Università Roma Tre

Surface forces and volume forces. Traction vector or strain vector.

Traction applied to a free body. Cauchy's relation and Cauchy's tetrahedron. Stress tensor property. Diagonalization of stress matrix

Principal axes and planes. Principal stresses. Invariantes. Maximun shear stesses. Spherical, deviatory, hydrostatic, lithostatic stress.

The tensor deformation. The antisymmetric tensor of rigid rotations. Principal deformations. Dilatation. Relationships between stress and

deformation. Constitutive equations.



Rheological function. Linear elasticity. Hooke's Law

Generalized. Hooke's law for homogeneous and isotropic media. Duhamel-Neumann equations.

Stress-dependent rheological function, deformation and time. Linear viscoelasticity.

Time-deformation. Boltzmann Linear Solids with Memory Mechanism. Constitutive equations. Boltzmann's Integral-Differential Equation.

Creep and relaxation functions, complex module and quality factor. Linear viscoelastic models of Maxwell, Kelvin-Voigt, SLS.



Dynamic theory of elasticity. Elastic waves. Helmholtz-Lamé's elastic potential and theorem. Plane and Spherical waves. Horizontal and vertical slowness. Volume waves. Waves P, S, SH, SV. Phase velocity and Group velocity. Partition and conversion of seismic energy to a surface of discontinuity. Reflection and transmission coefficients. Geometric spreading. Attenuation and scattering of a seismic wave. Surface Waves. Rayleigh and Love Waves.

Dispersion of surface waves. Equation and dispersion curve. Fundamental and overtones mode.

Free oscillations of the Earth. Spheroidal and toroidal (or torsional) modes.



Seismology and earth structure. Refraction seismology. Reflection seismology. Travel times. Travel times

In a layered Earth. Direct waves, head wave,

Reflected wave, diffracted wave. Shadow zones. Dromocron.

Seismic waves in a spherical earth.



Short and long-term seismometers. Seismograms and their interpretation.

Determination of the epicenter. Volume waves nomenclature. Determination of

Hypocentric parameters. The inverse problem. Origin Time.

The Seismic Source: radation pattern and Focal Mechanism.

Seismic: focal point and focal mechanism.

Seismic Moment and Magnitude.

Determination of the seismic moment. Earthquake magnitude. Local magnitude, for volume waves, for the

Superficial waves. Saturation of magnitude scales. Seismic energy and magnitude momentum.

- An introduction to seismology: earthquakes and earth structure. Stein and Wysession. Blakwell publishing.

- Terremoti e onde. Metodi e pratica della sismologia moderna. Zollo e Emolo. Liguori.

- Modern global seismology. Lay Thorne AND Terry C. Wallace. Vol. 58. Elsevier, 1995.