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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.

590 Results for the subject "Geophysics":

Geophysics policy: A select, annotated bibliography

AbstractThis bibliography covers material within the broad range of geophysics policy, published between 1 January 1967 and 31 March 1968. ‘Geophysics policy’ has been liberally defined to include items of relevance to geophysics whether or not they are conconcerned with geophysics per se.

P.J. Smith Publication date: 1968/01/01
Chapter 4 - Petroelastic Modeling and Geomechanical Modeling

AbstractSeismic measurements provide much of the giga scale data that can be directly used to characterize a reservoir. Reservoir geophysics is the application of geophysical techniques to the production of subsurface resources during the producing life of a field. The resolution associated with reservoir geophysics tends to be more quantitative than the resolution associated with exploration geophysics. Exploration geophysics is the application of geophysical techniques to the search for commercial resources in the subsurface. By contrast, reservoir geophysics can use data from measurements in wells to calibrate the processing and interpretation of seismic measurements. The importance of reservoir geophysics to the reservoir management function makes it worthwhile to introduce some basic geophysical concepts. We then present two models that quantify the concepts: a petroelastic model and a geomechanical model. Several IFLO applications illustrate geomechanics, compaction, and scheduli Read more...

John R. Fanchi Publication date: 2018/01/01
Chapter 1 - Archaeological Geophysics Biases

AbstractThis chapter describes some of the more glaring biases in contemporary archaeological geophysics (AGP) and AGP publishing. It also addresses the need for hunter-gatherer (h/g) AGP explicitly focused on the research agendas of h/g archaeologists as opposed to focus on large sites and materials.

Jason Thompson Publication date: 2016/01/01
Mapping and discriminating the Pan-African granitoids in the Hoggar (southern Algeria) using Landsat 7 ETM+ data and airborne geophysics

Highlights•Integrated geological interpretation using Landsat7 ETM + images and airborne geophysics.•Mapping and Discrimination of different Pan-African granitoid types.•Characterization of geochemical affinities of granitoids in unstudied areas.

Siham Zerrouk Publication date: 2017/03/01
Chaos theory in geophysics: past, present and future

AbstractThe past two decades of research on chaos theory in geophysics has brought about a significant shift in the way we view geophysical phenomena. Research on chaos theory in geophysics continues to grow at a much faster pace, with applications to a wide variety of geophysical phenomena and geophysical problems. In spite of our success in understanding geophysical phenomena also from a different (i.e. chaotic) perspective, there still seems to be lingering suspicions on the scope of chaos theory in geophysics. The goal of this paper is to present a comprehensive account of the achievements and status of chaos theory in geophysics, and to disseminate the hope and scope for the future. A systematic review of chaos theory in geophysics, covering a wide spectrum of geophysical phenomena studied (e.g. rainfall, river flow, sediment transport, temperature, pressure, tree ring series, etc.), is presented to narrate our past achievements not only in understanding and predicting geophysical Read more...

B Sivakumar Publication date: 2004/01/01
The relationship of fractals in geophysics to “the new science”

AbstractMany phenomena in geophysics satisfy fractal statistics, examples range from the frequency–area statistics of earthquakes to the time series of the earth’s magnetic field. Solutions to classical differential equations cannot give this type of behavior. Several “cellular automata” models have successfully reproduced the observed statistics. For example, the slider-block model for earthquakes. Stephen Wolfram’s recent book A New Kind of Science sets forth a “new science” based on cellular automata. This paper discusses the role of cellular automata in geophysics.

Donald L. Turcotte Publication date: 2004/01/01
Application of geophysical methods in a dam project: Life cycle perspective and Taiwan experience

Highlights•Various new applications of engineering geophysics on dams in Taiwan are introduced from a life cycle perspective.•The needs of dam engineering are emphasized and how to adapt appropriate geophysical methods accordingly are demonstrated.•More quantitative engineering interpretation and process monitoring are proposed at various stages of dam engineering.•Extending the application of geophysics from planning phase to construction phase and sustainable management, are discussed.

Chun-Hun Lin Publication date: 2018/11/01
Lévy models and scale invariance properties applied to Geophysics

AbstractIn this work we study scale invariant functions and stochastic Lévy models and we apply them to geophysical data. We show that a pattern arises from the scale invariance property and Lévy flight models that may be used to estimate parameters related to some major event–major earthquakes.

