# geophysics

> study of physical processes and phenomena occurring in the Earth and in its vicinity, and of their characteristics

**Wikidata**: [Q46255](https://www.wikidata.org/wiki/Q46255)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Geophysics)  
**Source**: https://4ort.xyz/entity/geophysics

## Summary
Geophysics is the scientific study of physical processes and phenomena occurring in the Earth and in its vicinity, including their characteristics. It is a branch of Earth science that applies principles of physics to understand planetary dynamics, seismic activity, and the Earth's internal structure. This field is essential for understanding natural hazards, resource exploration, and planetary evolution.

## Key Facts
- Geophysics is classified as a branch of Earth science, physics, and planetary science.
- It includes several subfields such as seismology, geomagnetism, tectonophysics, geodynamics, and exploration geophysics.
- Geophysics is both an academic discipline and a branch of science with applications in economic geology and space research.
- The field has over 95 sitelinks, indicating its widespread recognition and use.
- Notable subdisciplines include biogeophysics, actinometry, and geothermy.
- Geophysics intersects with space science through institutions like the Lunar and Planetary Institute.
- Key historical figures include Emil Wiechert, Edward Bullard, Andrey Tikhonov, and Edmond Halley.
- The field has contributed to major scientific breakthroughs, including the development of ground-penetrating radar and seismic tomography.
- Geophysics is taught as an academic major and practiced as a profession in both academic and industrial settings.
- It is foundational to understanding Earth's structure, natural hazards, and resource distribution.

## FAQs
### What is geophysics?
Geophysics is the study of physical processes and phenomena occurring in the Earth and its vicinity. It involves the application of physics to understand the Earth's structure, dynamics, and related phenomena such as earthquakes, magnetism, and heat flow.

### What are the main branches or subfields of geophysics?
Key subfields include seismology, geomagnetism, tectonophysics, geodynamics, exploration geophysics, actinometry, and biogeophysics. Each focuses on specific aspects such as seismic activity, magnetic fields, tectonic processes, and Earth's thermal properties.

### How is geophysics related to other scientific fields?
Geophysics is part of Earth science, physics, and planetary science. It overlaps with meteorology, oceanography, and space science, and is applied in economic geology and planetary research.

### What are some practical applications of geophysics?
Geophysics is used in natural hazard assessment (e.g., earthquake prediction), resource exploration (e.g., oil and mineral detection), and planetary science. It also contributes to understanding climate systems and the Earth's internal structure.

### Who are some notable geophysicists?
Notable figures include Emil Wiechert, Edward Bullard, Edmond Halley, Alexander Gerst, John Tuzo Wilson, Andrija Mohorovičić, and Hiroo Kanamori. These individuals have made significant contributions to seismology, planetary science, and geodynamic theory.

### What organizations or institutions are associated with geophysics?
Institutions such as the Lunar and Planetary Institute and companies like Petroleum Geo-Services are involved in geophysical research. Research centers like GeoSphere Austria also contribute to the field.

### Is geophysics taught as an academic subject?
Yes, geophysics is an academic discipline and is offered as an academic major in many universities. It is also a profession with dedicated researchers and practitioners.

### What tools or methods are used in geophysics?
Methods include seismic tomography, ground-penetrating radar, and magnetic field analysis. These tools help in mapping subsurface structures and understanding Earth's interior.

### What are some historical milestones in geophysics?
Key milestones include the development of the Richter scale by Charles Francis Richter, the discovery of the Mohorovičić discontinuity by Andrija Mohorovičić, and the invention of ground-penetrating radar by John Call Cook.

### What is the relationship between geophysics and planetary science?
Geophysics is a core component of planetary science, helping to understand the physical properties and processes of other planets and celestial bodies, often in collaboration with space agencies and research programs like NASA's Explorers Program.

## Why It Matters
Geophysics is crucial for understanding the Earth's internal structure, predicting natural disasters like earthquakes and volcanic eruptions, and locating natural resources such as oil, gas, and minerals. It plays a foundational role in planetary science, contributing to our knowledge of other celestial bodies. The field also supports climate science, oceanography, and engineering applications, making it integral to both academic research and industrial innovation. Its methods and findings are essential for hazard mitigation, resource management, and space exploration.

## Notable For
- Being foundational to the study of planetary processes and Earth's structure.
- Development of seismic tomography and ground-penetrating radar.
- Contributions to major scientific institutions and space research programs.
- Influential figures like Edward Bullard, Andrija Mohorovičić, and Edmond Halley.
- Integration with economic geology and space science.
- Academic recognition as both a discipline and a profession.
- Application in hazard prediction and resource exploration.
- Cross-disciplinary relevance in meteorology, oceanography, and climatology.

## Body

### Definition and Scope
Geophysics is defined as the study of physical processes and phenomena occurring in the Earth and in its vicinity, including their characteristics. It is a multidisciplinary field that combines elements of physics, Earth science, and planetary science. As a branch of science, it is concerned with understanding the physical properties and dynamics of the Earth and nearby celestial bodies.

