ALBERT

Description / Table of Contents: PREFACE Following the economical and social development of the local communities, mountain regions of temperate climates are increasingly becoming the site of valuable infrastructures and important urban and industrial settlements. As the catastrophic events of last years in the European Alps have clearly shown, the vulnerability of these territories has correspondingly increased, in terms of both property damage and losses of human life. Until recently, the hydraulic scientific community has paid little attention to mountain watersheds, except perhaps during the period if the hydropower development. Nevertheless attention was then focused on problems and methodologies somewhat different from the issues of actual environmental concern. More recently, however, hydraulic engineers have joined their colleagues from forest and rural engineering, who have traditionally dealt with erosion control in mountain areas, to bring in their own methodology, already experienced in lowland rivers. At the same time, academic people focused an interest in some phenomena, like massive transport, which is typical of mountain environment. To bring together all these contributions and to make the state of the art of the mountain river science (oropotamology) and technology, an International Workshop was called at the University of Trent (Italy), on October 1989, under the sponsorship of Fluvial Hydraulic Section of the IAHR. Three main topics have been recognized as particularly relevant from the point of view of both research and professivnal people: a) Hydrodynamics of steep channels and local scale process; b) Sediment movement and sediment training, with special emphasis on massive transport; c) Particular features of sediment transport related to non-uniform grain-size. However, as it is the case in these circumstances, the contest of several contributions often spread over more than one topic. In the following Introduction to papers, the three topics were split into 11 Sections, each one devoted to a more particular aspect recurrently addressed during the discussion. The same paper, thus, may be mentioned in different Sections of the Introduction.

Description / Table of Contents: Introduction / Pages 1-32 --- Interpretation using nomograms / Pages 33-47 --- Linear parameters / Pages 49-114 --- Non-linear parameters / Pages 115-173 --- Maximum likelihood and maximum entropy / Pages 175-193 --- Analytic inversion / Pages 195-211 --- Advanced inversion methods / Pages 213-227 --- Error analysis / Pages 229-243 --- Parallel computation in modelling and inversion / Pages 245-255

Description / Table of Contents: PREFACE This book represents the first attempt in three decades to marshall out available information on the regional geology of Africa for advanced undergraduates and beginning graduate students. Geologic education in African universities is severely hampered by the lack of a textbook on African regional geology. This situation is greatly exacerbated by the inability of most African universities to purchase reference books and maintain journal subscriptions. Besides, geologic information about Africa is so widely dispersed that a balanced and comprehensive course content on Africa is beyond the routine preparation of lecture notes by university teachers. Since geology is a universal subject and Africa is one of the largest landmasses on Earth with one of the longest continuous records of Earth history, there is no doubt that geologic education in other parts of the world will benefit from a comprehensive presentation of African geologic case histories. The scope of this text also addresses the need of the professional geologist, who may require some general or background information about an unfamiliar African geologic region or age interval. Africa occupies a central position in the world's mineral raw materials trade. Because of its enormous extent and great geologic age, the diversity and size of Africa's mineral endowment is unparalleled. Africa is the leading source of gold, diamond, uranium, and dominates the world's supply of strategic minerals such as chromium, manganese, cobalt, and platinum. Consequently, African nations from Algeria to Zimbabwe depend solely on mineral exports for economic survival. The geologic factors which govern economic mineral deposits are stressed in this text. The geological history of Africa spans 3.8 billion years, a record that is unique both in duration and continuity. Few other parts of our planet match the plethora of geologic phenomena and processes that are displayed in the African continent. From the various stages of crustal evolution decipherable from the Archean of southern Africa, through the plate tectonics scenarios in the ubiquitous Late Proterozoic-Early Paleozoic Pan-African mobile belts and in the Hercynian and Alpine orogenies of northwest Africa, to the East African Rift Valley, Africa is replete with excellent examples and problems for a course on regional tectonics. Teachers of igneous and metamorphic petrology can hardly ignore Africa's anorogenic magmatism (e.g.. layered ultramafic intrusives such as the Great Dyke and the Bushveld Complex; the Tete gabbro-anorthosite pluton; alkaline complexes; basaltic volcanism), or tantalizing highgrade metamorphic terranes such as the Limpopo belt, the Namaqua mobile belt, and the Mozambique belt. From the extensive Precambrian supracrustal sequences throughout the continent with enormous thicknesses of sedimentary rocks that have hardly been deformed or metamorphosed, to the stratigraphic evolution of Africa's present-day passive continental margin, there is a complete spectrum of facies models upon which to base a course on basin analysis and stratigraphy. To maintain its integrity a course on historical geology anywhere in the world must address the theory of Continental Drift beyond invoking past continuities between West Africa and South America. Past connections between West Africa and eastern North America must equally be explored, so also connections between northeast Africa and Arabia, and the paleogeography of southern Gondwana where Africa occupied centre stage. The Precambrian fossil record, the transitions from reptiles to the earliest mammals and dinosaurs, and the evolution of Man are among Africa's unique contributions to the history of life and the story of organic evolution. Although it lies today in the tropics Africa was the theatre of the Earth's most-spectacular glaciations. Even after the scene of continental glaciation had shifted to the northern continents only lately during the Pleistocene, Africa still witnessed spectacular climatic fluctuations during the Quaternary. Certainly students of archeology and paleoanthropology cannot overlook the Quaternary paleoenvironmental record of the Olduvai Gorge in Tanzania, the Lake Turkana basin in Kenya, the Nile valley, the Sahara, and southern Africa. But since African examples have already been cited in standard geologic textbook, I have often been asked why it has become necessary to revive the idea of a full-length textbook on African geology, 30 years after this idea was abandoned by the geologic community. My simple answer, as already stated, is that the wealth of available geologic information about Africa is so enormous and fascinating, but so diffuse, that an attempt must be made to assemble and pass on this knowledge.

