23 mar 2015 · This method is based on the fact that the Bouguer anomaly depends on the density of rocks as well as on the topography If the topography along
Facts about a Geophysics degree: • In Canada, geoscience is a regulated profession The Major and Honours (4-year) Geophysics programs
Geophysics, we study earthquakes, the main magnetic field, physical oceanography, studies of the Earth's thermal state In fact to a good approximation
The purpose of this note is to seek to establish what geophysics is good and bad at and to give some information concerning the methods which are used
The fact is that physicists use to solve the problem in the frames of one method inside the so-called classical physics Currently the situation in science
provides the practical basis for nuclear geophysics is the fact that the geological properties of the materials are factors determining the characteristics
As a matter of fact, the magnetic method is the most appropriate tool especially when we are dealing with a Manganese mineralization, because it is usually
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PRINCIPLES OF GEOPHYSICS
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Albert Einstein
INTRODUCTIO
Geophysics
, Math Geophysics is the science which deals with investigating the Earth, using Exploration Geophysics, and Global Geophysics. In Global
Active Passive
Passive methods
natural occurring fields or properties of the earth. Ex. SP, Magnetotell
Active Methods
and then measure how the earth respond to the signal. Ex. DC. Resistivity, -
FUNDAMENTAL CONSIDERATIONS
- ±
THEORY OF ELASTICITY
Stress
Strainis the deformation caused in the body, and is expressed as the ratio of
Triaxial Stress
Stresses act along three orthogonal axes, perpendicular to faces of solid, e.g.
Pressure
Forces act equally in all directions perpendicular to faces of body, e.g. Change in volume of solid occurs. Associated with P wave propagation
Shear Stress
No change in volume. Fluids such as water and air cannot su Associated with S wave propagation.
Stresses on a solid in 3 dimensions
Stress F/
-
Shear stress (t) acting parallel to the surface
9 components of
For each body, it is possible to define 3
principal axes, and the principal stresses. pressure (lithostatic
Pressure = (s
Conventions for directions:
compression Stresses towards the tension(extension, dilatation) +RRNH¶V IMR +RRNH¶V IMR HVVHQPLMOO\ VPMPHV POMP VPUHVV LV SURSRUPLonal to strain. $P ORR PR PRGHUMPH VPUMLQV +RRNH¶V IMR MSSOLHV MQG M VROLG NRG\ LV said to behave At high strains: the At very high strains: a solid wil
Constant of proportionality is called the
KRXQJ¶V PRGXOXV
Elastic Moduli ( Constants )
(a) KRXQJ¶V 0RGXOXV (±
E = F / ADl / l
(±
DV / V
( c ) Shear Modulus Nj