption in the Khartoum State is half milliard cubic meters from the River Nile plants and the drilled water supply wells. Sixty percent of this amount is derived from the groundwater sources. Examination of the drilling recorded data of over 2000 wells distributed all...

In recent years, tunnels and underground engineering are developing rapidly, and meanwhile the topography, complex geological conditions making interpretation difficult in case of ground penetrating radar. To solve this problem, we introduce a two-dimensional forward simulation method for ground penetrating...

The electromagnetic waves emitted by ground-penetrating radar (GPR) can show apparent dispersion, when they are trapped in thin interlayers whose relative permittivities are large enough. Those thin layers can act as a waveguide. The velocities and thicknesses of the surface waveguide layers and the...

The idea of developing a multifunction EM instruments implementing many ground EM methods with a common ideology of processing and interpreting the data has been held by geophysicists from the 1980s of the last century. At the turn of the 1980s and 1990s several companies (Phoenix, Zonge) managed to...

In the elastic impedance (EI) equation proposed by Connolly (1999), the relationship between the P-wave velocity " " and S-wave velocity " ", K=" "2/" "2, is assumed to be constant, which is not consistent with the statistical pattern between P- and S- wave velocities in real rocks, thus affecting the...

The forward modeling and inversion study on Controlled-Source Audio-Frequency Magnetotelluric method is very important to field work and interpretation of field data. One dimension forward modeling and inversion study has gotten lots of interest over the years and the technology has now been well developed....

In actual construction ,there existing a big error in GPS, the geophones embedded non-vertical ,azimuth has some deviation.However ,the position information of shot point and receiver point ,and the azimuthal angle information of 3D3C geophones determine the accuracy of seismic exploration final interpretation...

Tomography and surface-wave analysis are two established methods in seismic surveys and used successfully in near surface. Data acquisition, processing, and inversion of those two methods have been studied widely. Those two methods possess some different particular advantages respectively. We implemented...

Based on Maxwell equations with source terms, EM responses for infinite line source of 2-D symmetrical anisotropic formation in frequency domain are computed. The partial differential equation solutions based on a finite element method of electric field parallel to line source for TE mode and magnetic...