Geophysical prospecting - KAGG6M16

Goal(s)

Geophysical prospecting uses the laws of physics to obtain information on the structure of the subsoil. The course aims to provide students with the basics of geophysical prospecting for the recognition of surface structures (up to 100 m deep). After a general introduction and training in signal processing concepts, the course reviews the main methods used in geotechnics: seismic refraction, electrical methods, gravimetry, magnetism and electro-magnetic methods.
Emphasis is placed on understanding the advantages and limitations of geophysical prospecting methods and the recognition strategy to be implemented in conjunction with geotechnical techniques and geological data

Content(s)

I. INTRODUCTION
I.1. Principle
I.2. Classification of geophysical methods
I.3. Characteristics
I.4. Applications
II. SIGNAL PROCESSING
II.1 Introduction
II.2 Fourier transform
II.3 Sampling
II.4 Filtering
III. SEISMIC METHODS
III.1. Wave propagation
III.2. Instrumentation
III.3. Seismic refraction
III.4. Seismic reflexion
IV. Electrical methods
IV.1. Fundamental equation
nIV.2. Resistivity method
IV.3. Induced Polarization
IV.4. Spontaneous Polarization
V. Gravity surveying
V.1. Gravitational law
IV.2. Measurements and corrections
IV.3. Interpretation
IV.4. Applications
VI. MAGNETIC SURVEYING
IV.1. Fundamental equation
IV.2. Measurements
IV.3. Interprétation
IV.4. Applications
VII. ELECTROMAGNETIC METHODS
VII.1. Basic concepts
VII.2. Frequency-domain methods
VII.3. Time-domain methods

No prerequisites. This course precedes the geophysical imaging course given in GGC4. It is associated with a field reconnaissance day during which the main methods are applied, in conjunction with in-situ geotechnical methods.