### Classification and Relationships
Geophysics is part of:
- **Earth science**: A broad category of scientific fields dealing with planet Earth and nearby planets.
- **Physics**: The study of matter, motion, energy, and force.
- **Planetary science**: The science of planets and astronomical objects in orbit around stars.
- **Academic discipline**: Recognized as a formal field of study and profession.
- **Branch of science**: Categorized under scientific study fields.

It includes subfields such as:
- **Geothermy**: A branch of geophysics.
- **Dynamic geology**: Deals with the causes and processes of geologic phenomena.
- **Geodynamics**: Focuses on Earth's dynamics.
- **Seismology**: The scientific study of earthquakes.
- **Actinometry**: A branch of geophysics and meteorology.
- **Exploration geophysics**: Applied branch used in economic geology.
- **Tectonophysics**: The study of physical processes underlying tectonic deformation.
- **Geomagnetism**: Concerned with Earth's magnetic field.
- **Biogeophysics**: A subdiscipline of geophysics.

### Key Figures in Geophysics
Many notable individuals have shaped the field:
- **Emil Wiechert** (1861–1928): German geophysicist and seismologist.
- **Edward Bullard** (1907–1980): British geophysicist.
- **Alexander Gerst**: German ESA astronaut and geophysicist.
- **Edmond Halley** (1656–1742): English astronomer and geophysicist.
- **Andrija Mohorovičić** (1857–1936): Croatian seismologist, known for discovering the Mohorovičić discontinuity.
- **John Tuzo Wilson** (1908–1993): Canadian geologist and geophysicist.
- **Hiroo Kanamori**: Japanese seismologist.
- **Charles Francis Richter**: Developer of the Richter scale.
- **John Call Cook** (1918–2012): Developer of ground-penetrating radar.
- **Xavier Le Pichon**: French geophysicist known for contributions to plate tectonics.

Other significant contributors include:
- **Naomi Oreskes**, **Robin Bell**, **Anny Cazenave**, **Mark D. Zoback**, **H. Jay Melosh**, **Boris Galitzine**, **Arthur Louis Day**, and **Alfred de Quervain**.

### Institutions and Organizations
Several institutions and organizations are associated with geophysics:
- **Lunar and Planetary Institute**: Based in Houston, United States, established in February 1978.
- **Petroleum Geo-Services**: A company based in Norway, established in 1991, involved in geophysical services for the oil and gas industry.
- **GeoSphere Austria**: Formerly known as the Central Institute for Meteorology and Geodynamics, established in 1851 in Austria.

### Applications and Methods
Geophysics employs various methods to study Earth's physical properties:
- **Tomography**: Imaging by sections using penetrative waves.
- **Seismic methods**: Including the development of ground-penetrating radar.
- **Magnetic field analysis**: Studying Earth's geomagnetism.
- **Thermal analysis**: Understanding geothermal processes.

### Academic and Professional Context
Geophysics is both:
- An **academic discipline** with dedicated study and research programs.
- A **branch of science** with over 95 sitelinks, indicating its widespread recognition.
- An **academic major** offered in universities globally.
- A **profession** with practitioners in both academic and industrial sectors.

### Historical Milestones
Key milestones in geophysics include:
- The development of the Richter scale by Charles Francis Richter.
- The discovery of the Mohorovičić discontinuity by Andrija Mohorovičić.
- The invention of ground-penetrating radar by John Call Cook.
- Contributions to space exploration through programs like NASA's Explorers Program.

### Interdisciplinary Connections
Geophysics intersects with:
- **Meteorology** through actinometry and atmospheric studies.
- **Oceanography** through the work of individuals like Walter Munk.
- **Climatology** through figures like Mikhail Budyko and Hans Oeschger.
- **Astronomy** through historical figures like Edmond Halley and contemporary researchers like Jean Jacques Dortous de Mayran.

### Notable Subfields and Specializations
- **Biogeophysics**: A subdiscipline of geophysics.
- **Actinometry**: A branch shared with meteorology.
- **Exploration geophysics**: Applied in economic geology.
- **Tectonophysics**: Study of tectonic deformation.
- **Geomagnetism**: Study of Earth's magnetic field.
- **Seismology**: Study of earthquakes.

### Contributions to Science and Industry
Geophysics has contributed to:
- Understanding Earth's structure and dynamics.
- Predicting and mitigating natural hazards.
- Locating and managing natural resources.
- Advancing planetary science and space exploration.
- Developing tools like seismic tomography and ground-penetrating radar.

### Conclusion
Geophysics is a foundational and interdisciplinary field that bridges Earth science, physics, and planetary science. Its methods and findings are essential for understanding the Earth's physical processes, predicting natural hazards, and exploring other planets. With a rich history of innovation and a strong presence in both academia and industry, geophysics continues to play a critical role in scientific and technological advancement.

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