Wrightwood and the earthquake cycle: What a long recurrence record tells us about how faults work
R. Weldon, K. Scharer, T. Fumal, G. Biasi
2004, GSA Today (14) 4-10
The concept of the earthquake cycle is so well established that one often hears statements in the popular media like, "the Big One is overdue" and "the longer it waits, the bigger it will be." Surprisingly, data to critically test the variability in recurrence intervals, rupture displacements, and relationships between...
Encounter history modeling of joint mark-recapture, tag-resighting and tag-recovery data under temporary emigration
R. J. Barker, K.P. Burnham, Gary C. White
2004, Statistica Sinica (14) 1037-1055
We describe a joint analysis of mark-recapture, tag-resight and tag-recovery data that directly models the encounter history of an animal. The probability of the encounter history for each animal is partitioned into survival, recapture, resighting, and recovery components, and a component for the probability that the animal is never encountered...
Estimation of runoff and sediment yield in the Redrock Creek watershed using AnnAGNPS and GIS
Ming-shu Tsou, X.-Y. Zhan
2004, Journal of Environmental Sciences (16) 865-867
Sediment has been identified as a significant threat to water quality and channel clogging that in turn may lead to river flooding. With the increasing awareness of the impairment from sediment to water bodies in a watershed, identifying the locations of the major sediment sources and reducing the sediment through...
Ad Duwayhi, Saudi Arabia: Geology and geochronology of a neoproterozoic intrusion-related gold system in the Arabian shield
Jeff L. Doebrich, S.G. Zahony, J.D. Leavitt, J.S. Portacio Jr., A.A. Siddiqui, Joseph L. Wooden, Robert J. Fleck, Holly J. Stein
2004, Economic Geology (99) 713-741
The Ad Duwayhi gold deposit, located in the east-central part of the Arabian shield, is the newest gold discovery in Saudi Arabia. Exploration to date has identified a gold resource of greater than 1 million ounces (oz) with significant potential for expansion. Gold mineralization was closely associated, in time...
Sustaining salmonid populations: A caring understanding of naturalness of taxa
Jennifer L. Nielsen, Henry A. Regier
E. Eric Knudsen, editor(s)
2004, Conference Paper, Sustainable management of North American fisheries: American Fisheries Society Symposium 43
Species of the family of Salmonidae occur naturally in Northern Hemisphere waters that remain clear and cool to cold in summer. For purposes of reproduction, salmonids generally behaviorally respond to the currents of streams and lakes in recently glaciated areas. For feeding and maturation, many larger species migrate into existing...
Annual survival estimation of migratory songbirds confounded by incomplete breeding site-fidelity: Study designs that may help
M.R. Marshall, Duane R. Diefenbach, L.A. Wood, R.J. Cooper
2004, Animal Biodiversity and Conservation (27) 59-72
Many species of bird exhibit varying degrees of site-fidelity to the previous year's territory or breeding area, a phenomenon we refer to as incomplete breeding site-fidelity. If the territory they occupy is located beyond the bounds of the study area or search area (i.e., they have emigrated from the study...
Assessing rarity of species with low detectability: Lichens in Pacific Northwest forests
T.C. Edwards Jr., D.R. Cutler, L. Geiser, J. Alegria, D. McKenzie
2004, Ecological Applications (14) 414-424
We show how simple statistical analyses of systematically collected inventory data can be used to provide reliable information about the distribution and habitat associations of rare species. Using an existing design-based sampling grid on which epiphytic macrolichens had been inventoried in the Northwest Forest Plan area of the U.S. Pacific...
Pyroclastic flow hazard at Volcán Citlaltépetl
Michael F. Sheridan, Bernard E. Hubbard, Gerardo Carrasco-Nunez, Claus Siebe
2004, Natural Hazards (33) 209-221
Volcán Citlaltépetl (Pico de Orizaba) with an elevation of 5,675 m is the highest volcano in North America. Its most recent catastrophic events involved the production of pyroclastic flows that erupted approximately 4,000, 8,500, and 13,000 years ago. The distribution of mapped deposits from these eruptions gives an approximate guide...
Field investigation into unsaturated flow and transport in a fault: Model analyses
H.-H. Liu, R. Salve, J.-S. Wang, G.S. Bodvarsson, D. Hudson
2004, Journal of Contaminant Hydrology (74) 39-59
Results of a fault test performed in the unsaturated zone of Yucca Mountain, Nevada, were analyzed using a three-dimensional numerical model. The fault was explicitly represented as a discrete feature and the surrounding rock was treated as a dual-continuum (fracture-matrix) system. Model calibration against seepage and water-travel-velocity data suggests that...
