ALBERT

Description / Table of Contents: Geodynamics concerns with the dynamics of the global motion of the earth, of the motion in the earth's interior and its interaction with surface features, together with the mechanical processes in the deformation and rupture of geological structures. Its final object is to determine the driving mechanism of these motions which is highly interdisciplinary. In preparing the basic geological, geophysical data required for a comprehensive mechanical analysis, there are also many mechanical problems involved, which means the problem is coupled in a complicated manner with geophysics, rock mechanics, seismology, structural geology etc. This topical issue is Part I of the Proceedings of an IUTAM / IASPEI Symposium on Mechanics Problems in Geodynamics held in Beijing, September 1994. It addresses different aspects of mechanics problems in geodynamics involving tectonic analyses, lithospheric structures, rheology and the fracture of earth media, mantle flow, either globally or regionally, and either by forward or inverse analyses or numerical simulation.

Description / Table of Contents: The special issue contains contributions presented at the international workshop Seismic waves in laterally inhomogeneous media IV, which was held at the Castle of Trest, Czech Republic, May 22-27, 1995. The workshop, which was attended by about 100 seismologists from more than 10 countries, was devoted mainly to the current state of theoretical and computational means of study of seismic wave propagation in complex structures. The special issue can be of interest for theoretical, global and explorational seismologists. The first part contains papers dealing with the study and the use of various methods of solving forward and inverse problems in complicated structures. Among other methods, discrete-wave number method, the finite-difference method, the edge-wave supperposition method and the ray method are studied and used. Most papers contained in the second part are related to the ray method. The most important topics are two-point ray tracing, grid calculations of travel times and amplitudes and seismic wave propagation in anisotropic media.

Description / Table of Contents: Induced seismic events are of high scientific and economic significance. They are the result of human activities interacting with regional and local tectonics, changing the local crustal stress state by mining, extraction of rock masses, injection of fluids into the rock massif, and by changing the surface loading and pore pressure state near large reservoirs. Within Europe the study of induced seismic events has a long tradition and international scientific organizations have actively stimulated the co-operation in this field. During its General Assembly in September 1994, the European Seismological Society organized the symposium "Induced Seismic Events". The focus of this symposium was concentrated on induced events in central and eastern Europe, as well as in the former Soviet Union. The major contributions to the symposium, and also some Chinese, Canadian, and South African results are presented here. Case studies as well as data analyses and methodological studies are included. Seismologists and specialists working in the field of geohazard prevention will find much information in this volume that is pertinent to their work.

Description / Table of Contents: A workshop on Induced Seismicity was organized during the 27th General Assembly of the International Association of Seismology and Physics of Earth's Interior (IASPEI) in Wellington, New Zealand during January 10-21, 1994. This volume presents a collection of 16 papers accepted for publication which accrued from this workshop. The first three papers address mining activity related to induced seismicity. The fourth paper deals with water injection induced seismic activity, while the remaining 12 papers treat several aspects of water reservoir induced earthquakes. Globally, the Koyna dam creating Shivajisagar Lake in Maharashtra, India, continues to be the most significant site of reservoir-induced earthquakes. With the increase in the number of cases of induced seismicity, there is a growing concern among planners, engineers, geophysicists and geologists to understand the environment conducive to this phenomenon. While the changes in pore-fluid pressure have been identified as the key factor in inducing earthquakes, the phenomenon itself is still poorly understood. This reality thus makes the study of the induced seismicity very important and this volume timely.

Description / Table of Contents: The special issue contains contributions presented at the international workshop Seismic waves in laterally inhomo- geneous media IV, which was held at the Castle of Trest, Czech Republic, May 22-27, 1995. The workshop, which was attended by about 100 seismologists from more than 10 countries, was devoted mainly to the current state of theoretical and computational means of study of seismic wave propagation in complex structures. The special issue can be of interest for theoretical, global and explorational seismologists. The first part contains papers dealing with the study and the use of various methods of solving forward and inverse problems in complicated structures. Among other methods, discrete-wave number method, the finite-difference method, the edge-wave supperposition method and the ray method are studied and used. Most papers contained in the second part are related to the ray method. The most important topics are two-point ray tracing, grid calculations of travel times and amplitudes and seismic wave propagation in anisotropic media.

