ALBERT

Description / Table of Contents: PREFACE Seismic imaging is the process through which seismograms recorded on the Earth's surface are mapped into representations of its interior properties. Imaging methods are nowadays applied to a broad range of seismic observations: from nearsurface environmental studies, to oil and gas exploration, even to long-period earthquake seismology. The characteristic length scales of the features imaged by these techniques range over many orders of magnitude. Yet there is a common body of physical theory and mathematical techniques which underlies all these methods. The focus of this book is the imaging of reflection seismic data from controlled sources. At the frequencies typical of such experiments, the Earth is, to a first approximation, a vertically stratified medium. These stratifications have resulted from the slow, constant deposition of sediments, sands, ash, and so on. Due to compaction, erosion, change of sea level, and many other factors, the geologic, and hence elastic, character of these layers varies with depth and age. One has only to look at an exposed sedimentary cross section to be impressed by the fact that these changes can occur over such short distances that the properties themselves are effectively discontinuous relative to the seismic wavelength. These layers can vary in thickness from less than a meter to many hundreds of meters. As a result, when the Earth's surface is excited with some source of seismic energy and the response recorded on seismometers, we will see a complicated zoo of elastic wave types: reflections from the discontinuities in material properties, multiple reflections within the layers, guided waves, interface waves which propagate along the boundary between two different layers, surface waves which are exponentially attenuated with depth, waves which are refracted by continuous changes in material properties, and others. The character of these seismic waves allows seismologists to make inferences about the nature of the subsurface geology. Because of tectonic and other dynamic forces at work in the Earth, this first-order view of the subsurface geology as a layer cake must often be modified to take into account bent and fractured strata. Extreme deformations can occur in processes such as mountain building. Under the influence of great heat and stress, some rocks exhibit a taffy-like consistency and can be bent into exotic shapes without breaking, while others become severely fractured. In marine environments, less dense salt can be overlain by more dense sediments; as the salt rises under its own buoyancy, it pushes the overburden out of the way, severely deforming originally flat layers. Further, even on the relatively localized scale of exploration seismology, there may be significant lateral variations in material properties. For example, if we look at the sediments carried downstream by a river, it isclear that lighter particles will be carried further, while bigger ones will be deposited first; flows near the center of the channel will be faster than the flow on the verge. This gives rise to significant variation is the density and porosity of a given sedimentary formation as a function of just how the sediments were deposited. Taking all these effects into account, seismic waves propagating in the Earth will be refracted, reflected and diffracted. In order to be able to image the Earth, to see through the complicated distorting lens that its heterogeneous subsurface presents to us, in other words, to be able to solve the inverse scattering problem, we need to be able to undo all of these wave propagation effects. In a nutshell, that is the goal of imaging: to transform a suite of seismograms recorded at the surface of the Earth into a depth section, i.e., a spatial image of some property of the Earth (usually wave speed or impedance). There are two main types of spatial variations of the Earth's properties. There are the smooth changes (smooth meaning possessing spatial wavelengths which are long compared to seismic wavelengths) associated with processes such as compaction. These gradual variations cause ray paths to be gently turned or refracted. On the other hand, there are the sharp changes (short spatial wavelength), mostly in the vertical direction, which we associate with changes in lithology and, to a lesser extent, fracturing. These short wavelength features give rise to the reflections and diffractions we see on seismic sections. If the Earth were only smoothly varying, with no discontinuities, then we would not see any events at all in exploration seismology because the distances between the sources and receivers are not often large enough for rays to turn upward and be recorded. This means that to first order, reflection seismology is sensitive primarily to the short spatial wavelength features in the velocity model. We usually assume that we know the smoothly varying part of the velocity model (somehow) and use an imaging algorithm to find the discontinuities. The earliest forms of imaging involved moving, literally migrating, events around seismic time sections by manual or mechanical means. Later, these manual migration methods were replaced by computer-oriented methods which took into account, to varying degrees, the physics of wave propagation and scattering. It is now apparent that all accurate imaging methods can be viewed essentially as linearized inversions of the wave equation, whether in terms of Fourier integral operators or direct gradient-based optimization of a waveform misfit function. The implicit caveat hanging on the word "essentially" in the last sentence is this: people in the exploration community who practice migration are usually not able to obtain or preserve the true amplitudes of the data. As a result, attempts to interpret subtle changes in reflector strength, as opposed to reflector position, usually run afoul of one or more approximations made in the sequence of processing steps that makes up a migration (trace equalization, gaining, deconvolution, etc.) On the other hand, if we had true amplitude data, that is, if the samples recorded on the seismogram really were proportional to the velocity of the piece of Earth to which the geophone were attached, then we could make quantitative statements about how spatial variations in reflector strength are related to changes in geological properties. The distinction here is the distinction between imaging reflectors, on the one hand, and doing a true inverse problem for the subsurface properties on the other. Until quite recently the exploration community was exclusively concerned with the former, and today the word "migration" almost always refers to the imaging problem. The more sophisticated view of imaging as an inverse problem is gradually making its way into the production software of oil and gas exploration companies, since careful treatment of amplitudes is often crucial in making decisions on subtle lithologic plays (amplitude versus offset or AVO) and in resolving the chaotic wave propagation effects of complex structures. When studying migration methods, the student is faced with a bewildering assortment of algorithms, based upon diverse physical approximations. What sort of velocity model can be used: constant wave speed v? v(x), v(x, z), v(x, y, z)? Gentle dips? Steep dips? Shall we attempt to use turning or refracted rays? Take into account mode converted arrivals? 2D (two dimensions)? 3D? Prestack? Poststack? If poststack, how does one effect one-way wave propagation, given that stacking attenuates multiple reflections? What domain shall we use? Time-space? Time-wave number? Frequency-space? Frequency-wave number? Do we want to image the entire dataset or just some part of it? Are we just trying to refine a crude velocity model or are we attempting to resolve an important feature with high resolution? It is possible to imagine imaging algorithms that would work under the most demanding of these assumptions, but they would be highly inefficient when one of the simpler physical models pertains. And since all of these situations arise at one time or another, it is necessary to look at a variety of migration algorithms in daily use. Given the hundreds of papers that have been published in the past 15 years, to do a reasonably comprehensive job of presenting all the different imaging algorithms would require a book many times the length of this one. This was not my goal in any case. I have tried to emphasize the fundamental physical and mathematical ideas of imaging rather than the details of particular applications. I hope that rather than appearing as a disparate bag of tricks, seismic imaging will be seen as a coherent body of knowledge, much as optics is...