The nucleus of Comet Borrelly: A study of morphology and surface brightness
J. Oberst, Elpitha Howington-Kraus, Randolph L. Kirk, Laurence A. Soderblom, B. Buratti, M. Hicks, R. Nelson, D. Britt
2004, Icarus (167) 70-79
Stereo images obtained during the DS1 flyby were analyzed to derive a topographic model for the nucleus of Comet 19P/Borrelly for morphologic and photometric studies. The elongated nucleus has an overall concave shape, resembling a peanut, with the lower end tilted towards the camera. The bimodal character of surface-slopes and...
Dome growth behavior at Soufriere Hills Volcano, Montserrat, revealed by relocation of volcanic event swarms, 1995-1996
C.A. Rowe, C.H. Thurber, R.A. White
2004, Journal of Volcanology and Geothermal Research (134) 199-221
We have relocated a subset of events from the digital waveform catalogue of ???17,000 volcanic microearthquakes recorded between July 1995 and February 1996 at Soufriere Hills Volcano (SHV), Montserrat, using a cross-correlation-based phase repicking technique with a joint location method. Hypocenters were estimated for 3914 earthquakes having five or more...
Habitat disturbance and the diversity and abundance of ants (Formicidae) in the Southeastern Fall-Line Sandhills
J.H. Graham, H.H. Hughie, S. Jones, K. Wrinn, A.J. Krzysik, J.J. Duda, D. Carl Freeman, J.M. Emlen, J.C. Zak, D.A. Kovacic, C. Chamberlin-Graham, H. Balbach
2004, Journal of Insect Science (4) 1-15
We examined habitat disturbance, species richness, equitability, and abundance of ants in the Fall-Line Sandhills, at Fort Benning, Georgia. We collected ants with pitfall traps, sweep nets, and by searching tree trunks. Disturbed areas were used for military training; tracked and wheeled vehicles damaged vegetation and soils. Highly disturbed sites...
Revisiting the 23 February 1892 Laguna Salada earthquake
S. E. Hough, A. Elliot
2004, Bulletin of the Seismological Society of America (94) 1571-1578
According to some compilations, the Laguna Salada, Baja California, earthquake of 23 February 1892 ranks among the largest earthquakes in California and Baja California in historic times. Although surface rupture was not documented at the time of the earthquake, recent geologic investigations have identified and mapped a rupture on the...
Landslides triggered by the 2002 Denali fault, Alaska, earthquake and the inferred nature of the strong shaking
R.W. Jibson, E. L. Harp, W. Schulz, D. K. Keefer
2004, Earthquake Spectra (20) 669-691
The 2002 M7.9 Denali fault, Alaska, earthquake triggered thousands of landslides, primarily rock falls and rock slides, that ranged in volume from rock falls of a few cubic meters to rock avalanches having volumes as great as 15 ?? 106 m3. The pattern of landsliding was unusual; the number of...
Multi-stage origin of the Coast Range ophiolite, California: Implications for the life cycle of supra-subduction zone ophiolites
J.W. Shervais, D.L. Kimbrough, P. Renne, B.B. Hanan, B. Murchey, C.A. Snow, Schuman Zoglman, J. Beaman
2004, International Geology Review (46) 289-315
The Coast Range ophiolite of California is one of the most extensive ophiolite terranes in North America, extending over 700 km from the northernmost Sacramento Valley to the southern Transverse Ranges in central California. This ophiolite, and other ophiolite remnants with similar mid-Jurassic ages, represent a major but short-lived episode...
Direct-push geochemical profiling for assessment of inorganic chemical heterogeneity in aquifers
M.K. Schulmeister, J.M. Healey, J.J. Butler Jr., G.W. McCall
2004, Journal of Contaminant Hydrology (69) 215-232
Discrete-depth sampling of inorganic groundwater chemistry is essential for a variety of site characterization activities. Although the mobility and rapid sampling capabilities of direct-push techniques have led to their widespread use for evaluating the distribution of organic contaminants, complementary methods for the characterization of spatial variations in geochemical conditions have...
The effectiveness of a barrier wall and underpasses in reducing wildlife mortality on a heavily traveled highway in Florida
C.K. Dodd Jr., W.J. Barichivich, L. L. Smith
2004, Biological Conservation (118) 619-631
Because of high numbers of animals killed on Paynes Prairie State Preserve, Alachua County, Florida, the Florida Department of Transportation constructed a barrier wall-culvert system to reduce wildlife mortality yet allow for passage of some animals across the highway. During a one year study following construction, we counted only 158...
