Author
Edward A. Keller
Other affiliations: California State University, Fresno, University of North Carolina at Charlotte, Purdue University
Bio: Edward A. Keller is an academic researcher from University of California, Santa Barbara. The author has contributed to research in topics: Anticline & Debris. The author has an hindex of 32, co-authored 104 publications receiving 5996 citations. Previous affiliations of Edward A. Keller include California State University, Fresno & University of North Carolina at Charlotte.
Topics: Anticline, Debris, Fold (geology), Fault scarp, Fault (geology)
Papers published on a yearly basis
Papers
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Book•
22 Aug 1995
TL;DR: In this article, the authors discuss the effect of earthquakes on the geomorphology of active tectonic models and their application in the prediction of future earthquakes, and present a model for predicting future earthquakes.
Abstract: (NOTE: Each chapter concludes with Summary and References Cited.) 1. Introduction to Active Tectonics: Emphasizing Earthquakes. Active Tectonics. Global Tectonic. Earthquakes and Related Phenomena. Magnitude and Intensity of Earthquakes. Seismic Waves. Material Amplification. Directivity. Active Fault Zones. Estimation of Seismic Risk. Effects of Earthquakes. Earthquakes Caused by Human Activity. The Earthquake Cycle. Predicting Ground Motion. 2. Landforms, Tectonic Geomorphology, and Quaternary Chronology. Tectonic Geomorphology. Geomorphic Concepts. Tectonic Geomorphology and Faulting. Pleistocene and Holocene Chronology. 3. Geodesy. Introduction. Principles of Geodesy. Geodetic Techniques. Applications. 4. Geomorphic Indices of Active Tectonics. Introduction. Hypsometric Curve and Hypsometric Integral. Drainage Basic Asymmetry. Stream Length-Gradient Index (SL). Mountain-Front Sinuosity (Smf). Ratio of Valley-Floor Width to Valley Height (Vf). Alluvial Fans and Tectonic Activity at Mountain Fronts. Relic Mountain Fronts. Classification of Relative Tectonic Activity. 5. Active Tectonics and Rivers. Introduction. Fluvial Responses to Tectonic Modification. Models of Tectonic Adjustment. 6. Active Tectonics and Coastlines. Introduction. Coastal Landforms. Coseismic Deformation. Coastal Geomorphology and Sea Level. Long-Term Uplift. Deformation of Coastal Terraces. Lake Shorelines. Dating Coastal Landforms. Coastal Tectonics and Time Scale. 7. Active Folding and Earthquakes. Introduction. Fold-and-Thrust Belts. Flexural-Slip Faults. Folding and Strike-Slip Faulting. Tectonic Geomorphology of Active Folds. Case Study: Wheeler Ridge Anticline. Case Study: Ventura Avenue Anticline. 8. Paleoseismology and Earthquake Prediction. Paleoseismology. Evidence for Paleoearthquakes. Fault-Zone Segmentation. Case Study: Segmentation and Paleoseismicity of the Wasatch Fault Zone, Utah. Models of Earthquake Recurrence. Case Study: Twelve Centuries of Earthquakes on the San Andreas Fault. Conditional Probabilities for Future Earthquakes. Earthquake Prediction. Earthquake-Hazard Reduction. Adjustments to Earthquake Activity. 9. Mountain Building. Introduction. Models of Landscape and Mountain Development. Dynamics of Orogenesis. Linkages in a Feedback-Rich Orogenic Systems. Landscape Evolution. Appendix A. Glossary. Index.
908 citations
TL;DR: In this paper, the effects of large organic debris on the fluvial processes and channel form may be very significant, depending on the size of the debris, size of stream, and many other factors, their effects range from insignificant to very important.