Description / Table of Contents: DEKORP, the German continental reflection seismic program, was the major focus of deep seismic research in Germany in the 1980s and 1990s. The seismic sections provided fundamental new insight into deep geological structure of the European continent and the dynamics of continental formation. They formed the basis for worldwide comparative studies of orogenic structure. The complicated signature of the reflections from the deep crust indicated that new processing and interpretation techniques must be considered to better image the crystalline crust. Results of these efforts, including pre-stack migration, 3-D imaging, shear waves and seismic anisotropy, are presented in this special volume. In part, the articles open the perspective to new and future research. In part, they document research activity triggered by technical and interpretational questions raised by DEKORP field work and profiling results. Many of the presented methods can find immediate application in industrial seismic prospecting.

Description / Table of Contents: Variations in seismic Q are sensitive to a much greater extent than are seismic velocity variations on factors such as temperature, fluid content, and the movement of solid state defects in the earth. For that reason an understanding of Q and its variation with position in the earth and with time should provide information in earth's tectonic evolution, as well as on aspects of its internal structure. Progress in understanding Q has suffered from difficulty in obtaining reliable amplitude data at global and temporary stations. Moreover, laboratory determinations of Q, until recently, were most often made at frequencies much higher than those measured by seismologists for waves propagating through the earth. Recent advances in seismic station distribution and quality, as well as in methodology at both high and low fequencies, have greatly improved the quality of observational data available to seismologists from global stations. Concurrent advances have been made in measuring Q using laboratory samples at frequencies that pertain to the earth and in theoretical understanding of seismic wave attenuation. Papers of this volume present new information on Q in the earth from several perspectives: methodology, results from global and regional observations of both body and surface waves, laboratory measurements, and theoretical understanding. The editors believe that we have reached a new threshold in Q studies and that advances in data quality and methodology will spur increased interest in this difficult, but interesting field.

Description / Table of Contents: This volume contains twenty-five research papers on seismicity patterns, their interpretation and their possible relevance to learning how to predict earthquakes. The interpretation of seismicity patterns has become somewhat controversial. Some researchers present case histories suggesting that earthquakes may be predicted by increased seismic moment release or seismic quiescence and, in general, by understanding the processes of self-organized criticality. Others deny these hypotheses. Although the problem of recognizing foreshocks in real time remains unsolved, new properties of microearthquakes as a function of time are coming to light. Computer modeling of seismicity also is advancing in sophistication and relevance. Surprisingly, b-values seem to hold substantial information about varying local conditions of earthquake generation.

Description / Table of Contents: Earthquakes in shallow subduction zones account for the greatest part of seismic energy release in the Earth and often cause significant damage; in some cases they are accompanied by devastating tsunamis. Understanding the physics of seismogenic and tsunamigenic processes in such zones continues to be a challenging focus of ongoing research. The seismologic and geodetic work reported in this volume highlights the recent advances made toward quantifying and understandig the role of shallow plate coupling in the earthquake generation process. The relation between regional seismotectonics, features in the downgoing plate, and the slip distribution in earthquakes are examined for recent and great historical events. In addition to papers reporting new results, review articles on tsunami and tsunamigenic earthquakes and depth dependent plate interface properties are presented. These observational results, along with complementary laboratory and theoretical studies, can assist in assessing the seismic potential of a given region.

