Seismic imaging of deep low-velocity zone beneath the Dead Sea basin and transform fault: Implications for strain localization and crustal rigidity
Uri S. ten Brink, A. S. Al-Zoubi, C.H. Flores, Y. Rotstein, I. Qabbani, S.H. Harder, Gordon R. Keller
2006, Geophysical Research Letters (33)
New seismic observations from the Dead Sea basin (DSB), a large pull-apart basin along the Dead Sea transform (DST) plate boundary, show a low velocity zone extending to a depth of 18 km under the basin. The lower crust and Moho are not perturbed. These observations are incompatible with the...
Slip on the San Andreas fault at Parkfield, California, over two earthquake cycles, and the implications for seismic hazard
J. Murray, J. Langbein
2006, Bulletin of the Seismological Society of America (96)
Parkfield, California, which experienced M 6.0 earthquakes in 1934, 1966, and 2004, is one of the few locales for which geodetic observations span multiple earthquake cycles. We undertake a comprehensive study of deformation over the most recent earthquake cycle and explore the results in the context of geodetic data collected...
Grenvillian magmatism in the northern Virginia Blue Ridge: Petrologic implications of episodic granitic magma production and the significance of postorogenic A-type charnockite
R.P. Tollo, J. N. Aleinikoff, E.A. Borduas, A.P. Dickin, R.H. McNutt, C.M. Fanning
2006, Precambrian Research (151) 224-264
Grenvillian (1.2 to 1.0 Ga) plutonic rocks in northern Virginia preserve evidence of episodic, mostly granitic magmatism that spanned more than 150 million years (m.y.) of crustal reworking. Crystallization ages determined by sensitive high resolution ion microprobe (SHRIMP) U-Pb isotopic analyses of zircon and monazite, combined with results from previous...
Combined time-series resistivity and geochemical tracer techniques to examine submarine groundwater discharge at Dor Beach, Israel
P.W. Swarzenski, W. C. Burnett, W.J. Greenwood, B. Herut, R. Peterson, N. Dimova, Y. Shalem, Y. Yechieli, Y. Weinstein
2006, Geophysical Research Letters (33)
A high-resolution, stationary geophysical and geochemical survey was conducted at Dor Beach, Israel, to examine the shallow coastal hydrogeology and its control on the exchange of submarine groundwater with the shallow Mediterranean Sea. Time-series resistivity profiles using a new 56 electrode (112-m long) marine cable produced detailed profiles of the...
Testing the concept of drift shadow at Yucca Mountain, Nevada
J.B. Paces, L.A. Neymark, T. Ghezzehei, P.F. Dobson
2006, Conference Paper, Proceedings of the 11th International High Level Radioactive Waste Management Conference, IHLRWM
If proven, the concept of drift shadow, a zone of reduced water content and slower ground-water travel time beneath openings in fractured rock of the unsaturated zone, may increase performance of a proposed geologic repository for high-level radioactive waste at Yucca Mountain, To test this concept under natural-flow conditions present...
Characterization of unsaturated zone hydrogeologic units using matrix properties and depositional history in a complex volcanic environment
Lorraine E. Flint, David C. Buesch, Alan L. Flint
2006, Vadose Zone Journal (5) 480-492
Characterization of the physical and unsaturated hydrologic properties of subsurface materials is necessary to calculate flow and transport for land use practices and to evaluate subsurface processes such as perched water or lateral diversion of water, which are influenced by features such as faults, fractures, and abrupt changes in lithology....
Biomarkers of exposure and effects of environmental contaminants on swallows nesting along the Rio Grande, Texas, USA
M.A. Mora, D. Musquiz, J. W. Bickham, D.S. MacKenzie, M.J. Hooper, J.K. Szabo, C. W. Matson
2006, Environmental Toxicology and Chemistry (25) 1574-1584
We collected adult cave swallows (Petrochelidon fulva) and cliff swallows (P. pyrrhonota) during the breeding seasons in 1999 and 2000 from eight locations along the Rio Grande from Brownsville to El Paso (unless otherwise specified, all locations are Texas, USA) and an out-of-basin reference location. Body mass, spleen mass, hepatosomatic...
