This course is designed to introduce the basics of seismic refraction survey in terms of the relationship between the coefficients of elasticity and the speed of seismic waves, as well as the refraction survey method, its most important uses, advantages and disadvantages of survey, identifying the types of seismic waves and the importance of each of them, in addition to studying the types of different longitudinal wave paths and the relationships of the surface and time, the design of refraction field survey to identify the subsurface layers.
Intended learning outcomes
By studying the course, the student will be able to:
* Identify the basics of seismic refraction survey and physical factors affecting the values of the survey
* Identification of the relationship between the coefficients of elasticity and the speed of seismic waves
* Calculation of elasticity coefficients for rock samples in the laboratory
* Identify the types of seismic waves and the importance of each of them
* Study the different types of longitudinal wave trajectories and the relations of amplitude and time
* Design of the refractive field survey to identify the subsurface layers
* Study and identify deficiencies in refraction survey
Teaching and learning methods
1. Lectures
2. Solving various
problems and exercises
3. Training in
computer programs
Methods of assessments
1. The first half-exam
is 25% written
2. Second
half-examination is 25% written
3. 50% final written
exam
4. Success rate of 50%
and above
5. The total decision
estimate is 100%
Course contents
The first week introduces the components of the course, its requirements, and the evaluation method in terms of distributing grades for exams and assignments
The second and third weeks: stress and strain relationships with elasticity coefficients, the relationship of body velocities and elasticity coefficients, and analysis of some related issues.
The fourth week: Types of seismic waves and their most important properties and uses
The fifth week: Types of devices used in field surveys
The sixth week: Designing a field survey for different field conditions and applying it through assignments and practical work
The seventh week: Types of paths for direct and refracted body waves from two horizontal layers, analysis of problems (distance and time curves) in the laboratory, and assignments.
The eighth week, midterm evaluation
The ninth week: deducing distance and time equations for multiple classes (three or more classes) and analyzing practical problems and assignments.
The tenth week: A visit to one of the research centers to review the modern equipment and write a report on the visit whenever possible
The eleventh and twelfth weeks, studying the types of deficiencies in refractive scanning:
Its causes - the errors resulting from it - whether it can be treated or not (the first failure) a low-speed layer, the effect of the distance and time equation.
Field design - qualitative and quantitative interpretation - drawing and analyzing data and writing reports
The thirteenth week, the second deficiency: a thin layer - errors resulting from its presence, the possibility of treating it, and analyzing field data qualitatively and quantitatively.
The fourteenth week, the third palace: inclined layers, studying the field distribution (design) of different methods
Deducing the general equation of distance and time - the equation of the arrival time of refracted waves in the direction above the inclination and below the inclination (in the forward and opposite directions)
The fifteenth week: Inferring the values that define the subsurface layers - drawing data and analyzing it qualitatively and quantitatively for different field cases (practical and assignments)