Description / Table of Contents: John F. Aitken and John A. Howell: High resolution sequence stratigraphy: innovations, applications and future prospects / Geological Society, London, Special Publications, 104:1-9, doi:10.1144/GSL.SP.1996.104.01.01 --- S. F. Mitchell, C. R. C. Paul, and A. S. Gale: Carbon isotopes and sequence stratigraphy / Geological Society, London, Special Publications, 104:11-24, doi:10.1144/GSL.SP.1996.104.01.02 --- S. J. Davies and T. Elliott: Spectral gamma ray characterization of high resolution sequence stratigraphy: examples from Upper Carboniferous fluvio-deltaic systems, County Clare, Ireland / Geological Society, London, Special Publications, 104:25-35, doi:10.1144/GSL.SP.1996.104.01.03 --- David G. Quirk: ‘Base profile’: a unifying concept in alluvial sequence stratigraphy / Geological Society, London, Special Publications, 104:37-49, doi:10.1144/GSL.SP.1996.104.01.04 --- Ian D. Bryant: The application of physical measurements to constrain reservoir-scale sequence stratigraphic models / Geological Society, London, Special Publications, 104:51-63, doi:10.1144/GSL.SP.1996.104.01.05 --- John M. Armentrout: High resolution sequence biostratigraphy: examples from the Gulf of Mexico Plio-Pleistocene / Geological Society, London, Special Publications, 104:65-86, doi:10.1144/GSL.SP.1996.104.01.06 --- David C. Jennette and Cheyenne O. Riley: Influence of relative sea-level on facies and reservoir geometry of the Middle Jurassic lower Brent Group, UK North Viking Graben / Geological Society, London, Special Publications, 104:87-113, doi:10.1144/GSL.SP.1996.104.01.07 --- F. L. Wehr and L. D. Brasher: Impact of sequence-based correlation style on reservoir model behaviour, lower Brent Group, North Cormorant Field, UK North Sea / Geological Society, London, Special Publications, 104:115-128, doi:10.1144/GSL.SP.1996.104.01.08 --- John A. Howell and Stephen S. Flint: A model for high resolution sequence stratigraphy within extensional basins / Geological Society, London, Special Publications, 104:129-137, doi:10.1144/GSL.SP.1996.104.01.09 --- T. McKie and I. R. Garden: Hierarchical stratigraphic cycles in the non-marine Clair Group (Devonian) UKCS / Geological Society, London, Special Publications, 104:139-157, doi:10.1144/GSL.SP.1996.104.01.10 --- A. Guy Plint: Marine and nonmarine systems tracts in fourth-order sequences in the Early-Middle Cenomanian, Dunvegan Alloformation, northeastern British Columbia, Canada / Geological Society, London, Special Publications, 104:159-191, doi:10.1144/GSL.SP.1996.104.01.11 --- John F. Aitken and Stephen S. Flint: Variable expressions of interfluvial sequence boundaries in the Breathitt Group (Pennsylvanian), eastern Kentucky, USA / Geological Society, London, Special Publications, 104:193-206, doi:10.1144/GSL.SP.1996.104.01.12 --- Ciaran J. O’Byrne and Stephen Flint: Interfluve sequence boundaries in the Grassy Member, Book Cliffs, Utah: criteria for recognition and implications for subsurface correlation / Geological Society, London, Special Publications, 104:207-220, doi:10.1144/GSL.SP.1996.104.01.13 --- Gary J. Hampson, Trevor Elliott, and Stephen S. Flint: Critical application of high resolution sequence stratigraphic concepts to the Rough Rock Group (Upper Carboniferous) of northern England / Geological Society, London, Special Publications, 104:221-246, doi:10.1144/GSL.SP.1996.104.01.14 --- David Uličný and Lenka Špičáková: Response to high frequency sea-level change in a fluvial to estuarine succession: Cenomanian palaeovalley fill, Bohemian Cretaceous Basin / Geological Society, London, Special Publications, 104:247-268, doi:10.1144/GSL.SP.1996.104.01.15 --- David Owen: Interbasinal correlation of the Cenomanian Stage; testing the lateral continuity of sequence boundaries / Geological Society, London, Special Publications, 104:269-293, doi:10.1144/GSL.SP.1996.104.01.16 --- Bruce W. Fouke, Arnout-Jan W. Everts, Erik W. Zwart, Wolfgang Schlager, P. C. Smalley, and Helmut Weissert: Subaerial exposure unconformities on the Vercors carbonate platform (SE France) and their sequence stratigraphic significance / Geological Society, London, Special Publications, 104:295-319, doi:10.1144/GSL.SP.1996.104.01.17 --- Dave Hunt, Tim Allsop, and Richard E. Swarbrick: Compaction as a primary control on the architecture and development of depositional sequences: conceptual framework, applications and implications / Geological Society, London, Special Publications, 104:321-345, doi:10.1144/GSL.SP.1996.104.01.18 --- Lars Stemmerik: High frequency sequence stratigraphy of a siliciclastic influenced carbonate platform, lower Moscovian, Amdrup Land, North Greenland / Geological Society, London, Special Publications, 104:347-365, doi:10.1144/GSL.SP.1996.104.01.19