Integration of P- and SH-wave high-resolution seismic reflection and micro-gravity techniques to improve interpretation of shallow subsurface structure: New Madrid seismic zone
C.E. Bexfield, J.H. McBride, Andre J. M. Pugin, D. Ravat, S. Biswas, W.J. Nelson, T.H. Larson, S.L. Sargent, M.A. Fillerup, B.E. Tingey, L. Wald, M.L. Northcott, J.V. South, M.S. Okure, M.R. Chandler
2006, Tectonophysics (420) 5-21
Shallow high-resolution seismic reflection surveys have traditionally been restricted to either compressional (P) or horizontally polarized shear (SH) waves in order to produce 2-D images of subsurface structure. The northernmost Mississippi embayment and coincident New Madrid seismic zone (NMSZ) provide an ideal laboratory to study the experimental use of integrating...
A stochastic estimate of ground motion at Oceano, California, for the M 6.5 22 December 2003 San Simeon earthquake, derived from aftershock recordings
Alessandro C. Di, J. Boatwright
2006, Bulletin of the Seismological Society of America (96) 1437-1447
The U.S. Geological Survey deployed a digital seismic station in Oceano, California, in February 2004, to investigate the cause of damage and liquefaction from the 22 December 2003 M 6.5 San Simeon earthquake. This station recorded 11 M > 2.8 aftershocks in almost 8 weeks. We analyze these recordings, together...
Prediction failure of a wolf landscape model
L.D. Mech
2006, Wildlife Society Bulletin (34) 874-877
I compared 101 wolf (Canis lupus) pack territories formed in Wisconsin during 1993-2004 to the logistic regression predictive model of Mladenoff et al. (1995, 1997, 1999). Of these, 60% were located in putative habitat suitabilities <50%, including 22% in suitabilities of 0-9%. About a third of the area with putative...
Development of standardized lunar regolith simulant materials
P. Carpenter, L. Sibille, S. Wilson, G. Meeker
2006, Conference Paper, Microscopy and Microanalysis
[No abstract available]...
Feasibility of an implantable capsule for limiting lifespan of grass carp
R.M. Thomas, L.E. Miranda, J.P. Kirk
2006, Journal of Aquatic Plant Management (44) 80-89
The grass carp (Ctenopharyngodon idella) is an herbivorous cyprinid stocked to control undesirable aquatic vegetation. However, stocking grass carp presents several problems including complete eradication of submersed aquatic vegetation, dispersal out of the target area, adverse effects on fish communities, and damage to waterfowl habitat and native vegetation. The purpose...
Macroinvertebrate assemblage recovery following a catastrophic flood and debris flows in an Appalachian mountain stream
C.D. Snyder, Z.B. Johnson
2006, Journal of the North American Benthological Society (25) 825-840
In June 1995, heavy rains caused severe flooding and massive debris flows on the Staunton River, a 3rd-order stream in the Blue Ridge Mountains (Virginia, USA). Scouring caused the loss of the riparian zone and repositioned the stream channel of the lower 2.1 km of the stream. Between 1998 and...
Urine-marking and ground-scratching by free-ranging Arctic Wolves, Canis lupus arctos, in summer
L.D. Mech
2006, Canadian Field-Naturalist (120) 466-470
Urine-marking and ground-scratching were observed in an Arctic Wolf (Canis lupus) pack on Ellesmere Island, Nunavut, Canada, during 16 summers between 1986 and 2005. All previously known urination postures and ground-scratching by breeding males and females were seen, and incidence of marking and scratching was greatest when non-pack wolves were...
Flow and form in rehabilitation of large-river ecosystems: an example from the Lower Missouri River
R. B. Jacobson, D.L. Galat
2006, Geomorphology (77) 249-269
On large, intensively engineered rivers like the Lower Missouri, the template of the physical habitat is determined by the nearly independent interaction of channel form and flow regime. We evaluated the interaction between flow and form by modeling four combinations of modern and historical channel form and modern and historical...
National large-scale urban true orthophoto mapping and its standard initiative
G. Zhou, W. Xie, S. Benjamin, R.G. Fegeas, J. Simmers, H. Cluff, Y. Lei, J. Foust
2006, Conference Paper, ACM International Conference Proceeding Series
[No abstract available]...
Biogeochemical transport in the Loxahatchee River estuary, Florida: The role of submarine groundwater discharge
P.W. Swarzenski, W. H. Orem, B. F. McPherson, M. Baskaran, Y. Wan
2006, Marine Chemistry (101) 248-265
The distributions of dissolved organic carbon (DOC), Ba, U, and a suite of naturally occurring radionuclides in the U/Th decay series (222Rn, 223,224,226,228Ra) were studied during high- and low-discharge conditions in the Loxahatchee River estuary, Florida to examine the role of submarine groundwater discharge in estuarine transport. The fresh water...