Description / Table of Contents: This volume contains 18 papers from 8 countries dealing with different aspects of triggered and induced seismicity. In situ observations of the phenomenon include examples of seismicity due to reservoirs, hard-rock mines, coal mines, mine collapses, brine production caverns, fluid injections, and geothermal hot-dry-rock projects. High-frequency acoustic emission studies from laboratory experiments and hard-rock mines have also been reported. Besides providing case studies of previously unavailable observations of seismicity, the present volume contains investigations of the causes and source mechanism of seismic events, determination of source parameters, seismic hazard as related to the design of support systems for underground openings and procedures for closure of brine production caverns, and the use of seismic and non-destructive techniques in assessing rock damage, measuring dynamic elastic moduli and detecting discontinuities. This collection of papers provides an excellent indication of the state of the art, recent developments and outstanding challenges facing scientists and engineers in understanding the causes and alleviating the effects of induced seismicity.

Description / Table of Contents: The perturbation of the earth by mankind causes earthquakes in a variety of situations. This phenomenon continues to be a major concern to engineers and scientists concerned with the mitigation of the consequences of this seismicity, as well as better understanding the processes at its origin. The present volume contains twelve papers from six countries, dealing with observations of triggered and induced seismicity in four continents. The reported cases include seismicity due to hard-rock mines, coal mines, underground research facilities for nuclear waste disposal, water injections, reservoirs, acquifers and oil fields. This volume provides case studies of previously unavailable observations of this phenomenon, investigations of the cause and source mechanism of seismic events, studies of source location distributions, determinations of seismic source parameters, cases of the use of such parameters in assessing rockburst hazard in mines, and measurements of velocity an attenuation properties of rock masses. The present collection of papers provides an excellent indication of the current state of the art and new developments in this area of research.