Description / Table of Contents: A. Morris and D. H. Tarling: Palaeomagnetism and tectonics of the Mediterranean region: an introduction / Geological Society, London, Special Publications, 105:1-18, doi:10.1144/GSL.SP.1996.105.01.01 --- Western Mediterranean --- A. Kirker and E. McClelland: Application of net tectonic rotations and inclination analysis to a high-resolution palaeomagnetic study in the Betic Cordillera / Geological Society, London, Special Publications, 105:19-32, doi:10.1144/GSL.SP.1996.105.01.02 --- J. J. Villalaín, M. L. Osete, R. Vegas, V. García-Dueñas, and F. Heller: The Neogene remagnetization in the western Betics: a brief comment on the reliability of palaeomagnetic directions / Geological Society, London, Special Publications, 105:33-41, doi:10.1144/GSL.SP.1996.105.01.03 --- H. Feinberg, O. Saddiqi, and A. Michard: New constraints on the bending of the Gibraltar Arc from palaeomagnetism of the Ronda peridotites (Betic Cordilleras, Spain) / Geological Society, London, Special Publications, 105:43-52, doi:10.1144/GSL.SP.1996.105.01.04 --- D. Khattach, D. Najid, N. Hamoumi, and D. H. Tarling: Palaeomagnetic studies in Morocco: tectonic implications for the Meseta and Anti-Atlas since the Permian / Geological Society, London, Special Publications, 105:53-57, doi:10.1144/GSL.SP.1996.105.01.05 --- D. Rey, P. Turner, and A. Ramos: Palaeomagnetism and magnetostratigraphy of the Middle Triassic in the Iberian Ranges (Central Spain) / Geological Society, London, Special Publications, 105:59-82, doi:10.1144/GSL.SP.1996.105.01.06 --- M. T. Juárez, M. L. Osete, R. Vegas, C. G. Langereis, and G. Meléndez: Palaeomagnetic study of Jurassic limestones from the Iberian Range (Spain): tectonic implications / Geological Society, London, Special Publications, 105:83-90, doi:10.1144/GSL.SP.1996.105.01.07 --- M. Garcés, J. M. Parés, and L. Cabrera: Inclination error linked to sedimentary facies in Miocene detrital sequences from the Vallès-Penedès Basin (NE Spain) / Geological Society, London, Special Publications, 105:91-99, doi:10.1144/GSL.SP.1996.105.01.08 --- P. Keller and U. Gehring: Consequences of post-collisional deformation on the reconstruction of the East Pyrenees / Geological Society, London, Special Publications, 105:101-109, doi:10.1144/GSL.SP.1996.105.01.09 --- J. L. Pereira, A. Rapalini, D. H. Tarling, and J. Fonseca: Palaeomagnetic dating and determination of tectonic tilting: a study of Mesozoic-Cenozoic igneous rocks in central West Portugal / Geological Society, London, Special Publications, 105:111-117, doi:10.1144/GSL.SP.1996.105.01.10 --- Central Mediterranean and Carpathians --- J. E. T. Channell: Palaeomagnetism and palaeogeography of Adria / Geological Society, London, Special Publications, 105:119-132, doi:10.1144/GSL.SP.1996.105.01.11 --- M. Iorio, G. Nardi, D. Pierattini, and D. H. Tarling: Palaeomagnetic evidence of block rotations in the Matese Mountains, Southern Apennines, Italy / Geological Society, London, Special Publications, 105:133-139, doi:10.1144/GSL.SP.1996.105.01.12 --- M. Mattei, C. Kissel, L. Sagnotti, R. Funiciello, and C. Faccenna: Lack of Late Miocene to Present rotation in the Northern Tyrrhenian margin (Italy): a constraint on geodynamic evolution / Geological Society, London, Special Publications, 105:141-146, doi:10.1144/GSL.SP.1996.105.01.13 --- M. Fedi, G. Florio, and A. Rapolla: The pattern of crustal block rotations in the Italian region deduced from aeromagnetic anomalies / Geological Society, London, Special Publications, 105:147-152, doi:10.1144/GSL.SP.1996.105.01.14 --- Emő Márton and Péter Márton: Large scale rotations in North Hungary during the Neogene as indicated by palaeomagnetic data / Geological Society, London, Special Publications, 105:153-173, doi:10.1144/GSL.SP.1996.105.01.15 --- Miroslav Krs, Marta Krsová, and Petr Pruner: Palaeomagnetism and palaeogeography of the Western Carpathians from the Permian to the Neogene / Geological Society, London, Special Publications, 105:175-184, doi:10.1144/GSL.SP.1996.105.01.16 --- Václav Houša, Miroslav Krs, Marta Krsová, and Petr Pruner: Magnetostratigraphy of Jurassic-Cretaceous limestones in the Western Carpathians / Geological Society, London, Special Publications, 105:185-194, doi:10.1144/GSL.SP.1996.105.01.17 --- M. Iorio, D. H. Tarling, B. D’argenio, and G. Nardi: Ultra-fine magnetostratigraphy of Cretaceous shallow water carbonates, Monte Raggeto, southern Italy / Geological Society, London, Special Publications, 105:195-203, doi:10.1144/GSL.SP.1996.105.01.18 --- E. McClelland, B. Finegan, and R. W. H. Butler: A magnetostratigraphic study of the onset of the Mediterranean Messinian salility crisis; Caltanissetta Basin, Sicily / Geological Society, London, Special Publications, 105:205-217, doi:10.1144/GSL.SP.1996.105.01.19 --- F. Florindo and L. Sagnotti: Revised magnetostratigraphy and rock magnetism of Pliocene sediments from Valle Ricca (Rome, Italy) / Geological Society, London, Special Publications, 105:219-223, doi:10.1144/GSL.SP.1996.105.01.20 --- Giancarlo Scalera, Paolo