Effect of thermal maturation on the K-Ar, Rb-Sr and REE systematics of an organic-rich New Albany Shale as determined by hydrous pyrolysis
Norbert Clauer, Sambhudas Chaudhuri, M. D. Lewan, T. Toulkeridis
2006, Chemical Geology (234) 169-177
Hydrous-pyrolysis experiments were conducted on an organic-rich Devonian-Mississippian shale, which was also leached by dilute HCl before and after pyrolysis, to identify and quantify the induced chemical and isotopic changes in the rock. The experiments significantly affect the organic-mineral organization, which plays an important role in natural interactions during diagenetic...
Effects of feral horses in Great Basin landscapes on soils and ants: Direct and indirect mechanisms
E.A. Beever, J. E. Herrick
2006, Journal of Arid Environments (66) 96-112
We compared soil-surface penetration resistance and abundance of ant mounds at 12 western Great Basin sites (composed of 19 plots) either grazed by feral horses (Equus caballus) or having had horses removed for the last 10–14 years. Across this broad spatial domain (3.03 million ha), we minimized confounding due to abiotic...
Possible effects of the 2004 and 2005 hurricanes on manatee survival rates and movement
C.A. Langtimm, M. D. Krohn, J.P. Reid, B.M. Stith, C.A. Beck
2006, Estuaries and Coasts (29) 1026-1032
Prior research on manatee (Trichechus manatus latirostris) survival in northwest Florida, based on mark-resighting photo-identification data from 1982-1998, showed that annual adult apparent survival rate was significantly lower during years with extreme storms. Mechanisms that we proposed could have led to lower estimates included stranding, injury from debris, being fatally...
Helping Students make the transition from novice learner of ground-water concepts to expert using the Plume Busters software
P. A. Macfarlane, G. Bohling, K.W. Thompson, M. Townsend
2006, Journal of Geoscience Education (54) 610-619
Environmental and earth science students are novice learners and lack the experience needed to rise to the level of expert. To address this problem we have developed the prototype Plume Busters?? software as a capstone educational experience, in which students take on the role of an environmental consultant. Following a...
Sizing up oil on Alaska's North Slope
K. J. Bird, D.W. Houseknecht
2006, Geotimes (51) 24-27
[No abstract available]...
The heartbeat of the volcano: The discovery of episodic activity at Prometheus on Io
Ashley G. Davies, Lionel Wilson, Dennis Matson, Giovanni Leone, Laszlo P. Keszthelyi, Windy L. Jaeger
2006, Icarus (184) 460-477
The temporal signature of thermal emission from a volcano is a valuable clue to the processes taking place both at and beneath the surface. The Galileo Near Infrared Mapping Spectrometer (NIMS) observed the volcano Prometheus, on the jovian moon Io, on multiple occasions between 1996 and 2002. The 5 micron (μm) brightness of this volcano shows...
Confirmation of a meteoritic component in impact-melt rocks of the Chesapeake Bay impact structure, Virginia, USA - Evidence from osmium isotopic and PGE systematics
S.R. Lee, J. Wright Horton Jr., R.J. Walker
2006, Meteoritics and Planetary Science (41) 819-833
The osmium isotope ratios and platinum-group element (PGE) concentrations of impact-melt rocks in the Chesapeake Bay impact structure were determined. The impact-melt rocks come from the cored part of a lower-crater section of suevitic crystalline-clast breccia in an 823 m scientific test hole over the central uplift at Cape Charles,...
Mapping of Titan: Results from the first Titan radar passes
E. R. Stofan, J. I. Lunine, R. Lopes, F. Paganelli, R. D. Lorenz, C. A. Wood, Randolph L. Kirk, S. Wall, C. Elachi, Laurence A. Soderblom, S. Ostro, M. Janssen, J. Radebaugh, L. Wye, H. Zebker, Y. Anderson, M. Allison, R. Boehmer, P. Callahan, P. Encrenaz, E. Flamini, G. Francescetti, Y. Gim, G. Hamilton, S. Hensley, W.T.K. Johnson, K. Kelleher, D. Muhleman, G. Picardi, F. Posa, L. Roth, R. Seu, S. Shaffer, B. Stiles, S. Vetrella, R. West
2006, Icarus (185) 443-456
The first two swaths collected by Cassini's Titan Radar Mapper were obtained in October of 2004 (Ta) and February of 2005 (T3). The Ta swath provides evidence for cryovolcanic processes, the possible occurrence of fluvial channels and lakes, and some tectonic activity. The T3 swath has extensive areas of dunes...
