Geophysics (correct answers)
Artificial nature of field correct answers e.g. seismic reflection and refraction, electrical
resistivity, induced polarization
Geophysics correct answers A subject of natural science concerned with the physical
processes and physical properties of the Earth and its surrounding space environment,
and the use of quantitative methods for their analysis.
Global geophysics correct answers Studies the structure of the Earth.
Petroleum geophysics correct answers Study the structures that trap oil.
Mining geophysics correct answers Studies the detection of ore bodies.
Groundwater studies correct answers depths and thicknesses
Site investigation correct answers Mechanical properties and depth
Contaminant studies correct answers Detection and flow direction
Geophysical anomaly correct answers It is detected when a survey encounters some
geometric perturbation in the distribution of a particular physical property in rocks.
Gravity anomaly correct answers Arises due to lateral perturbations in rock density,
magnetic ones are caused by lateral changes in rock magnetization, and seismic
anomalies indicate variations in acoustic impedance.
Signal correct answers It is the objective of the survey and is due to the causative or
target body.
Noise correct answers Anything else measured but which may not contain useful
information.
S/N ratio correct answers It is the utmost concern in geophysical surveys and an
important factor for measurement precision.
Natural nature of field correct answers e.g. gravity, magnetic, and spontaneous potential
Natural field noise correct answers These are fluctuating measurements such as
lightning strokes, magnetic storms, earthquakes, and typhoons.
Artificial field noise correct answers These are man-made structures such as power
lines, buried metal pipes, and metallic objects on the ground.
, Geologic noise correct answers It is due to the variable thickness of overburden,
presence of non-economical minerals in the overburden or overlying layers.
Ground correct answers It is a mode of applicability which is best applied to flat or
gently undulating terrain.
Airborne correct answers It is a mode of applicability for large or heavily forested areas.
Marine correct answers It is a mode of applicability for offshore investigations.
Borehole correct answers It is a mode of applicability which records one or more
physical properties as a function of depth.
Seismic method correct answers Travel times of reflected/ refracted seismic waves;
density and elastic moduli which determine the propagation velocity of seismic waves.
Gravity method correct answers Spatial variations in the strength of the gravitational
field of the Earth; density
Magnetic method correct answers Spatial variations in the strength of the geomagnetic
field; magnetic susceptibility and remanence
Electrical resistivity method correct answers Earth resistance; electrical conductivity
Induced polarization method correct answers Polarization voltages or frequency,
dependent ground resistance; electrical capacitance
Self-potential method correct answers Electrical potentials; electrical conductivity
Electromagnetic method correct answers Response to electromagnetic radiation;
electrical conductivity and inductance
Radar method correct answers Travel times of reflected radar pulses; dielectric constant
Fossil fuels correct answers The exploration of these, has the appropriate survey
methods such as Seismic, Gravity, Magnetic, and (Electromagnetic).
Metalliferous mineral deposits correct answers The exploration of these, has the
appropriate survey methods such as Magnetic, Electromagnetic, Electrical resistivity,
Self-potential, Induced-polarization, and Radiometric.
Bulk mineral deposits correct answers The exploration of these, has the appropriate
survey methods such as Seismic, (Electrical resistivity), and (Gravity).
Artificial nature of field correct answers e.g. seismic reflection and refraction, electrical
resistivity, induced polarization
Geophysics correct answers A subject of natural science concerned with the physical
processes and physical properties of the Earth and its surrounding space environment,
and the use of quantitative methods for their analysis.
Global geophysics correct answers Studies the structure of the Earth.
Petroleum geophysics correct answers Study the structures that trap oil.
Mining geophysics correct answers Studies the detection of ore bodies.
Groundwater studies correct answers depths and thicknesses
Site investigation correct answers Mechanical properties and depth
Contaminant studies correct answers Detection and flow direction
Geophysical anomaly correct answers It is detected when a survey encounters some
geometric perturbation in the distribution of a particular physical property in rocks.
Gravity anomaly correct answers Arises due to lateral perturbations in rock density,
magnetic ones are caused by lateral changes in rock magnetization, and seismic
anomalies indicate variations in acoustic impedance.
Signal correct answers It is the objective of the survey and is due to the causative or
target body.
Noise correct answers Anything else measured but which may not contain useful
information.
S/N ratio correct answers It is the utmost concern in geophysical surveys and an
important factor for measurement precision.
Natural nature of field correct answers e.g. gravity, magnetic, and spontaneous potential
Natural field noise correct answers These are fluctuating measurements such as
lightning strokes, magnetic storms, earthquakes, and typhoons.
Artificial field noise correct answers These are man-made structures such as power
lines, buried metal pipes, and metallic objects on the ground.
, Geologic noise correct answers It is due to the variable thickness of overburden,
presence of non-economical minerals in the overburden or overlying layers.
Ground correct answers It is a mode of applicability which is best applied to flat or
gently undulating terrain.
Airborne correct answers It is a mode of applicability for large or heavily forested areas.
Marine correct answers It is a mode of applicability for offshore investigations.
Borehole correct answers It is a mode of applicability which records one or more
physical properties as a function of depth.
Seismic method correct answers Travel times of reflected/ refracted seismic waves;
density and elastic moduli which determine the propagation velocity of seismic waves.
Gravity method correct answers Spatial variations in the strength of the gravitational
field of the Earth; density
Magnetic method correct answers Spatial variations in the strength of the geomagnetic
field; magnetic susceptibility and remanence
Electrical resistivity method correct answers Earth resistance; electrical conductivity
Induced polarization method correct answers Polarization voltages or frequency,
dependent ground resistance; electrical capacitance
Self-potential method correct answers Electrical potentials; electrical conductivity
Electromagnetic method correct answers Response to electromagnetic radiation;
electrical conductivity and inductance
Radar method correct answers Travel times of reflected radar pulses; dielectric constant
Fossil fuels correct answers The exploration of these, has the appropriate survey
methods such as Seismic, Gravity, Magnetic, and (Electromagnetic).
Metalliferous mineral deposits correct answers The exploration of these, has the
appropriate survey methods such as Magnetic, Electromagnetic, Electrical resistivity,
Self-potential, Induced-polarization, and Radiometric.
Bulk mineral deposits correct answers The exploration of these, has the appropriate
survey methods such as Seismic, (Electrical resistivity), and (Gravity).