Favali, and Fabio Florindo: Palaeomagnetic database: the effect of quality filtering for geodynamic studies / Geological Society, London, Special Publications, 105:225-237, doi:10.1144/GSL.SP.1996.105.01.21 --- Eastern Mediterranean --- A. H. F. Robertson, J. E. Dixon, S. Brown, A. Collins, A. Morris, E. Pickett, I. Sharp, and T. Ustaömer: Alternative tectonic models for the Late Palaeozoic-Early Tertiary development of Tethys in the Eastern Mediterranean region / Geological Society, London, Special Publications, 105:239-263, doi:10.1144/GSL.SP.1996.105.01.22 --- H. J. Mauritsch, R. Scholger, S. L. Bushati, and A. Xhomo: Palaeomagnetic investigations in Northern Albania and their significance for the geodynamic evolution of the Adriatic-Aegean realm / Geological Society, London, Special Publications, 105:265-275, doi:10.1144/GSL.SP.1996.105.01.23 --- D. Kondopoulou, A. Atzemoglou, and S. Pavlides: Palaeomagnetism as a tool for testing geodynamic models in the North Aegean: convergences, controversies and a further hypothesis / Geological Society, London, Special Publications, 105:277-288, doi:10.1144/GSL.SP.1996.105.01.24 --- H. Feinberg, B. Edel, D. Kondopoulou, and A. Michard: Implications of ophiolite palaeomagnetism for the interpretation of the geodynamics of Northern Greece / Geological Society, London, Special Publications, 105:289-298, doi:10.1144/GSL.SP.1996.105.01.25 --- J. D. A. Piper, Joanna M. Moore, O. Tatar, H. Gursoy, and R. G. Park: Palaeomagnetic study of crustal deformation across an intracontinental transform: the North Anatolian Fault Zone in Northern Turkey / Geological Society, London, Special Publications, 105:299-310, doi:10.1144/GSL.SP.1996.105.01.26 --- Antony Morris: A review of palaeomagnetic research in the Troodos ophiolite, Cyprus / Geological Society, London, Special Publications, 105:311-324, doi:10.1144/GSL.SP.1996.105.01.27 --- A. M. Kafafy, D. H. Tarling, M. M. El Gamili, H. H. Hamama, and E. H. Ibrahim: Palaeomagnetism of some Cretaceous Nubian Sandstones, Northern Sinai, Egypt / Geological Society, London, Special Publications, 105:325-332, doi:10.1144/GSL.SP.1996.105.01.28 --- A. L. Abdeldayem and D. H. Tarling: Palaeomagnetism of some Tertiary sedimentary rocks, southwest Sinai, Egypt, in the tectonic framework of the SE Mediterranean / Geological Society, London, Special Publications, 105:333-343, doi:10.1144/GSL.SP.1996.105.01.29 --- Applications in Volcanology --- Leon Bardot, Rick Thomas, and Elizabeth McClelland: Emplacement temperatures of pyroclastic deposits on Santorini deduced from palaeomagnetic measurements: constraints on eruption mechanisms / Geological Society, London, Special Publications, 105:345-357, doi:10.1144/GSL.SP.1996.105.01.30 --- Maurizio De’ Gennaro, Paola R. Gialanella, Alberto Incoronato, Giuseppe Mastrolorenzo, and Debora Naimo: Palaeomagnetic controls on the emplacement of the Neapolitan Yellow Tuff (Campi Flegrei, Southern Italy) / Geological Society, London, Special Publications, 105:359-365, doi:10.1144/GSL.SP.1996.105.01.31 --- Alberto Incoronato: Magnetic stratigraphy procedures in volcanic areas: the experience at Vesuvius / Geological Society, London, Special Publications, 105:367-371, doi:10.1144/GSL.SP.1996.105.01.32 --- Archaeomagnetism --- M. E. Evans: Archaeomagnetic results from the Mediterranean region: an overview / Geological Society, London, Special Publications, 105:373-384, doi:10.1144/GSL.SP.1996.105.01.33 --- P. Márton: Archaeomagnetic directions: the Hungarian calibration curve / Geological Society, London, Special Publications, 105:385-399, doi:10.1144/GSL.SP.1996.105.01.34 --- A. Morris: Glossary of basic palaeomagnetic and rock magnetic terms / Geological Society, London, Special Publications, 105:401-415, doi:10.1144/GSL.SP.1996.105.01.35

Description / Table of Contents: C. F. Mills: Geochemical aspects of the aetiology of trace element related diseases / Geological Society, London, Special Publications, 113:1-5, doi:10.1144/GSL.SP.1996.113.01.01 --- J. A. Plant, J. W. Baldock, and B. Smith: The role of geochemistry in environmental and epidemiological studies in developing countries: a review / Geological Society, London, Special Publications, 113:7-22, doi:10.1144/GSL.SP.1996.113.01.02 --- F. M. Fordyce, D. Masara, and J. D. Appleton: Stream sediment, soil and forage chemistry as indicators of cattle mineral status in northeast Zimbabwe / Geological Society, London, Special Publications, 113:23-37, doi:10.1144/GSL.SP.1996.113.01.03 --- I. O. Jumba, N. F. Suttle, E. A. Hunter, and S. O. Wandiga: Effects of botanical composition, soil origin and composition on mineral concentrations in dry season pastures in western Kenya / Geological Society, London, Special Publications, 113:39-45, doi:10.1144/GSL.SP.1996.113.01.04 --- John Maskall and Iain Thornton: The distribution of trace and major elements in Kenyan soil profiles and implications for wildlife