GEOL 412 Lecture Notes - Lecture 1: Earth Structure, Thermal Conductivity, Ground-Penetrating Radar

• School: College of Charleston
• Department: Geology and Environmental Geosciences
• Course: GEOL 412
• Professor: Jaume'

Document Summary

Equal volume of granite exerts more gravity than sandstone. Geophysical surveys and models help identify earth materials that aren"t visible. Seismic refraction & reflection: seismic waves are put into ground & time and amplitude of waves are measured. Dependent upon seismic velocity density(for reflection; similar to gravity) Seismic velocity interpreted in terms of earth material; seismic reflection interpreted in terms of earth structure (similar togpr) 3d seismic reflection. Earthquake & microtremor seismology: use natural & cultural sources of seismic waves; timing & amplitude measured. Dependent upon seismic velocity & density(as in exploration seismology) Seismic velocities are interpreted in terms of earth material & structure. Gravity: measure changes in the strength of the earth"s gravity field. Dependent upon density of earth materials (partially similar to seismic reflection) Strength of gravity field interpreted in terms of bodies of differing density; earth material & structure recovered. Magnetics: measure the strength & direction of magnetic field; both maps & time variation.