Description / Table of Contents: PREFACE Sedimentation as a Three-Component System describes the most common styles of deposition in marine environments as they relate to sediment composition. Three components, organic matter, carbonate, and siliciclastic sediment, may settle concurrently, but at different rates, intermixing on the sea floor to form a particular sediment composition. A change in the flux of one component is capable of relatively diluting or concentrating the other two components, which can be expressed in the characteristic ratio of organic carbon to carbonate in the resulting sediment. The basic concept of this book is to address organic carbon-carbonate associations in terms of depositional inputs and time spans. In addition, the three-component system describes organic carbon changes related to major facies transitions. Examples include models of the genesis of carbonaceous sediments, with their various laminated to bioturbated lithotypes, and numerical organic carbon prediction. I hope that this book will encourage stimulating discussions and promote a new approach to quantitative stratigraphy...

Description / Table of Contents: Synthetic Discussions --- Geophysical Studies of the Northern Cascadia Subduction Zone off Western Canada and Their Implications for Great Earthquake Seismotectonics: A Review / Ron M. Clowes and Roy D. Hyndman / pp. 1-23 --- Understanding the Seismotectonics of the Cascadia Subduction Zone: Overview and Recent Seismic Work / Thomas L. Pratt, Craig S. Weaver, Thomas M. Brocher, Thomas Parsons, Michael A. Fisher, Kenneth C. Creager, Robert S. Crosson, Roy D. Hyndman, George Spence, Anne M. Tréhu, Kate C. Miller and Uri S. TEN Brink / pp. 25-36 --- Long-Term Probabilistic Forecast in Japan and Time-Predictable Behavior of Earthquake Recurrence / Kunihiko Shimazaki / pp. 37-43 --- Recipe for Estimating Strong Ground Motions from Active Fault Earthquakes / Kojiro Irikura / pp. 45-55 --- Seismic Velocity --- New Features of Island Arc Crust Inferred from Seismic Refraction/Wide-Angle Reflection Expeditions in Japan / Takaya Iwasaki, Toshikatsu Yoshii, Naoshi Hirata and Hiroshi Sato / pp. 57-70 --- Seeking the Cause of Large Crustal Earthquakes in Japan: Influence of Arc Magma and Fluids / Dapeng Zhao / pp. 71-91 --- Conductivity --- Stress, Stress Release and Geoelectromagnetism / Fiona Simpson / pp. 93-106 --- Network-MT Survey in Japan to Determine Nation-Wide Deep Electrical Conductivity Structure / Makoto Uyeshima, Masahiro Ichiki, Ikuko Fujii, Hisashi Utada, Yasunori Nishida, Hideyuki Satoh, Masaaki Mishina, Tadashi Nishitani, Satoru Yamaguchi, Ichiro Shiozaki, Hideki Murakami and Naoto Oshiman / pp. 107-121 --- Understanding of Seismic Activity Using Conductivity Data in the Central Part of Northeastern Japan / Yukio Fujinawa, Noriaki Kawakami, Jun Inoue, Theodore H. Asch, Shinji Takasugi and Yoshimori Honkura / pp. 123-140 --- Crustal Activity --- Monitoring of Crustal Deformation in Japan Using L-band SAR Interferometry / Makoto Murakami, Satoshi Fujiwara, Takuya Nishimura, Mikio Tobita, Hiroyuki Nakagawa, Shinzaburo Ozawa and Masaki Murakami / pp. 141-146 --- Detection of a Coupling State in the Tokai Plate-Subducting Region Based on Microearthquake Seismicity and on Crustal Deformation / Shozo Matsumura / pp. 147-155 --- Coseismic Slip Distribution of the 1944 Tonankai and 1946 Nankai Earthquakes / Yuichiro Tanioka / pp. 157-165 --- The Southern California Integrated GPS Network (SCIGN) / Kenneth W, Hudnut, Yehuda Bock, John E. Galetzka, Frank H. Webb and William H. Young / pp. 167-189 --- Crustal Movement in Southwest Japan, Deduced from Continuous GPS Measurements, and Its Seismotectonic Implications / Kaoru Miyashita, Jianxin Li and Takashi Kawachi / pp. 191-200 --- Active Faults --- Deep