Hold the dates for these Distinguished Scholar seminars!
Manure Happens: The Consequences of Feeding Seven Billion Human Carnivores
Dr. Eric A. Davidson - University of Maryland Center for Environmental Science
Professor and Director, Appalachian Laboratory
Monday, March 7, 2016 3:00-4:00 209 Emerson Alumni Hall
Co-hosted with UF/IFAS Soil and Water Science Department
Humans have profoundly altered the global nitrogen (N) cycle in an effort to feed 7 billion people. Food and energy production from agriculture, combined with industrial and energy sources, have more than doubled the amount of reactive nitrogen circulating annually on land. Humanity has disrupted the nitrogen cycle even more than the carbon (C) cycle, leading to widespread effects on ecosystems, biodiversity, human health, and climate. There have been important successes in reducing nitrogen emissions to the atmosphere by industrial and transportation sectors, and this has improved air quality. Effective solutions for reducing nitrogen losses from agriculture to groundwater and surface waters have also been identified, although political and economic impediments to their adoption remain.
Fluid Induced Earthquakes: Insights from Hydrogeology and Poro-mechanics
Dr. Shemin Ge - 2016 Birdsall-Dreiss Distinguished Lecturer, Geological Society of America
University of Colorado-Boulder, Professor of Hydrogeology, Department of Geological Sciences
Thursday, March 24, 2016 (time and location to be determined)
Co-hosted with Department of Geological Sciences
Beginning in the 1960s, pore fluid pressure was identified as the primary culprit for inducing earthquakes reported near deep fluid-injection wells and newly built surface reservoirs worldwide. As these human activities continue and grow, induced seismicity has surged in recent decades at some but not all sites. This increase in seismicity raises the question of what fundamental hydrogeologic and poro-mechanics processes and parameters make some sites more prone to induced seismicity. This lecture will offer an overview and physical insights of fluid induced seismicity from hydrologic and poro-mechanics perspectives. Two contrasting case studies are used to illustrate how pore fluid pressure could have played a role in observed seismicity, one near a deep well fluid injection in the geologically quiescent region in the central US, and the other near a surface reservoir in a tectonically active region. High rate of fluid input emerges as an important player in contributing to induced seismicity. The first few years of fluid injection or reservoir impoundment is typically a critical period when seismic hazard is elevated. While pre-existing faults dictate earthquake locations, the spatial extent of pore pressure influence could reach tens of kilometres from fluid injection or reservoir impoundment sites. Continued research in this direction will not only offer a better understanding of the hydrogeologic and seismologic processes but also help to guide best practices in the quest for water and energy resources in coming decades.
Carol Lippincott, Ph.D.
University of Florida Water Institute
1949 Stadium Rd. 570 Weil Hall 352-294-7744
Mail: PO Box 116601 [log in to unmask]
Gainesville, FL 32611-6601 www.waterinstitute.ufl.edu