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Fundamentals of Geophysical Exploration I

Code: 45518
ECTS: 4.0
Lecturers in charge: prof. dr. sc. Franjo Šumanovac - Lectures
Lecturers: Nataša Balaša - Exercises
Take exam: Studomat
Load:

1. komponenta

Lecture typeTotal
Lectures 30
Exercises 30
* Load is given in academic hour (1 academic hour = 45 minutes)
Description:
Lectures :
Gravimetric researches - Theoretical basis. Gravimeter. Gravimetric effect of 3D structures. Instruments and equipment. Field measurements and data processing. Gravimetric correction. Transformation of gravimetric maps. Rock densities. Interpretation. Gravimetric ambiguity. Isostasy. Application of gravimetric surveys.
Magnetic researches - Earth's magnetic field. Instruments and equipment. Measuring the total field. Theoretical foundations. Magnetic minerals and rocks. Elementary dipoles and monopoles. Induced and remanent magnetization. Field measurements. Use of the protone magnetometer. Data processing. Interpretation. Magnetometric ambiguity. Application of magnetic researches. Geoelectric researches - Electrical properties of rocks. Self - potential method. Electrical resistivity method. Electrical sounding and profiling: instruments and equipment. Measuring, data processing, interpretation. Electrical ambiguity. Application of geoelectrical researches. Induced polarization method.
Exercises:
Defining 3 exercises. Explanations related to preliminary exams and field work. Gravimetry - Introduction. Interpolation of values on Bouguer anomaly maps. Transformation of Bouguer anomaly maps using Griffin method. Calculation of residuals for different radiuses. Interpolation of calculated values on the map of gravimetric residuals for different radiuses. Magnetometry - Introduction. Defining the profile on the geomagnetic maps. Defining the cause of anomaly. Tangents methods - horizontal gradient Method of tangents - Peter´s method, tangent-intersection method. Calculating the depth of the anomaly cause. Geoelectric sounding - Introduction. Calculating the apparent resistivity for two layers Interpretation of depth distribution of resistivity for two layers using theoretical curves. Calculating the apparent resistivity for several layers. Interpretation of depth distribution of resistivity for multiple layers, using theoretical curves. Interpretation of depth distribution of resistivity for multiple layers, using theoretical curves. Field work - Geoelectrical sounding, geoelectrical profiling, Magnetometry.

LEARNING OUTCOMES:
To understand gravimetric regional and residual; define the depth of the causes of magnetic anomalies with tangents methods; to calculate and interpret the curve of geoelectric sounding; to understand the operation of instruments for gravimetric, magnetic and electrical surveys.
Literature:
  1. Šumanovac, F. (2012): Osnove geofizičkih istraživanja, Sveučilište u Zagrebu.
  2. Parasnis, D.S. (1986): Principles of Applied Geophysics, Chapman and Hall, New York.
  3. Griffits, D.H. & King, R.F. (1981): Applied Geophysics for Engineers and Geologists, Pergamon Press, Oxford.
2. semester
Izborni predmeti - Mandatory smjer - Seismology and Physics of Solid Earth
Consultations schedule: