1. Nature of Geophysics

Geophysics can be described as all of the following:

• An academic discipline – branch of knowledge that is taught and researched at the college or university level. Disciplines are defined (in part), and recognized by the academic journals in which research is published, and the learned societies and academic departments or faculties to which their practitioners belong.
• A scientific field (a branch of science) – widely recognized category of specialized expertise within science, and typically embodies its own terminology and nomenclature. Such a field will usually be represented by one or more scientific journals, where peer-reviewed research is published. There are several geophysics-related scientific journals.
  • A natural science – one that seeks to elucidate the rules that govern the natural world using empirical and scientific methods.
    • A physical science – one that studies non-living systems.
      • An earth science – one that studies the planet Earth and its surroundings.
  • A biological science – one that studies the effect of organisms on their physical environment.
• An interdisciplinary field – one that overlaps atmospheric sciences, geology, glaciology, hydrology, oceanography and physics.

2. Branches of Geophysics

• Biogeophysics – study of how plants, microbial activity and other organisms alter geologic materials and affect geophysical signatures.
• Exploration geophysics – the use of surface methods to detect concentrations of ore minerals and hydrocarbons.
• Geophysical fluid dynamics – study of naturally occurring, large-scale flows on Earth and other planets.
• Geodesy – measurement and representation of the Earth, including its gravitational field.
• Geodynamics – study of modes of transport deformation within the Earth: rock deformation, mantle convection, heat flow, and lithosphere dynamics.
• Geomagnetism – study of the Earth's magnetic field, including its origin, telluric currents driven by the magnetic field, the Van Allen belts, and the interaction between the magnetosphere and the solar wind.
• Mathematical geophysics – development and applications of mathematical methods and techniques for the solution of geophysical problems.
• Mineral physics – science of materials that compose the interior of planets, particularly the Earth.
• Near-surface geophysics – the use of geophysical methods to investigate small-scale features in the shallow (tens of meters) subsurface.
• Paleomagnetism – measurement of the orientation of the Earth's magnetic field over the geologic past.
• Seismology – study of the structure and composition of the Earth through seismic waves, and of surface deformations during earthquakes and seismic hazards.
• Tectonophysics – study of the physical processes that cause and result from plate tectonics.

3. History of Geophysics

History of geophysics

• History of geomagnetism
• Timeline of the development of tectonophysics
• Vine–Matthews–Morley hypothesis

4. General Geophysics Concepts

4.1. Gravity

Gravity of Earth

• Bouguer anomaly
• Isostatic gravity anomaly
• Geoid
• Geopotential
• Gravity anomaly
• Undulation of the geoid

4.2. Heat Flow

Geothermal gradient

• Internal heating

4.3. Electricity

Atmospheric Electricity

Atmospheric electricity

• Lightning
• Sprite (lightning)

Electricity in Earth

• Electrical resistivity tomography
• Induced polarization
• Seismoelectrical method
• Spectral induced polarisation
• Spontaneous potential
• Telluric current

4.4. Electromagnetic Waves

• Alfvén wave
• Dawn chorus (electromagnetic)
• Hiss (electromagnetic)
• Magnetotellurics
• Seismo-electromagnetics
• Transient electromagnetics
• Whistler (radio)

4.5. Fluid Dynamics

Geophysical fluid dynamics

• Isostasy
• Post-glacial rebound
• Mantle convection
• Geodynamo

4.6. Magnetism

Geomagnetism Subfields

• Environmental magnetism
• Magnetostratigraphy
• Paleomagnetism
• Rock magnetism

Earth's Magnetic Field

Description

• Geomagnetic pole
• Magnetic declination
• Magnetic inclination
• North Magnetic Pole
• South Magnetic Pole

Sources

• Geodynamo
• Magnetic anomaly
• Magnetosphere

Short-Term Changes

• Secular variation
• Geomagnetic secular variation
• Geomagnetic jerk

Long Term Behavior

• Apparent polar wander
• Geomagnetic excursion
• Geomagnetic pole
• Geomagnetic reversal
• Geomagnetic secular variation
• Polar wander
• True polar wander

Magnetostratigraphy

• Archaeomagnetic dating
• Polarity chron
• Magnetostratigraphy
• Superchron (currently redirected to Geomagnetic reversal#Moyero Reversed Superchron)

Rock Magnetism

Rock magnetism

• Magnetic mineralogy
• Natural remanent magnetization
• Saturation isothermal remanence
• Thermoremanent magnetization
• Viscous remanent magnetization

Tectonic Applications

• Plate reconstruction

Magnetic Survey

• Aeromagnetic survey
• Geophysical survey
• Magnetic survey (archaeology)
• Magnetometer

4.7. Radioactivity

• Age of the Earth
• Geochronology
• Radiometric dating

4.8. Mineral Physics

Mineral physics

• Creep
• Elasticity
• Melting
• Rheology
• Thermal expansion
• Viscosity

4.9. Vibration

Seismology

• Earthquake – a motion that causes seismic waves.

• Aftershock – follows larger earthquake.
• Blind thrust – along a thrust fault that does not show on the Earth's surface.
• Foreshock – precedes larger earthquake.
• Harmonic tremor – long-duration, with distinct frequencies, associated with a volcanic eruption.
• Interplate – at the boundary between two tectonic plates.
• Intraplate – in the interior of a tectonic plate.
• Megathrust – at subduction zones
• Remotely triggered earthquakes – after main shock but outside the aftershock zone.
• Slow – over a period of hours to months.
• Submarine – under a body of water.
• Supershear – rupture propagates faster than seismic shear wave velocity.
• Tsunami – triggers a tsunami.

• Seismic waves

• P
• S
• Surface

• Love
• Raleigh

• Reflection seismology
• Seismic refraction
• Seismic tomography
• Structure of the Earth

5. Closely Allied Sciences

5.1. Atmospheric Sciences

Atmospheric sciences

• Aeronomy – the study of the physical structure and chemistry of the atmosphere.
• Meteorology – the study of weather processes and forecasting.
• Climatology – the study of weather conditions averaged over a period of time.

5.2. Geology

Geology

• Mineralogy – the study of chemistry, crystal structure, and physical (including optical) properties of minerals.
• Petrophysics – The study of the origin, structure, and composition of rocks.
• Volcanology – the study of volcanoes, volcanic features (hot springs, geysers, fumaroles), volcanic rock, and heat flow related to volcanoes.

5.3. Engineering

• Geophysical engineering – the application of geophysics to the engineering design of facilities including roads, tunnels, and mines.

5.4. Water on the Earth

• Glaciology – the study of ice and natural phenomena that involve ice, particularly glaciers.
• Hydrology – the study of the movement, distribution, and quality of water on Earth and other planets.
• Physical oceanography – the study of physical conditions and physical processes within the ocean, especially the motions and physical properties of ocean waters.

6. Society

6.1. Influential Persons

List of geophysicists

6.2. Organizations

• American Geophysical Union
• Canadian Geophysical Union
• Environmental and Engineering Geophysical Society
• European Association of Geoscientists and Engineers
• European Geosciences Union
• International Union of Geodesy and Geophysics
• Royal Astronomical Society
• Society of Exploration Geophysicists
• Seismological Society of America

6.3. Publications

• Geophysics journals
• Important publications in geophysics (geology)
• Important publications in geophysics (physics)

7. Geophysics Lists

• Free geophysics software