Seismic and wave field exploration and laboratory

A.A. 2024/2025
9
Crediti massimi
84
Ore totali
SSD
GEO/11
Lingua
Inglese
Learning objectives
Non definiti
Expected learning outcomes
Non definiti
Corso singolo

Questo insegnamento può essere seguito come corso singolo.

Course syllabus and organization

Edizione unica

Responsabile
Periodo
Secondo semestre

Programma
· Basic principles of wave field exploration: wave equation and wave propagation; impedance contrast and reflection/transmission coefficients; Impulse response and Green's theorem; reflectivity and convolutional model for synthetic traces; Fourier transform, convolution, correlation, autocorrelation and related properties; minimum phase wavelets and their properties; sampling rate, aliasing and Nyquist theorem.
· Acquisition of seismic data: impulsive sources and vibroseis; geophones and hydrophones; attenuation processes; acquisition layout in reflection seismic, multi-fold acquisition, common-mid-point (CMP) gathers; acquisition layout in refraction seismic and surface wave analysis.
· Construction of reflection seismic sections: gain correction; deconvolution; frequency-domain filtering and F-K analysis; static corrections; velocity analysis and Normal Moveout correction; stack and zero-offset sections; basic migration concepts and applications.
· Analysis of refraction and surface wave seismic data: traveltimes for horizontal and dipping layers; intercept times and plus-minus method (Generalized Reciprocal Methods); principles and measurement procedures in Multichannel analysis of surface waves (MASW) and Horizontal-to-vertical spectral ratio (HVSR).
· Georadar: similarities and differences between seismic and electromagnetic wave propagation; application of reflections seismic methods for the analysis of georadar data.
Prerequisiti
Physics: knowledge of mechanics and electromagnetism. Mathematics: differential equations, complex numbers, Fourier analysis.
Metodi didattici
Theoretical lectures and practical exercises in python/Matlab, with implementation of simple processing and visualization scripts.
Materiale di riferimento
· Methods of Seismic Data Processing, Gary F. Margrave (https://www.crewes.org/ResearchLinks/FreeSoftware/)
· Numerical Methods of Exploration Seismology with algorithms in MATLAB, Gary F. Margrave (https://www.crewes.org/ResearchLinks/FreeSoftware/)
· Seismic data analysis, Oz Yilmaz, investigation in geophysics no.10, SEG
Modalità di verifica dell’apprendimento e criteri di valutazione
Exam method: oral. Evaluation criteria: understanding of the physical principles of the methods and their applicability; critical reasoning and evaluation of data/processing steps; skill in the use of specialist lexicon.
The final score will be expressed in thirtieth.
GEO/11 - GEOFISICA APPLICATA - CFU: 9
Esercitazioni: 36 ore
Lezioni: 48 ore