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: General --- David J. Bottjer, Jennifer K. Schubert, and Mary L. Droser: Comparative evolutionary palaeoecology: assessing the changing ecology of the past / Geological Society, London, Special Publications, 102:1-13, doi:10.1144/GSL.SP.1996.001.01.01 --- Erle G. Kauffman and Peter J. Harries: The importance of crisis progenitors in recovery from mass extinction / Geological Society, London, Special Publications, 102:15-39, doi:10.1144/GSL.SP.1996.001.01.02 --- Peter J. Harries, Erle G. Kauffman, and Thor A. Hansen: Models for biotic survival following mass extinction / Geological Society, London, Special Publications, 102:41-60, doi:10.1144/GSL.SP.1996.001.01.03 --- Valentin A. Krassilov: Recovery as a function of community structure / Geological Society, London, Special Publications, 102:61-63, doi:10.1144/GSL.SP.1996.001.01.04 --- E. A. Jarzembowski and A. J. Ross: Insect origination and extinction in the Phanerozoic / Geological Society, London, Special Publications, 102:65-78, doi:10.1144/GSL.SP.1996.001.01.05 --- Palaeozoic --- Andrey Yu. Zhuravlev: Reef ecosytem recovery after the Early Cambrian extinction / Geological Society, London, Special Publications, 102:79-96, doi:10.1144/GSL.SP.1996.001.01.06 --- F. M. Swain: Ostracode speciation following Middle Ordovician extinction events, north central United States / Geological Society, London, Special Publications, 102:97-104, doi:10.1144/GSL.SP.1996.001.01.07 --- H. A. Armstrong: Biotic recovery after mass extinction: the role of climate and ocean-state in the post-glacial (Late Ordovician-Early Silurian) recovery of the conodonts / Geological Society, London, Special Publications, 102:105-117, doi:10.1144/GSL.SP.1996.001.01.08 --- William B. N. Berry: Recovery of post—Late Ordovician extinction graptolites: a western North American perspective / Geological Society, London, Special Publications, 102:119-126, doi:10.1144/GSL.SP.1996.001.01.09 --- Dimitri Kaljo: Diachronous recovery patterns in Early Silurian corals, graptolites and acritarchs / Geological Society, London, Special Publications, 102:127-133, doi:10.1144/GSL.SP.1996.001.01.10 --- Petr Čejchan and Jindřich Hladil: Searching for extinction/recovery gradients: the Frasnian-Famennian interval, Mokrá Section, Moravia, central Europe / Geological Society, London, Special Publications, 102:135-161, doi:10.1144/GSL.SP.1996.001.01.11 --- Michael R. House: Juvenile goniatite survival strategies following Devonian extinction events / Geological Society, London, Special Publications, 102:163-185, doi:10.1144/GSL.SP.1996.001.01.12 --- O. L. Kossovaya: The mid-Carboniferous rugose coral recovery / Geological Society, London, Special Publications, 102:187-199, doi:10.1144/GSL.SP.1996.001.01.13 --- William A. DiMichele and Tom L. Phillips: Climate change, plant extinctions and vegetational recovery during the Middle-Late Pennsylvanian Transition: the Case of tropical peat-forming environments in North America / Geological Society, London, Special Publications, 102:201-221, doi:10.1144/GSL.SP.1996.001.01.14 --- Mesozoic --- Douglas H. Erwin and P. Hua-Zhang: Recoveries and Radiations: Gastropods After the Permo-Triassic Mass Extinction / Geological Society, London, Special Publications, 102:223-229, doi:10.1144/GSL.SP.1996.001.01.15 --- A. Hallam: Recovery of the marine fauna in Europe after the end-Triassic and Early Toarcian mass Extinctions / Geological Society, London, Special Publications, 102:231-236, doi:10.1144/GSL.SP.1996.001.01.16 --- A. Tewari, M. B. Hart, and M. P. Watkinson: Foraminiferal recovery after the mid-Cretaceous oceanic anoxic events (OAEs) in the Cauvery Basin, southeast India / Geological Society, London, Special Publications, 102:237-244, doi:10.1144/GSL.SP.1996.001.01.17 --- Danuta Peryt and Marcos Lamolda: Benthonic foraminiferal mass extinction and survival assemblages from the Cenomanian-Turonian Boundary Event in the Menoyo Section, northern Spain / Geological Society, London, Special Publications, 102:245-258, doi:10.1144/GSL.SP.1996.001.01.18 --- Nataliya A. Tur: Planktonic foraminifera recovery from the Cenomanian-Turonian mass extinction event, northeastern Caucasus / Geological Society, London, Special Publications, 102:259-264, doi:10.1144/GSL.SP.1996.001.01.19 --- M. B. Hart: Recovery of the food chain after the Late Cenomanian extinction event / Geological Society, London, Special Publications, 102:265-277, doi:10.1144/GSL.SP.1996.001.01.20 --- M. E. J. Fitzpatrick: Recovery of Turonian dinoflagellate cyst assemblages from the effects of the oceanic anoxic event at the end of the Cenomanian in southern England / Geological Society, London, Special Publications, 102:279-297, doi:10.1144/GSL.SP.1996.001.01.21 --- Elena A. Yazykova: Post-crisis recovery of Campanian desmoceratacean ammonites from Sakhalin, far east Russia / Geological Society, London, Special Publications, 102:299-307, doi:10.1144/GSL.SP.1996.001.01.22 --- Carl F. Koch: Latest Cretaceous mollusc species ‘fabric’ of the US Atlantic and Gulf Coastal Plain: a baseline for measuring biotic recovery / Geological Society, London, Special Publications, 102:309-317, doi:10.1144/GSL.SP.1996.001.01.23 --- Cenozoic --- Eduardo A. M. Koutsoukos: Phenotypic experiments into new pelagic niches in early Danian planktonic foraminifera: aftermath of the K/T boundary event / Geological Society, London, Special Publications, 102:319-335, doi:10.1144/GSL.SP.1996.001.01.24 --- E. M. Bugrova: Recovery of North Caucasus foraminiferal assemblages after the pre-Danian extinctions / Geological Society, London, Special Publications, 102:337-342, doi:10.1144/GSL.SP.1996.001.01.25 --- R. P. Speijer and G. J. Van Der Zwaan: Extinction and survivorship of southern Tethyan Benthic foraminifera across the Cretaceous/Palaeogene boundary / Geological Society, London, Special Publications, 102:343-371, doi:10.1144/GSL.SP.1996.001.01.26 --- Patricia H. Kelley and Thor A. Hansen: Recovery of the naticid gastropod predator-prey system from the Cretaceous-Tertiary and Eocene-Oligocene extinctions / Geological Society, London, Special Publications, 102:373-386, doi:10.1144/GSL.SP.1996.001.01.27

Description / Table of Contents: Geodynamics concerns the dynamics of the earth's global motion, of the earth's interior motion and its interaction with surface features, together with the mechanical processes in the deformation and rupture of geological structures. Its final object is to determine the driving mechanism of these motions. It is highly interdisciplinary. In providing the basic geological, geophysical infromation required for a comprehensive mechanical analysis, there are also many mechanical problems involved, which means the problem is coupled intricately with geophysics, rock mechanics, seismology, structural geology, etc. This is Part II of the Proceedings of an IUTAM/IASPEI Symposium on Mechanics Problems in Geodynamics held in Beijing, September 1994. It discusses different aspects of mechanics problems in geodynamics involving the earth's rotation, tectonic analyses of various parts of the world, mineral physics and flow in the mantle, seismic source studies and wave propagation and application of the DDA method in tectonic analysis.

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: 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.