Geology and Earth Structure

A syncline is a fold in which the layers of rock are bent into a single, continuous trough.

In a normal fault, the hanging wall moves down relative to the footwall.

An asymmetric fold is a fold in which the layers of rock are bent into a series of parallel, alternating arches and troughs, but the axial planes are inclined.

Gravimetry is a geophysical technique that measures variations in the Earth's gravitational field to infer information about the subsurface density distribution and geological structures.

The seismic reflection method involves generating seismic waves and recording their reflections from subsurface layers to create images of geological structures.

Seismic refraction is a geophysical method that analyzes the refraction of seismic waves at subsurface boundaries to determine the velocity and depth of geological layers.

Gamma-ray spectrometry is a geophysical technique that measures the natural radioactivity of the Earth's materials to determine their elemental composition and identify radioactive isotopes.

Seismic tomography is a geophysical technique that uses seismic waves to create images of the Earth's internal structure, providing insights into geological formations and tectonic processes.

Ground-penetrating radar is a geophysical method that uses electromagnetic waves to image subsurface structures, commonly employed in archaeological surveys, environmental investigations, and utility mapping.

Magnetic resonance imaging is a geophysical technique that uses electromagnetic waves to image subsurface structures, commonly employed in archaeological surveys, environmental investigations, and utility mapping.

Well logging is a geophysical technique that involves measuring various physical properties of the Earth's subsurface, including temperature, electrical conductivity, and density, using instruments lowered into boreholes.

Electrical resistivity tomography is a geophysical technique that measures the electrical resistivity of the subsurface to create images of geological structures and identify variations in material properties.

Seismic refraction is a geophysical method that analyzes the refraction of seismic waves at subsurface boundaries to determine the velocity and depth of geological layers.

Earthquakes are primarily caused by the movement of tectonic plates along fault lines.

Surface waves, particularly Love and Rayleigh waves, cause the most damage during an earthquake due to their large amplitude and long duration.