Abstract: \ SUMMARY Stream channel development in forested areas is profoundly influenced by large organic debris (logs, limbs and rootwads greater than 10 cm in diameter) in the channels. In low gradient meandering streams large organic debris enters the channel through bank erosion , mass wasting, blowdown, and collapse of trees due to ice loading. In small streams large organic debris may locally influence channel morphology and sediment transport processes because the stream may not have the competency to redistribute the debris. In larger streams flowing water may move large organic debris, concentrating it into distinct accumulations . (debris jams). Organic debris may greatly affect channel form and process by: increasing or decreasing stabilty of stream banks; influencing development of midchannel bars and short braided reaches; and faciltating, with other favourable circumstances, development of meander cutoffs. In steep gradient mountain streams organic debris may enter the channel by all the processes mentioned for low gradient streams. In addition, considerable debris may also enter the channel by way of debris avalanches or debris torrents. In small to intermediate size mountain streams with steep valley walls and little or no floodplain or flat valley floor, the effects of large organic debris on the fluvial processes and channel form may be very significant. Debris jams may locally accelerate or retard channel bed and bank erosion and/or deposition; create sites for significant sediment storage; and produce a stepped channel profile, herein referred to as ' organic stepping , which provides for variable channel morphology and flow conditions. The effed of live or dead trees anchored by rootwads into the stream bank may not only greatly retard bank erosion but also influence channel width and the development of small scour holes along the channel beneath tree roots. Once trees fall into the stream , their influence on the channel form and process may be quite different than when they were defending the banks , and, depending on thesize of the debris , size of the stream , and many other factors, their effects range from insignificant to very important.
819 citations
TL;DR: In this article, the authors present a new method for evaluating relative active tectonics based on geomorphic indices useful in evaluating morphology and topography, which are divided into four classes from relatively low to highest tectonic activity.
368 citations
Book•
13 Dec 1994
TL;DR: In this paper, the authors present a key themes in environmental science, including the Big Picture: Systems of Change, the Human Population and The Environment, Biological Diversity and Biological Invasions, Water Supply, Use and Management, Water Pollution and Treatment.
Abstract: Chapter 1 Key Themes in Environmental Science. Chapter 2 Science as a Way of Knowing: Critical Thinking about the Environment. Chapter 3 The Big Picture: Systems of Change. Chapter 4 The Human Population and The Environment. Chapter 5 Ecosystems: Concepts and Fundamentals. Chapter 6 The Biogeochemical Cycles. Chapter 7 Dollars and Environmental Sense: Economics of Environmental Issues. Chapter 8 Biological Diversity and Biological Invasions. Chapter 9 Ecological Restoration. Chapter 10 Environmental Heath, Pollution, and Toxicology. Chapter 11 Agriculture, Aquaculture, and the Environemnt. Chapter 12 Landscapes: Forests, Parks, and Wilderness. Chapter 13 Wildlife, Fisheries, and Endangered Species. Chapter 14 Energy: Some Basics. Chapter 15 Fossil Fuels and the Environment. Chapter 16 Alternative Energy and the Environment. Chapter 17 Nuclear Energy and the Environment. Chapter 18 Water Supply, Use, and Management. Chapter 19 Water Pollution and Treatment. Chapter 20 The Atmosphere, Climate, and Global Warming. Chapter 21 Air Pollution. Chapter 22 Urban Environments. Chapter 23 Materials Management. Chapter 24 Our Environmental Future. Appendix. Glossary. Notes. Photo Credits. Index.
295 citations
TL;DR: In this article, the authors carried out a geomorphic study by examining drainage patterns and characteristics of mountain fronts in order to reveal areal variations and styles of rock uplift, showing that the western part of the Sierra Nevada is tectonically active by means of a combination of normal faults along the mountain front and NNE-SSW oriented active folds, which, in turn, likely have a gravitational origin related to the exhumation of the footwall of the normal fault-system.
283 citations
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TL;DR: In this article, Naiman et al. pointed out that harnessing of streams and rivers comes at great cost: Many rivers no longer support socially valued native species or sustain healthy ecosystems that provide important goods and services.
Abstract: H umans have long been fascinated by the dynamism of free-flowing waters. Yet we have expended great effort to tame rivers for transportation, water supply, flood control, agriculture, and power generation. It is now recognized that harnessing of streams and rivers comes at great cost: Many rivers no longer support socially valued native species or sustain healthy ecosystems that provide important goods and services (Naiman et al. 1995, NRC 1992).
5,799 citations
TL;DR: In this article, the authors reviewed the rates at which coarse wood debris is added and removed from ecosystems, the biomass found in streams and forests, and many functions that CWD serves.
