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  • Transient EM(TEM) method and common configurations

    2017-08-16 19:26:51

    What is Transient EM(TEM)? The principle of Transient E.M.(TEM) method of geophysical prospecting is very simply, that current flowing in a a transmitter loop sets up a magnetic field which when switched off induces eddy currents to flow in...[more]

  • DC Resistivity & Electrical Resistivity Tomography

    2017-08-16 19:26:02

    DC Resistivity Electrical Resistivity Tomography (ERT) Geoelectric model from a dipole-dipole resistivity survey for water resource study: lower resistivities between 90 and 100 meters indicate increased water content due to higher fracture...[more]

  • Electrical probing depth of ERT method

    2017-08-16 19:22:56

    Electrical probing depth  Exploration depth depends on the maximum length measurement arrangement, rather than depending on the length of the survey line. Scroll measure does not increase the depth of exploration.  In the number of ele...[more]

  • Electrode distance and resolution

    2017-08-16 19:22:22

    Electrode distance and resolution  Electrode spacing should be 2 to 4 times the minimum diameter of the study  Resolution of about half the distance of the electrodes  The higher electrode distance is smaller, high density electrica...[more]

  • How to read data after 2D imaging survey of WDA system by Res2DInv?

    2017-08-16 19:20:22

    The step as following: Down load data files (*.wda) to your computer, either laptop or desktop; 2.Run WDAFC.exe (which will be provided in the CD delivered with instrument), Click open WDA data file to convert button and in the prompted dia...[more]

  • 1D VES, 2D imaging survey and 3D ERT survey

    2017-08-16 19:18:36

    The greatest limitation of the resistivity sounding method is that it does not take into account horizontal changes in the subsurface resistivity. A more accurate model of the subsurface is a two-dimensional (2-D) model where the resistivit...[more]

  • Magnetic Susceptibility

    2017-08-16 19:18:09

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  • The difference of WTEM-2Q and WTEM-2

    2017-08-16 19:17:22

    WTEM-2Q Shallow Exploration System is applicable to shallow transient electromagnetic exploration, integrated with WTEM-2J TEM system receiver and WTEM-1X low-power transmitter. It features high transmitting power, short turn-off time, high...[more]

  • What is Gravity method?

    2017-08-16 19:15:28

    Gravity techniques measure minute variations in the earths gravity field. Based on these variations, subsurface density and thereby composition can be inferred. These variations can be determined by measuring the earths gravity field at num...[more]

  • What is Seismic survey?

    2017-08-16 19:14:05

    Seismic refraction and reflection methods measure the transmission of sound waves through the subsurface generated using a hammer blow or explosive energy source. Individual subsurface layer depths and thickness can be calculated based on t...[more]