Physical Properties

In geophysics, materials are differentiated based on their physical properties. Physical properties characterize how materials respond to various physical inputs. For example, if I send sound waves through this material, how quickly does the signal propagate? How effective is this material at conducting electricity? Can I magnetize this material by applying a magnetic field? Sufficient understanding of material physical properties is ultimately paramount, as this information can be used to choose the optimum survey method for a given geophysical/geotechnical/geological problem.

As part of the GPG, we will focus on the following physical properties: density, magnetic susceptibility and permeability, seismic velocity, dielectric permittivity, electrical conductivity/resistivity and chargeability. For each physical property:

• Relevant quantities are defined.

• We explain how the physical property can be measured.

• Physics associated with the physical property are explained.

• A common range of values for rocks and materials is provided.

• Factors impacting the physical property are explained.

Contents:

• Density
• Susceptibility
• Seismic Velocity
• Dielectric Permittivity
• Electrical Conductivity
• Chargeability
• Tables of Physical Properties