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Geophysics is a subject of natural science concerned with the physical processes and physical properties of the Earth and its surrounding space environment, and the use of quantitative methods for their analysis. The term geophysics sometimes refers only to solid earth applications: Earth's shape; its gravitational and magnetic fields; its internal structure and composition; its dynamics and their surface expression in plate tectonics, the generation of magmas, volcanism and rock formation. However, modern geophysics organizations and pure scientists use a broader definition that includes the water cycle including snow and ice; fluid dynamics of the oceans and the atmosphere; electricity and magnetism in the ionosphere and magnetosphere and solar-terrestrial physics; and analogous problems associated with the Moon and other planets.
Reflection seismology is a method of exploration geophysics that uses the principles of seismology to estimate the properties of the Earth's subsurface from reflected seismic waves. The method requires a controlled seismic source of energy, such as dynamite or Tovex blast, a specialized air gun or a seismic vibrator. Reflection seismology is similar to sonar and echolocation. This article is about surface seismic surveys; for vertical seismic profiles, see VSP.
Don Lynn Anderson was an American geophysicist who made significant contributions to the understanding of the origin, evolution, structure, and composition of Earth and other planets. An expert in numerous scientific disciplines, Anderson's work combined seismology, solid state physics, geochemistry and petrology to explain how the Earth works. Anderson was best known for his contributions to the understanding of the Earth's deep interior, and more recently, for the plate theory hypothesis that hotspots are the product of plate tectonics rather than narrow plumes emanating from the deep Earth. Anderson was Professor (Emeritus) of Geophysics in the Division of Geological and Planetary Sciences at the California Institute of Technology (Caltech). He received numerous awards from geophysical, geological and astronomical societies. In 1998 he was awarded the Crafoord Prize by the Royal Swedish Academy of Sciences along with Adam Dziewonski. Later that year, Anderson received the National Medal of Science. He held honorary doctorates from Rensselaer Polytechnic Institute and the University of Paris (Sorbonne), and served on numerous university advisory committees, including those at Harvard, Princeton, Yale, University of Chicago, Stanford, University of Paris, Purdue University, and Rice University. Anderson's wide-ranging research resulted in hundreds of published papers in the fields of planetary science, seismology, mineral physics, petrology, geochemistry, tectonics and the philosophy of science.
Francis Muir is a former research associate at the Geophysics Department of Stanford University. Muir graduated from Oxford University in 1950 with an MA degree in mathematics.
The Stanford Exploration Project (SEP) is an industry-funded academic consortium within the Geophysics Department at Stanford University. SEP research has contributed greatly to improving the theory and practice of constructing 3-D and 4-D images of the earth from seismic echo soundings. The consortium was started in the 1970s by Jon Claerbout and is currently co-directed with Biondo Biondi.
Seismic Unix is an open source seismic utilities package which was supported by the Center for Wave Phenomena (CWP) at the Colorado School of Mines (CSM). Currently it is supported by John Stockwell.
John Clarence Karcher was an American geophysicist and businessman. He invented and eventually commercialized the reflection seismograph, applying for patents in 1919. By the patenting, and development of reflection seismography, he created the means by which most of the world's oil reserves have been discovered. In 1930 he, Eugene McDermott, and Everette Lee DeGolyer founded Geophysical Service Incorporated, a pioneering provider of seismic exploration services to the petroleum industry that focused on reflection seismology.
Andrew S. Long is an Australian geophysicist. He has a PhD in geophysics (1996) from the University of Western Australia, and a post-doctoral term at Stanford University. He is a leader in the application of geophysical technologies to exploration for oil and gas in marine areas, and has written and presented several papers at the Society of Exploration Geophysicists (SEG), the European Association of Geoscientists and Engineers (EAGE), the Australian Society of Exploration Geophysicists (ASEG), the Australian Petroleum Production & Exploration Association (APPEA) and many other international conventions and journals.
Two international geophysical societies offer awards each year which are named in honor of Maurice Ewing; these are the American Geophysical Union and the Society of Exploration Geophysicists:
Interferometry examines the general interference phenomena between pairs of signals in order to gain useful information about the subsurface. Seismic interferometry (SI) utilizes the crosscorrelation of signal pairs to reconstruct the impulse response of a given media. Papers by Keiiti Aki (1957), Géza Kunetz, and Jon Claerbout (1968) helped develop the technique for seismic applications and provided the framework upon which modern theory is based.