nutrition / Geological Society, London, Special Publications, 113:47-62, doi:10.1144/GSL.SP.1996.113.01.05 --- R. J. Bowell, A. Warren, and I. Redmond: Formation of cave salts and utilization by elephants in the Mount Elgon region, Kenya / Geological Society, London, Special Publications, 113:63-79, doi:10.1144/GSL.SP.1996.113.01.06 --- O. Selinus, A. Frank, and V. Galgan: Biogeochemistry and metal biology / Geological Society, London, Special Publications, 113:81-89, doi:10.1144/GSL.SP.1996.113.01.07 --- W. M. Edmunds and P. L. Smedley: Groundwater geochemistry and health: an overview / Geological Society, London, Special Publications, 113:91-105, doi:10.1144/GSL.SP.1996.113.01.08 --- R. J. Bowell, S. McEldowney, A. Warren, B. Mathew, and M. Bwankuzo: Biogeochemical factors affecting groundwater quality in central Tanzania / Geological Society, London, Special Publications, 113:107-130, doi:10.1144/GSL.SP.1996.113.01.09 --- C. B. Dissanayake: Water quality and dental health in the Dry Zone of Sri Lanka / Geological Society, London, Special Publications, 113:131-140, doi:10.1144/GSL.SP.1996.113.01.10 --- B. Smith, N. Breward, M. B. Crawford, D. Galimaka, S. M. Mushiri, and S. Reeder: The environmental geochemistry of aluminium in tropical terrains and its implications to health / Geological Society, London, Special Publications, 113:141-152, doi:10.1144/GSL.SP.1996.113.01.11 --- Iain Thornton: Sources and pathways of arsenic in the geochemical environment: health implications / Geological Society, London, Special Publications, 113:153-161, doi:10.1144/GSL.SP.1996.113.01.12 --- P. L. Smedley, W. M. Edmunds, and K. B. Pelig-Ba: Mobility of arsenic in groundwater in the Obuasi gold-mining area of Ghana: some implications for human health / Geological Society, London, Special Publications, 113:163-181, doi:10.1144/GSL.SP.1996.113.01.13 --- E. Helios Rybicka: Environmental impact of mining and smelting industries in Poland / Geological Society, London, Special Publications, 113:183-193, doi:10.1144/GSL.SP.1996.113.01.14 --- Keith Nicholson: Lacustrine sediment geochemistry as a tool in retrospective environmental impact assessment of mining and urban development in tropical environments: examples from Papua New Guinea / Geological Society, London, Special Publications, 113:195-199, doi:10.1144/GSL.SP.1996.113.01.15 --- Ron Fuge: Geochemistry of iodine in relation to iodine deficiency diseases / Geological Society, London, Special Publications, 113:201-211, doi:10.1144/GSL.SP.1996.113.01.16 --- C. B. Dissanayake and R. L. R. Chandrajith: Iodine in the environment and endemic goitre in Sri Lanka / Geological Society, London, Special Publications, 113:213-221, doi:10.1144/GSL.SP.1996.113.01.17 --- A. G. Stewart and P. O. D. Pharoah: Clinical and epidemiological correlates of iodine deficiency disorders / Geological Society, London, Special Publications, 113:223-230, doi:10.1144/GSL.SP.1996.113.01.18 --- M. G. Nair, S. M. Maxwell, and B. J. Brabin: The protective role of trace elements in preventing aflatoxin induced damage: a review / Geological Society, London, Special Publications, 113:231-237, doi:10.1144/GSL.SP.1996.113.01.19 --- R. A. Nicholson, P. D. Roberts, and P. J. Baxter: Preliminary studies of acid and gas contamination at Poas volcano, Costa Rica / Geological Society, London, Special Publications, 113:239-244, doi:10.1144/GSL.SP.1996.113.01.20 --- M. A. Oliver: Kriging: a method of estimation for environmental and rare disease data / Geological Society, London, Special Publications, 113:245-254, doi:10.1144/GSL.SP.1996.113.01.21 --- R. Harvey, J. J. Powell, and R. P. H. Thompson: A review of the geochemical factors linked to podoconiosis / Geological Society, London, Special Publications, 113:255-260, doi:10.1144/GSL.SP.1996.113.01.22

Description / Table of Contents: D. B. Snyder, S. B. Lucas, and J. H. McBride: Crustal and mantle reflectors from Palaeoproterozoic orogens and their relation to arc-continent collisions / Geological Society, London, Special Publications, 112:1-23, doi:10.1144/GSL.SP.1996.112.01.01 --- H. R. Rollinson: Tonalite-trondhjemite-granodiorite magmatism and the genesis of Lewisian crust during the Archaean / Geological Society, London, Special Publications, 112:25-42, doi:10.1144/GSL.SP.1996.112.01.02 --- A. Vrevsky, R. Krimsky, and S. Svetov: Rare earth and isotopic (Nd, O) heterogeneity of the Archaean mantle, Baltic Shield / Geological Society, London, Special Publications, 112:43-53, doi:10.1144/GSL.SP.1996.112.01.03 --- E. V. Bibikova, T. Skiöld, and S. V. Bogdanova: Age and geodynamic aspects of the oldest rocks in the Precambrian Belomorian Belt of the Baltic (Fennoscandian) Shield / Geological Society, London, Special Publications, 112:55-67, doi:10.1144/GSL.SP.1996.112.01.04 --- S. V. Bogdanova: High-grade metamorphism of 2.45–2.4 Ga age in mafic intrusions of the Belomorian Belt in the northeastern Baltic Shield / Geological Society, London, Special Publications, 112:69-90, doi:10.1144/GSL.SP.1996.112.01.05 --- Martin J. Van Kranendonk and Richard J. Wardle: Burwell domain of the Palaeoproterozoic Torngat Orogen, northeastern Canada: tilted cross-section of a magmatic are caught between a rock and a hard place / Geological Society, London, Special Publications, 112:91-115, doi:10.1144/GSL.SP.1996.112.01.06 --- Toby Rivers, Flemming Mengel, David J. Scott, Lisa M. Campbell, and Normand Goulet: Torngat Orogen — a Palaeoproterozoic example of a narrow doubly vergent collisional orogen / Geological Society, London, Special Publications, 112:117-136, doi:10.1144/GSL.SP.1996.112.01.07 --- R. J. Wardle and M. J. Van Kranendonk: The Palaeoproterozoic Southeastern Churchill Province of Labrador-Quebec, Canada: orogenic development as a consequence of oblique collision and indentation / Geological Society, London, Special Publications, 112:137-153, doi:10.1144/GSL.SP.1996.112.01.08 --- Andrew Kerr, Bruce Ryan, Charles F. Gower, Richard J. Wardle, and Andrew Kerr: The Makkovik Province: extension of the Ketilidian Mobile Belt in mainland North America / Geological Society, London, Special Publications, 112:155-177, doi:10.1144/GSL.SP.1996.112.01.09 --- B. Chadwick and A. A. Garde: Palaeoproterozoic oblique plate convergence in South Greenland: a reappraisal of the Ketilidian Orogen / Geological Society, London, Special Publications, 112:179-196, doi:10.1144/GSL.SP.1996.112.01.10 --- Charles F. Gower: The evolution of the Grenville Province in eastern Labrador, Canada / Geological Society, London, Special Publications, 112:197-218, doi:10.1144/GSL.SP.1996.112.01.11 --- Ian C. Starmer: Accretion, rifting, rotation and collision in the North Atlantic supercontinent, 1700-950 Ma / Geological Society, London, Special Publications, 112:219-248, doi:10.1144/GSL.SP.1996.112.01.12 --- A. Wikström, T. Skiöld, and B. Öhlander: The relationship between 1.88 Ga old magmatism and the Baltic-Bothnian shear zone in northern Sweden / Geological Society, London, Special Publications, 112:249-259, doi:10.1144/GSL.SP.1996.112.01.13 --- J. N. Connelly and K-I. Åhäll: The Mesoproterozoic cratonization of Baltica — new age constraints from SW Sweden / Geological Society, London, Special Publications, 112:261-273, doi:10.1144/GSL.SP.1996.112.01.14 --- J. F. Menuge and T. S. Brewer: Mesoproterozoic anorogenic magmatism in southern Norway / Geological Society, London, Special Publications, 112:275-295, doi:10.1144/GSL.SP.1996.112.01.15 --- J. N. Connelly, J. Berglund, and S. Å. Larson: Thermotectonic evolution of the Eastern Segment of southwestern Sweden: tectonic constraints from U-Pb geochronology / Geological Society, London, Special Publications, 112:297-313, doi:10.1144/GSL.SP.1996.112.01.16 --- Laurence M. Page, Michael B. Stephens, and Carl-Henric Wahlgren: 40Ar/39Ar geochronological constraints on the tectonothermal evolution of the Eastern Segment of the Sveconorwegian Orogen, south-central Sweden / Geological Society, London, Special Publications, 112:315-330, doi:10.1144/GSL.SP.1996.112.01.17 --- S. Mertanen, L. J. Pesonen, and H. Huhma: Palaeomagnetism and Sm-Nd ages of the Neoproterozoic diabase dykes in Laanila and Kautokeino, northern Fennoscandia / Geological Society, London, Special Publications, 112:331-358, doi:10.1144/GSL.SP.1996.112.01.18 --- Trevor F. Emmett: The provenance of pre-Scandian continental flakes within the Caledonide Orogen of south-central Norway / Geological Society, London, Special Publications, 112:359-366, doi:10.1144/GSL.SP.1996.112.01.19 --- W. R. Fitches, N. J. G. Pearce, J. A. Evans, and R. J. Muir: Provenance of late Proterozoic Dalradian tillite clasts, Inner Hebrides, Scotland / Geological Society, London, Special Publications, 112:367-377, doi:10.1144/GSL.SP.1996.112.01.20

Description / Table of Contents: Coalbed Methane Resources in USA and Europe --- D. Keith Murray: Coalbed methane in the USA: analogues for worldwide development / Geological Society, London, Special Publications, 109:1-12, doi:10.1144/GSL.SP.1996.109.01.01 --- Thomas G. Fails: Coalbed methane potential of some Variscan foredeep basins / Geological Society, London, Special Publications, 109:13-26, doi:10.1144/GSL.SP.1996.109.01.02 --- F. J. MacCarthy, R. M. Tisdale, and W. B. Ayers, Jr: Geological controls on coalbed prospectivity in part of the North Staffordshire Coalfield, UK / Geological Society, London, Special Publications, 109:27-42, doi:10.1144/GSL.SP.1996.109.01.03 --- J. L. Knight, B. J. Shevlin, D. C. Edgar, and P. Dolan: Coal thickness distributions on the UK continental shelf / Geological Society, London, Special Publications, 109:43-57, doi:10.1144/GSL.SP.1996.109.01.04 --- Dierk Juch: Assessment of West German hardcoal resources and its relation to coalbed methane / Geological Society, London, Special Publications, 109:59-65, doi:10.1144/GSL.SP.1996.109.01.05 --- U. Freudenberg, S. Lou, R. Schlüter, K. Schütz, and K. Thomas: Main factors controlling coalbed methane distribution in the Ruhr District, Germany / Geological Society, London, Special Publications, 109:67-88, doi:10.1144/GSL.SP.1996.109.01.06 --- James S. Marshall, Raymond C. Pilcher, and Carol J. Bibler: Opportunities for the development and utilization of coalbed methane in three coal basins in Russia and Ukraine / Geological Society, London, Special Publications, 109:89-101, doi:10.1144/GSL.SP.1996.109.01.07 --- Coal as a Reservoir --- R. A. Gayer, J. Pešek, I. Sýkorová, and P. Valterová: Coal clasts in the upper Westphalian sequence of the South Wales coal basin: implications for the timing of maturation and fracture permeability / Geological Society, London, Special Publications, 109:103-120, doi:10.1144/GSL.SP.1996.109.01.08 --- T. M. Hathaway and R. A. Gayer: Thrust-related permeability in the South Wales Coalfield / Geological Society, London, Special Publications, 109:121-132, doi:10.1144/GSL.SP.1996.109.01.09 --- C. I. Pattison, C. R. Fielding, R. H. McWatters, and L. H. Hamilton: Nature and origin of fractures in Permian coals from the Bowen Basin, Queensland, Australia / Geological Society, London, Special Publications, 109:133-150, doi:10.1144/GSL.SP.1996.109.01.10 --- Basim S. M. Faraj, Chris R. Fielding, and Ian D. R. Mackinnon: Cleat mineralization of Upper Permian Baralaba/Rangal Coal Measures, Bowen Basin, Australia / Geological Society, London, Special Publications, 109:151-164, doi:10.1144/GSL.SP.1996.109.01.11 --- Paul Gamson, Basil Beamish, and David Johnson: Coal microstructure and secondary mineralization: their effect on methane recovery / Geological Society, London, Special Publications, 109:165-179, doi:10.1144/GSL.SP.1996.109.01.12 --- Ian H. Harris, Gareth A. Davies, Rodney A. Gayer, and Keith Williams: Enhanced methane desorption characteristics from South Wales anthracites affected by tectonically induced fracture sets / Geological Society, London, Special Publications, 109:181-196, doi:10.1144/GSL.SP.1996.109.01.13 --- Jeffrey R. Levine: Model study of the influence of matrix shrinkage on absolute permeability of coal bed reservoirs / Geological Society, London, Special Publications, 109:197-212, doi:10.1144/GSL.SP.1996.109.01.14 --- M. I. Davidson, R. Bryant, and D. J. A. Williams: Characterization of anthracite / Geological Society, London, Special Publications, 109:213-225, doi:10.1144/GSL.SP.1996.109.01.15 --- Pavel Konečhný and Alena Kožušníková: Measurement of gas permeability of coal and clastic sedimentary rocks under triaxial stress conditions / Geological Society, London, Special Publications, 109:227-229, doi:10.1144/GSL.SP.1996.109.01.16 --- A. Kožušníková: Relationship between the hydrogen content of coal and the lithological characteristics of rocks overlying the coal seam / Geological Society, London, Special Publications, 109:231-236, doi:10.1144/GSL.SP.1996.109.01.17 --- Coal Geological Studies Related to Coalbed Methane --- Edward Lester, Martin Allen, Michael Cloke, and Brian Atkin: Analysis of the problems associated with the use of image analysis for microlithotype analysis on solid coal mounts / Geological Society, London, Special Publications, 109:237-248, doi:10.1144/GSL.SP.1996.109.01.18 --- I. Sýkorová, M. Novotná, H. Pavlíková, and V. Machovič: Petrological and spectroscopic structural characteristics of Bohemian and Moravian coals and their possible relation to gas proneness / Geological Society, London, Special Publications, 109:249-260, doi:10.1144/GSL.SP.1996.109.01.19 --- Grzegorz J. Nowak: Petrological coal seam accumulation model for the Zacler Formation of the Lower Silesian coal basin, southwestern Poland / Geological Society, London, Special Publications, 109:261-286, doi:10.1144/GSL.SP.1996.109.01.20 --- J. Barraza, A. Gilfillan, M. Cloke, and D. Clift: Minerals and major elements in density-separated coal fractions from Point of Ayr coal, Wales, UK / Geological Society, London, Special Publications, 109:287-299, doi:10.1144/GSL.SP.1996.109.01.21 --- Irena Kostova, Ognyan Petrov, and Jordan Kortenski: Mineralogy, geochemistry and pyrite content of Bulgarian subbituminous coals, Pernik Basin / Geological Society, London, Special Publications, 109:301-314, doi:10.1144/GSL.SP.1996.109.01.22 --- Duncan McLean and Iain Murray: Subsurface correlation of Carboniferous coal seams and inter-seam sediments using palynology: application to exploration for coalbed methane / Geological Society, London, Special Publications, 109:315-324, doi:10.1144/GSL.SP.1996.109.01.23 --- A. I. Karayigit, E. Eris, and E. Cicioglu: Coal geology, chemical and petrographical characteristics, and implications for coalbed methane development of subbituminous coals from the Sorgun and Suluova Eocene basins, Turkey / Geological Society, London, Special Publications, 109:325-338, doi:10.1144/GSL.SP.1996.109.01.24