Geometry and Evolution of Active Faults in Northern Honshu, Japan / Hiroshi Sato, Naoshi Hirata And Takaya Iwasaki / pp. 201-207 --- Rupturing History of Active Faults during the Last 1000 Years in the Central Japan / Eikichi Tsukuda / pp. 209-218 --- Active Faulting, Lower Crustal Delamination and Ongoing Hidaka Arc-Arc Collision, Hokkaido, Japan / Tanio Ito / pp. 219-224 --- Seismotectonics in the Subduction Zone: Japan --- Inhomogeneous Structure of the Crust and Its Relationship to Earthquake Occurrence / Norihito Umino and Akira Hasegawa / pp. 225-235 --- Configuration of the Philippine Sea Slab and Seismic Activity in the Tokai Region, Central Japan / Satoshi Harada and Akio Yoshida / pp. 237-246 --- On-Line Operating Network of the High Gain Seismometers and Tsunami Sensors, Deployed at the Sea-Floor of the Sagami Trough Subduction Zone, Central Japan / Takao Eguchi, Yukio Fujinawa, Eisuke Fujita, Sin-Iti Iwasaki, Isao Watabe, Hiroaki Negishi and Hiroyuki Fujiwara / pp. 247-260 --- Seismotectonics around the Active Convergent Zones --- Seismotectonics of the Frontal Himalaya through the Electrical Conductivity Imaging / B. R. Arora / pp. 261-272 --- Models of Subduction Zones --- A Simple Review on the Simulation of Earthquake Cycle at Subduction Zones / Kazuro Hirahara / pp. 273-282 --- Systematic Variations in Non-Local Seismicity Patterns in Southern California / K. F. Tiampo, J. B. Rundle, S. McGinnis, W. Klein and S. J. Gross / pp. 283-292 --- Earthquake in Turkey --- Deep Resistivity Structure around the Fault Associated with the 1999 Kocaeli Earthquake, Turkey / N. Oshiman, R. Yoshimura, T. Kasaya, Y. Honkura, M. Matsushima, S. Baris, C. Celik, M. K. Tuncer and A. M. Isikara / pp. 293-303 --- S Wave Splitting Observation inside of the North Anatolian Fault, Turkey / Keiichi Tadokoro, Masataka Ando, Serif Baris, Kin'ya Nishigami, Mamoru Nakamura, S. Balamir Ücer, Akihiko Ito, Yoshimori Honkura and A. Mete Isikara / pp. 305-310 --- Earthquake in Taiwan --- Drilling the Chelungpu Fault, Taiwan: Cores and Heat-Flow from a Thrust-Fault with Very Large Displacements in a Recent Earthquake / Masataka Ando, James Mori, Hidemi Tanaka and Kuo-Fong Ma / pp. 311-317 --- The Ms7.6 Chi-Chi, Taiwan, Earthquake of September 20, 1999 / J.-H. Wang, R.-D. Hwang, B.-S. Huang, K.-C. Chen, W.-G. Huang, and T.-M. Chang / pp. 319-324 --- Some Observations about the Chi-Chi, Taiwan Earthquake of September 21, 1999 / Yi-Ben Tsai / pp. 325-366 --- In-situ Measurements to Understand Seismotectonics in the Subduction Zone --- Borehole Observatories into Subduction Seismogenic Zones / Kiyoshi Suyehiro / pp. 367-374 --- Continental Scientific Drilling for Studying Plate Subduction Earthquakes / Ryuji Ikeda / pp. 375-382 --- Scismotectonics Applied to Earthquake Hazard Mitigation --- Stress Drop Distribution of Micro-Earthquakes at Ootaki, Nagano Prefecture, Japan, Obtained from Waveform Data by Borehole Stations / Shigeki Horiuchi and Yoshihisa Iio / pp. 383-391 --- Site Amplification of' K-NET Sites in the Kanto Region, Central Japan / Shigeo Kinoshita and Yousuke Ogue / pp. 393-405 --- Caltech-USGS Element of TriNet: Remote Stations, Communications, and Data Acquisition / E. Hauksson, P. Maechling, R. Busby and H. Kanamori / pp. 407-423 --- Microzoning Studies for Seismic Risk Mitigation / Kazuoh Seo, Diana Polonska, Katsumi Kurita and Kentaro Motoki / pp. 425-450 --- Earthquake Clusters in the Kanto and Tokai Subduction Zones: Implications for Modes of Plate Consumption / Shin-ichi Noguchi / pp. 451-467 --- Seismic Scattering from Small-Scale Heterogeneities: Numerical Simulations and Observation / Kiyoshi Yomogida / pp. 469-480 --- Tectonic Characteristics of Seismogenic Stress Field in East Asia / Jiren Xu, Zhixin Zhao and Kazuo Oike / pp. 481-497