M.C. Mariani Publication date: 2013/02/15
Machine Learning Algorithms for Stratigraphy Classification on Uranium Deposits

AbstractMachine learning today becomes more and more effective instrument to solve many particular problems, where there are difficulties to apply well known and described math model. In other words - it is a great tool to describe non-linear phenomena. We tried to use this technique to improve existing process of stratigraphy, and reduce costs on site by applying computer leaded predictions on the basis of existing on-field collected data. Article describes usage of machine learning algorithms for stratigraphy boundaries classification based on geophysics logging data for uranium deposit in Kazakhstan. Correct marking of stratigraphy from geophysics logging data is complex non-linear task. To solve this task we applied several algorithms of machine learning: random forest, logistic regression, gradient boosting, k nearest neighbour and XGBoost.

Timur Merembayev Publication date: 2019/01/01
Analysis of stochastic numerical schemes for the evolution equations of geophysics☆

AbstractWe present and study the stability and convergence, and order of convergence of a numerical scheme used in geophysics, namely, the stochastic version of a deterministic “implicit leapfrog” scheme which has been developed for the approximation of the so-called barotropic vorticity model. Two other schemes which might be useful in the context of geophysical applications are also introduced and discussed.

B.D. Ewald Publication date: 2003/11/01
Diagnostics of the shape and orientation of a rock failure zone based on electrical measurements as an inverse problem of geophysics

AbstractExploration geophysics is concerned with the development of methods and techniques for remote search for mineral deposits, solution of various engineering and geological problems, mining monitoring, and diagnostics of zones of rock bursts and natural and technogenic tectonic earthquakes. In this paper, we consider the diagnostic problem of exploration geophysics related to the determination of the shape and inclination angle of a plane source of natural geoelectric field, which, under certain conditions, simulates a rock failure zone, e.g., during the preparation of rock bursts at the sites of developed mineral deposits. This approach may also be useful in determining the shape and size of ore shoots by electrical measurements on the ground surface. Evaluation of the parameters of a rock failure zone is required in the case of accumulation of multiple fractures having charges of the same sign before a catastrophic failure. This problem is formulated as a Fredholm-Urysohn integr Read more...

D.Yu. Sirota Publication date: 2018/01/01
ArticleSolar radiation data for indonesia

AbstractThe solar radiation climate of Indonesia was surveyed from 1969 to 1976 as part of a project of the Meteorological and Geophysics Centre, Jakarta. Summaries of this survey have been presented in reports of the Centre for Meteorological and Geophysics primarily from the point of view of climatic studies. The study reported in the present paper has processed this data into computer compatible form and generated representative data years for use in the analysis of the performance of solar energy collecting systems. Comparison of irradiation conditions in Indonesia and neighbouring countries is also presented.

G.L. Morrison Publication date: 1992/07/01
CHAPTER 9 - Geophysics As They Saw It

No abstract

CHARLES C. BATES Publication date: 1982/01/01
Integrated simulation of vertical fracture propagation induced by water injection and its borehole electromagnetic responses in shale gas systems

Highlights•Integrated simulation of flow, geomechanics, and electromagnetic (EM) geophysics.•Detection of the upward hydraulic fracture propagation.•Prevention of ground water contamination in shale gas development.•Application of physically realistic hydraulic fractures to the EM simulation.

Jihoon Kim Publication date: 2018/06/01
Review articlePotential-field data in integrated frontier basin geophysics: Successes and challenges on Australia's continental margin

Highlights•Frontier sedimentary basins lack seismic reflection and well data.•Gravity and magnetic data have an important role in underexplored frontier basins.•Australian margin lacks seismic refraction data for basement and crustal structure.•Potential for more forward/inverse gravity/magnetic modelling incorporating process.

R. Hackney Publication date: 2015/01/01
Chapter 5 - Exploration Geophysics

No abstract

S.K. Haldar Publication date: 2013/01/01
International Geophysics Series

No abstract

Renata Dmowska Publication date: 1992/01/01
5 - Geophysics and environmental studies

No abstract

Pillarisetty Venkataramana Publication date: 2007/01/01
Nuclear geophysics in prospecting, exploration and development of oil and gas fields

AbstractNuclear-geophysics investigations are widely and successfully used in prospecting, exploration and development of oil and gas fields. These methods are most efficient in the further exploration of producing oil fields, the control of oil-and-gas field development and in the calculation of reserves of large oil and gas fields. Specific nuclear-geophysical methods (conventional and spectrometric γ-logging, γ−γ logging, neutron logging, pulsed neutron logging and its modifications, nuclear magnetic resonance logging), techniques of application, examples of resolved problems and the specification for down-hole equipment are discussed in this review.

E.V. Karus Publication date: 1983/01/01
Geophysics of Locating Karst and Caves

No abstract

Barbara Anne am Ende Publication date: 2012/01/01
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