Abstract: Publisher Summary This chapter reviews the rates at which Coarse Woody Debris (CWD) is added and removed from ecosystems, the biomass found in streams and forests, and many functions that CWD serves. CWD is an important component of temperate stream and forest ecosystems and is added to the ecosystem by numerous mechanisms, including wind, fire, insect attack, pathogens, competition, and geomorphic processes. Many factors control the rate at which CWD decomposes, including temperature, moisture, the internal gas composition of CWD, substrate quality, the size of the CWD, and the types of organisms involved. The mass of CWD in an ecosystem ideally represents the balance between addition and loss. In reality, slow decomposition rates and erratic variations in input of CWD cause the CWD mass to deviate markedly from steady-state projections. Many differences correspond to forest type, with deciduous-dominated systems having generally lower biomass than conifer-dominated systems. Stream size also influences CWD mass in lotic ecosystems, while successional stage dramatically influences CWD mass in boat aquatic and terrestrial settings. This chapter reviews many of these functions and concludes that CWD is an important functional component of stream and forest ecosystems. Better scientific understanding of these functions and the natural factors influencing CWD dynamics should lead to more enlightened management practices.
3,247 citations
Proceedings Article•
16 May 2010TL;DR: An in-depth comparison of three measures of influence, using a large amount of data collected from Twitter, is presented, suggesting that topological measures such as indegree alone reveals very little about the influence of a user.
Abstract: Directed links in social media could represent anything from intimate friendships to common interests, or even a passion for breaking news or celebrity gossip. Such directed links determine the flow of information and hence indicate a user's influence on others — a concept that is crucial in sociology and viral marketing. In this paper, using a large amount of data collected from Twitter, we present an in-depth comparison of three measures of influence: indegree, retweets, and mentions. Based on these measures, we investigate the dynamics of user influence across topics and time. We make several interesting observations. First, popular users who have high indegree are not necessarily influential in terms of spawning retweets or mentions. Second, most influential users can hold significant influence over a variety of topics. Third, influence is not gained spontaneously or accidentally, but through concerted effort such as limiting tweets to a single topic. We believe that these findings provide new insights for viral marketing and suggest that topological measures such as indegree alone reveals very little about the influence of a user.
3,041 citations
TL;DR: Riparian zones possess an unusually diverse array of species and environmental processes as discussed by the authors, related to variable flood regimes, geographically unique channel processes, altitudinal climate shifts, and upland influences on the fluvial corridor.
Abstract: Riparian zones possess an unusually diverse array of species and environmental processes. The ecological diversity is related to variable flood regimes, geographically unique channel processes, altitudinal climate shifts, and upland influences on the fluvial corridor. The resulting dynamic environment supports a variety of life-history strategies, biogeochemical cycles and rates, and organisms adapted to disturbance regimes over broad spatial and temporal scales. Innovations in riparian zone management have been effective in ameliorating many ecological issues related to land use and environmental quality. Riparian zones play essential roles in water and landscape planning, in restoration of aquatic systems, and in catalyzing institutional and societal cooperation for these efforts.
2,502 citations
TL;DR: In this article, the authors present a frame-work for a hierarchical classification system, entailed an organized view of spatial and temporal variation among and within stream systems, which is useful for research involving establishment of monitoring stations, determination of local impacts of land-use practices, generalization from site-specific data, and assessment of basinwide, cumulative impacts of human activities on streams and their biota.
Abstract: Classification of streams and stream habitats is useful for research involving establishment of monitoring stations, determination of local impacts of land-use practices, generalization from site-specific data, and assessment of basin-wide, cumulative impacts of human activities on streams and their biota. This article presents a frame-work for a hierarchical classification system, entailing an organized view of spatial and temporal variation among and within stream systems. Stream habitat systems, defined and classified on several spatiotemporal scales, are associated with watershed geomorphic features and events. Variables selected for classification define relative long-term capacities of systems, not simply short-term states. Streams and their watershed environments are classified within the context of a regional biogeoclimatic landscape classification. The framework is a perspective that should allow more systematic interpretation and description of watershed-stream relationships.
2,242 citations