Description / Table of Contents: Geophysicists use seismic signals to image structures in the Earth's interior, to understand the mechanics of earthquake and volcanic sources, and to estimate their associated hazards. Keiiti Aki developed pioneering quantitative methods for extracting useful information from various portions of observed seismograms and applied these methods to many problems in the above fields. This volume honors Aki's contributions with review papers and results from recent applications by his former students and scientific associates pertaining to topics spawned by his work. Discussed subjects include analytical and numerical techniques for calculating dynamic rupture and radiated seismic waves, stochastic models used in engineering seismology, earthquake and volcanic source processes, seismic tomography, properties of lithospheric structures, analysis of scattered waves, and more. The volume will be useful to students and professional geophysicists alike.

Description / Table of Contents: Exciting developments in earthquake science have benefited from new observations, improved computational technologies, and improved modeling capabilities. Designing models of the earthquake of the earthquake generation process is a grand scientific challenge due to the complexity of phenomena and range of scales involved from microscopic to global. Such models provide powerful new tools for the study of earthquake precursory phenomena and the earthquake cycle. Through workshops, collaborations and publications the APEC Cooperation for Earthquake Simulations (ACES) aims to develop realistic supercomputer simulation models for the complete earthquake generation process, thus providing a "virtual laboratory" to probe earthquake behavior. Part I of the book covers microscopic simulations, scaling physics and earthquake generation and cycles. This part also focuses on plate processes and earthquake generation from a macroscopic standpoint.

Description / Table of Contents: Exciting developments in earthquake science have benefited from new observations, improved computational technologies, and improved modeling capabilities. Designing models of the earthquake generation process is a grand scientific challenge due to the complexity of phenomena and range of scales involved from microscopic to global. Such models provide powerful new tools for the study of earthquake precursory phenomena and the earthquake cycle. Through workshops, collaborations and publications, the APEC Cooperation for Earthquake Simulations (ACES) aims to develop realistic supercomputer simulation models for the complete earthquake generation process, thus providing a "virtual laboratory" to probe earthquake behavior. Part II of the book embraces dynamic rupture and wave propagation, computational environment and algorithms, data assimilation and understanding, and applications of models to earthquakes. This part also contains articles on the computational approaches and challenges of constructing earthquake models.

Description / Table of Contents: This volume presents summaries of recent research results on the related subjects of source processes and explosion yield estimation, which are important elements of any treaty verification system. The term Source Processes, in the context of nuclear test monitoring, refers to a wide range of research topics. In a narrow definition, it describes the complex physical phenomena that are directly associated with a nuclear explosion, and the catastrophic deformation and transformation of the material surrounding the explosion. In a broader sense, it includes a host of topics related to the inference of explosion phenomena from seismic and other signals. A further widening of the definition includes the study and characterization of source processes of events other than nuclear, such as earthquakes and, in particular, mining explosions. This latter research is especially important relative to the question of identifying and discriminating nuclear explosions from other seismic events. Explosion Yield Estimation deals with the corresponding inverse problem of inferring explosion source characteristics through analyses of the various types of seismic signals produced by the explosion. This is a complex technical task which has been the focus of some of the most contentious treaty monitoring debates. The current compilation of eight articles on Source Processes and six articles on Explosion Yield Estimation gives a good representation of state-of-the-art research currently being conducted in the broad area of seismic source characterization in the context of nuclear test monitoring.

Description / Table of Contents: The topics included in this issue deal with many aspects of volcanic and seismic activity, two of the natural hazards of geological origin that have the greatest impact and pose the predominant risk to society. This book comprises eighteen papers, most of which were presented at an international seminar organized and held at the Complutense University of Madrid in October 2001. The papers address geodetic, geophysical and geochemical effects caused by seismic and volcanic activity; monitoring of volcanic and seismic processes using space and terrestrial techniques; complementarity of these techniques; theoretical modelling of volcanic and seismic processes; inverse problem; interpretation of observations; hazards; seismicity patterns and application.