Madagascar is a software package for multidimensional data analysis and reproducible computational experiments. Its mission is to provide
Near-surface geophysics is the use of geophysical methods to investigate small-scale features in the shallow subsurface. It is closely related to applied geophysics or exploration geophysics. Methods used include seismic refraction and reflection, gravity, magnetic, electric, and electromagnetic methods. Many of these methods were developed for oil and mineral exploration but are now used for a great variety of applications, including archaeology, environmental science, forensic science, military intelligence, geotechnical investigation, treasure hunting, and hydrogeology. In addition to the practical applications, near-surface geophysics includes the study of biogeochemical cycles.
The following outline is provided as an overview of and topical guide to geophysics:
Öz Yilmaz is the Chief Technology Officer of GeoTomo LLC and the founder of Anatolian Geophysical. He is the author of Seismic Data Processing and Seismic Data Analysis, the principle reference volumes for the seismic processing industry.
Vijay Prasad Dimri is an Indian geophysical scientist, known for his contributions in opening up a new research area in Earth sciences by establishing a parallelism between deconvolution and inversion, the two vital geophysical signal processing tools deployed in minerals and oil and gas exploration. In 2010, the Government of India awarded him with the Padma Shri, India's fourth highest civilian award, for his contributions to the fields of science and technology.
Robert E. Sheriff was an American geophysicist best known for writing the comprehensive geophysical reference, Encyclopedic Dictionary of Exploration Geophysics. His main research interests included the seismic detailing of reservoirs, in 3-D seismic interpretation and seismic stratigraphy, and practical applications of geophysical methods. Hua-Wei Zhou, Department Chair of the Department of Earth and Atmospheric Sciences, said about Sheriff: “…a giant figure in the world of exploration geophysics… When I think about Bob, a number of key words pop up in my mind: kindness, honesty, hardworking, seeking perfection, generosity and wisdom.”
Mrinal Kanti Sen, an Indian-American geophysicist is the John A. and Katherine G. Jackson Chair in Applied Seismology at the Jackson School of Geosciences of the University of Texas at Austin. He holds joint appointment with the Institute for Geophysics (UTIG) and the Department of Geological sciences (DGS). Since 2016, he has been serving as the head of the energy research division at UTIG. He has been a pioneer in the field Seismic Wave Propagation and Inverse Theory applied to Geophysical Problems. He has published more than 180 papers, and two books, and supervised over 50 graduate students. As an author, he is widely held in libraries worldwide. He was recognized by the Society of Exploration Geophysicists in 2015 for pioneering development and application of global optimization methods in geophysical inversion.
Jerry M. Harris is an American geophysicist and the Cecil and Ida Green Professor of Geophysics at Stanford University. Harris established the Stanford Wave Physics Lab, which investigate the physics of seismic and electromagnetic waves in complex media. He was co-founder of the Stanford Global Climate and Energy Project and the Center for Computational Earth and Environmental Science.
Frank Rieber was a pioneering geophysicist, entrepreneur, inventor, and innovator, and made advances in a variety of fields. He is particularly remembered for his groundbreaking research in automated seismic data processing, decades before the industry performed similar research. His patents related to reproduceable seismograms would lead to the ability to better locate petroleum, and gain widespread use and recognition by improving the fidelity of seismographs in accurately depicting underground rock strata and oil structures, particularly in areas with complex geological formations.
References
- 1 2 "156990 Claerbout (2003 KX18)". Minor Planet Center. Retrieved 17 August 2019.
- ↑ Jon Claerbout's web page
- ↑ Stanford University directory – Jon F. Claerbout
- ↑ Claerbout, Jon F.; Karrenbach, Martin (1992). "Electronic documents give reproducible research a new meaning". SEG Technical Program Expanded Abstracts 1992. pp. 601–604. doi:10.1190/1.1822162.
- ↑ Society of Exploration Geophysicists Archived 2007-12-17 at the Wayback Machine
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 17 August 2019.
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