R.E. Sheriff’s scientific contributions

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Publications (14)


Problems in Exploration Seismology and their Solutions
  • Article

January 2004

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1,014 Reads

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25 Citations

Lloyd P Geldart

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Robert E Sheriff

I have had the opportunity to use this book for many months now and am finally prepared to submit this review. I have referred to it many times and have been both pleased and disappointed. Thrilled because it concisely addressed the topic I was researching with a question that was followed by a brief theoretical analysis and numerical example. Disappointed because the figures are black and white, and the symbols used for parameters are different from what I would like to see. (Get a life!!!) This relatively new book P ro b l e m s has a unique niche between S h e r i ff's classic Encyclopedic Dictionary of Applied Geophysics and Sheriff and Geldart's timeless text Exploration Seismology. The authors' initial objective for Problems was to "furnish solu-tions for the problems in the first edition of E x p l o r a t i o n S e i s m o l o g y ", but the project grew to "provide a stand-alone volume … which can be used with whatever textbooks pro f e s-sors and students are using". To me, it is much more than that; it is a stand-alone re f e rence book as well. As an educator and researcher, I have continuously referred to the Dictionary and to Exploration Seismology to clarify my understanding of a given topic or to search for an alternate explanation. The expression "another arrow in the quiver" would be trite to describe Problems as it is a valuable refer-ence book that I am now continually marking and using. The description, explanation, and solution of the topic are about a page in length and it is now the book I grab after the "Dictionary". Most of the topics I am searching for are there, and if I am not careful, I become distracted by the descrip-tions of other topics on the neighbouring pages.



Exploration Seismology

January 1996

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116 Reads

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1,302 Citations

This is the completely updated revision of the highly regarded book Exploration Seismology. Available now in one volume, this textbook provides a complete and systematic discussion of exploration seismology. The first part of the book looks at the history of exploration seismology and the theory - developed from the first principles of physics. All aspects of seismic acquisition are then described. The second part of the book goes on to discuss data-processing and interpretation. Applications of seismic exploration to groundwater, environmental and reservoir geophysics are also included. The book is designed to give a comprehensive up-to-date picture of the applications of seismology. Exploration Seismology's comprehensiveness makes it suitable as a text for undergraduate courses for geologists, geophysicists and engineers, as well as a guide and reference work for practising professionals.


Exploration Seismology

August 1995

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364 Reads

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880 Citations

Sumario: Theory of seismic waves -- Partitioning at an interface -- Geometry of seismic waves -- Seismic velocity -- Characteristics of seismic events -- Reflection field methods -- Data processing -- Geologic interpretation of reflection data -- Refraction methods -- 3-D methods -- Specialized techniques -- Specialized applications -- Background mathematics -- Appendices: List of abreviations used. Trademarks and proper names used. Random numbers. Units. Decibel conversion. Typical instrument specifications and conventions. A seismic report. Symbols used in mapping





Applied Geophysics

October 1990

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353 Reads

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391 Citations

Completely revised and updated, this new edition of the popular and highly regarded textbook, Applied Geophysics, describes the physical methods involve din exploration for hydrocarbons and minerals. These tools include gravity, magnetic, seismic, electrical, electromagnetic, and radioactivity studies. All aspects of these methods are described, including theoretical considerations,data acquisition, and data processing and interpretation, with the objective of locating concentrations of natural resources and defining their extent. In the past fourteen years or so since the writing of Applied Geophysics, there have been many changes in the field of exploration geophysics. The authors give full treatment to changes in this field, which include improved techniques for calculating gravity fields, the use of proton-precession and optically-pumped magnetometers, improved quality of seismic data,magnetotelluric as a practical exploration method, new electromagnetic exploration methods, the use of gamma-ray sp


Exploration seismology. Volume 1: History, theory, and data acquisition

January 1983

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46 Reads

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131 Citations

This book is intended both as a text for students in advanced courses and also as a reference book for persons engaged in seismic exploration. The theoretician and student need to appreciate what is practical, and practitioners need to understand theory and the possibilities it may suggest. The authors have tried to strike a balance between theoretical aspects and practical details, that is, to include sufficient theory to enable the reader to follow most of the current literature and enough practical details to make the book of value to the practicing seismologist. This book is structured to be as consistent and systematic as possible. Effort has been made to be consistent with mathematical conventions, definitions and symbols. It has been necessary, however, to use certain symbols for several purposes, mainly to conform to accepted practices. A listing of the mathematical symbols is given immediately following this preface. They give the systematic derivation of relationships from first principles of physics, except for a few cases where the derivations are excessively lengthy or involve higher mathematics.


EXPLORATION SEISMOLOGY, VOLUME 1: HISTORY, THEORY, AND DATA ACQUISITION; VOLUME 2: DATA-PROCESSING AND INTERPRETATION.

January 1983

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52 Reads

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8 Citations

Vol. 1 deals with history, theory, and data acquisition. After a historical introductory chapter, the theory of seismic waves is presented, the geometry of seismic wave paths is considered and characteristics of seismic events are analyzed. The reflection field methods and equipment as well as refraction methods are described in detail. Vol. 2 deals with data-processing and interpretation in seismic exploration. Individual chapters discuss seismic velocity, data-processing, geologic interpretation of reflection data, and background mathematics. 226 refs.


Citations (12)


... It allows for the precise calculation of the velocity of the second layer and the average velocity of the first layer using intermediate shot points. This method also facilitates the determination of the depth of the fracture boundary directly below each geophone (Geldart & Sheriff, 2004). Delay time is not an observable quantity, but is a function of the depth to a refracting horizon and of the velocities of propagation along the refractor and through the overlying media. ...