Estimating tectonic history through basin simulation-enhanced seismic inversion: Geoinformatics for sedimentary basins
K. Tandon, K. Tuncay, K. Hubbard, J. Comer, P. Ortoleva
2004, Geophysical Journal International (156) 129-139
A data assimilation approach is demonstrated whereby seismic inversion is both automated and enhanced using a comprehensive numerical sedimentary basin simulator to study the physics and chemistry of sedimentary basin processes in response to geothermal gradient in much greater detail than previously attempted. The approach not only reduces costs by...
Littoral Assessment of Mine Burial Signatures (LAMBS) buried land mine/background spectral signature analyses
A.C. Kenton, D.M. Geci, K.J. Ray, C.M. Thomas, J.W. Salisbury, J.C. Mars, J.K. Crowley, N.H. Witherspoon, J.H. Holloway Jr.
J.H. Harmon R.S.Broach J.T.Holloway, editor(s)
2004, Conference Paper, Proceedings of SPIE - The International Society for Optical Engineering
The objective of the Office of Naval Research (ONR) Rapid Overt Reconnaissance (ROR) program and the Airborne Littoral Reconnaissance Technologies (ALRT) project's LAMBS effort is to determine if electro-optical spectral discriminants exist that are useful for the detection of land mines in littoral regions. Statistically significant buried mine overburden and...
Assessing the potential for fish predation to impact zebra mussels (Dreissena polymorpha): Insight from bioenergetics models
M.A. Eggleton, L.E. Miranda, J.P. Kirk
2004, Ecology of Freshwater Fish (13) 85-95
Rates of annual food consumption and biomass were modeled for several fish species across representative rivers and lakes in eastern North America. Results were combined to assess the relative potential of fish predation to impact zebra mussels (Dreissena polymorpha). Predicted annual food consumption by fishes in southern waters was over...
Ancient wet aeolian environments on Earth: Clues to presence of fossil/live microorganisms on Mars
W.C. Mahaney, M.W. Milner, D. I. Netoff, D. Malloch, J. M. Dohm, V.R. Baker, H. Miyamoto, T.M. Hare, G. Komatsu
2004, Icarus (171) 39-53
Ancient wet aeolian (wet-sabkha) environments on Earth, represented in the Entrada and Navajo sandstones of Utah, contain pipe structures considered to be the product of gas/water release under pressure. The sediments originally had considerable porosity allowing the ingress of living plant structures, microorganisms, clay minerals, and fine-grained primary minerals of...
The effect of fire on mercury cycling in the soils of forested watersheds: Acadia National Park, Maine, U.S.A
A. Amirbahman, P.L. Ruck, I.J. Fernandez, T.A. Haines, J. S. Kahl
2004, Water, Air, & Soil Pollution (152) 313-331
This study compares mercury (Hg) and methylmercury (MeHg) distribution in the soils of two forested stream watersheds at Acadia National Park, Maine, U.S.A. Cadillac Brook watershed, which burned in 1947, has thin soils and predominantly deciduous vegetation. It was compared to the unburned Hadlock Brook watershed, with thicker soil and...
Effects of natal departure and water level on survival of juvenile snail kites (Rostrhamus sociabilis) in Florida
V.J. Dreitz, W.M. Kitchens, D.L. DeAngelis
2004, The Auk (121) 894-903
Survival rate from fledging to breeding, or juvenile survival, is an important source of variation in lifetime reproductive success in birds. Therefore, determining the relationship between juvenile survival and environmental factors is essential to understanding fitness consequences of reproduction in many populations. With increases in density of individuals and depletion...
Radon (222Rn) in ground water of fractured rocks: A diffusion/ion exchange model
W.W. Wood, T. F. Kraemer, A. Shapiro
2004, Ground Water (42) 552-567
Ground waters from fractured igneous and high‐grade sialic metamorphic rocks frequently have elevated activity of dissolved radon (222Rn). A chemically based model is proposed whereby radium (226Ra) from the decay of uranium (238U) diffuses through the primary porosity of the rock to the water‐transmitting fracture where...
Mineralogical and geochemical controls on the release of trace elements from slag produced by base- and precious-metal smelting at abandoned mine sites
N.M. Piatak, R.R. Seal II, J. M. Hammarstrom
2004, Conference Paper, Applied Geochemistry
Slag collected from smelter sites associated with historic base-metal mines contains elevated concentrations of trace elements such as Cu, Zn and Pb. Weathering of slag piles, many of which were deposited along stream banks, potentially may release these trace elements into the environment. Slags were sampled from the Ely and...