Reference:

Geological Insights from Seismic Refraction in the South Thomson Orogen: A Comparative Study of Delay-Time, Plus-Minus, and GRM Methods
Problems in Exploration Seismology and their Solutions
  • Citing Book
  • January 2004

... Magnetometry commonly shows good response to igneous bodies and has been widely used in its mapping, particularly in the prospection of primary source diamonds (kimberlitic and lamproitic bodies), especially in airborne surveys for its low cost and high sensitivity (e.g., Macnae 1995, Kono 2007. Igneous rocks, in particular, basic igneous rocks, have the highest magnetic susceptibilities due to their relatively high magnetite content and can generate significative magnetic anomalies (e.g., Geldart et al. 1990, Lino et al. 2018. Gravimetry has been used in the search and characterization of any targets that have significant density contrasts (Nabighian et al. 2005), which frequently is the case in igneous bodies. ...

Magnetic Methods
  • Citing Article
  • October 1990

Applied Geophysics

... It was as early as 1970"s when Walton [3] presented the concept of 3D seismic surveys and French [4] demonstrated clearly the value of 3D seismic over 2D seismic. Sheriff and Geldart [5] claim that the principle advantage of 3D over 2D is that 3D surveys result in clearer and more accurate pictures of geological detail and their costs are more than repaid by elimination of unnecessary development holes and by the increase in recoverable reserves through the discovery of isolated reservoir pools which otherwise might be missed. West [6] research study concurs with Sheriff and Geldart [5] research finding. ...

EXPLORATION SEISMOLOGY, VOLUME 1: HISTORY, THEORY, AND DATA ACQUISITION; VOLUME 2: DATA-PROCESSING AND INTERPRETATION.
  • Citing Article
  • January 1983

... Rock's electrical properties in low frequencies have been investigated since the early 40s. Igneous rocks and deep sedimentary formations, which comprise the main content of Earth's crust at several kilometers and deeper [20,21], are mostly dielectric materials with relatively high resistivity. Their absorption characteristics depend on several internal physical properties such as ferromagnetic and water content and external conditions such as rock skin temperature and radiated frequency. ...

Electrical Properties of Rocks and Minerals
  • Citing Article
  • October 1990

Applied Geophysics

... The Anambra Basin and the adjoining southern Bida Basin are located along the Pan-African Mobile Belt, between the prehistoric platforms of West Africa and the Congo (Fig. 1a). The location and trend of the Anambra Basin inherited the pre-existing shear zones related to the Pan-African orogeny (Telford et al., 1990) (Fig. 1b). The area under study falls within two interesting geologic units, namely the banded iron formation of Nigeria. ...

Applied Geophysics
  • Citing Book
  • January 1976

... Using the range of the velocities cited in Geldart and Sheriff (2004) for average sedimentary sequences (sandstones) encasing salt structures, with φ = 20-30% and the starting velocities V0 for Lower Triassic sediments in the Southern Permian Basin (3,590 m/s) (Schnabel et al., 2021) (Schnabel et al., 2021), the height's mean of all salt diapirs identified in the study area is 2,772 m ( Figure 9b). The maximum height of the tallest salt diapirs is approximately 4,128 m and the smallest is 1,130 m. ...

Problems in Exploration Seismology and their Solutions
  • Citing Article
  • January 2004

... The inversion method considers the geological parameters of the field conditions through regional geological data. These (Gercek, 2007) (Table 3), density (Telford et al., 1990) ( Amalina et al. (2022) show that the research area consists of four lithological layers: sand, coarse sand-gravel, siltclay, and breccia. This study compares the inversion model results based on the number of layers from the N-SPT drill test with the inversion model results based on the number of lithologies only. ...

Applied Geophysics, 2 nd Edition
  • Citing Article
Tom Butler-Bowdon

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W. M. Telford

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L. P. Geldart

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[...]

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Paul O. Zelinsky

... S-wave velocity is one of the constants closely related to Young's modulus because the most comprehensive and accurate definition of stiffness includes Young's modulus and shear modulus [22]. These two moduli can be defined as the density of the material and the two seismic velocities (Poisson ratio), Vp and Vs [23]. Therefore, the Vs information from the subsurface is directly related to the stiffness property of the material. ...

Exploration seismology. Volume 1: History, theory, and data acquisition
  • Citing Book
  • January 1983

... Maximum horizontal gradients from gravity or magnetic data (e.g., Blakely 1996) can help to interpret fault structure, most notably faults with greater than hundreds of meters of offset (e.g., Blakely and Connard 1989), or where faulting juxtaposes stratigraphy with significant density or magnetic contrasts. 2D forward modeling of gravity and magnetic data, with well-constrained magnetic and density properties of the lithologic units, can also help to constrain structure, stratigraphy, and aid in cross-section construction (e.g., Talwani 1959;Geldart et al. 1966;Telford et al. 1990). Once a 3D geologic model is constructed, 2D or 3D inversion of potential field data (e.g., Witter et al. 2016) can be used to evaluate the misfit of the 3D geologic map relative to the potential field data. ...

Applied Geophysics
  • Citing Chapter
  • October 1990

... shearing) (C. Park et al., 2018). In line with the theory of elasticity (Sheriff & Geldart, 1995), these two moduli can be expressed in terms of a material's density (ρ) and both seismic velocities (Vp and Vs) or through Poisson's ratio (ν), as indicated in Table 1. Consequently, the stiffness of various subsurface layers can be accurately computed by separately estimating these three parameters (ρ, νσ, and Vs). ...

Exploration Seismology
  • Citing Chapter
  • January 1996