A5058626771- earthquake and tectonic studies
- Rock Mechanics and Modeling
- Isotope Analysis in Ecology
- Marine and fisheries research
- Seismic Imaging and Inversion Techniques
- Marine Bivalve and Aquaculture Studies
- Geotechnical and Geomechanical Engineering
- Geological and Geochemical Analysis
- Landslides and related hazards
- Drilling and Well Engineering
- Seismic Waves and Analysis
- High-pressure geophysics and materials
- Marine animal studies overview
- Hydraulic Fracturing and Reservoir Analysis
- Fish Ecology and Management Studies
- Tunneling and Rock Mechanics
- Coastal wetland ecosystem dynamics
- Coastal and Marine Dynamics
- Geophysical Methods and Applications
- Geophysical and Geoelectrical Methods
- Building materials and conservation
- Geochemistry and Geologic Mapping
- Seismology and Earthquake Studies
- Marine and coastal plant biology
- Groundwater flow and contamination studies
Massachusetts Maritime Academy
2013-2024
University of New Hampshire at Manchester
2005-2014
University of New Hampshire
2008-2014
Government of British Columbia
2014
University of Oregon
2005-2013
Texas A&M University
1987-2011
Collecte Localisation Satellites (France)
2010
Fisheries and Oceans Canada
2010
Marine Biological Laboratory
2005-2008
Geological Survey of Canada
2006
1. Lipids have more negative delta(13)C values relative to other major biochemical compounds in plant and animal tissues. Although variable lipid content biological tissues alters results conclusions of analyses aquatic food web migration studies, no standard correction protocol exists. 2. We compared chemical extraction mathematical methods for freshwater marine fishes invertebrates better understand impacts approaches on carbon (delta(13)C) nitrogen (delta(15)N) stable isotope data. 3....
Movements of Atlantic bluefin tuna ( Thunnus thynnus , ABFT) from specific western forage grounds are not well described, and the extent their spawning areas is mainly surmised. In 2005 2006, we deployed 41 pop-up satellite archival tags (PSATs) on adult off coast Nova Scotia, Canada, Georges Bank. During assumed period, 56% tagged ABFT occupied a known area, while 44% were located in distant oceanic regions. Assuming obligate annual spawning, these results inconsistent with notion site...
Abstract Stable isotope ratios act as chemical tracers of animal diet, and are used to study food web dynamics. Because carbon stable values influenced by tissue lipid content, a number extraction methods have been remove bias, but, in some species tissues, extractions also alter nitrogen values. We analyzed δ 13 C 15 N Atlantic bluefin tuna liver white muscle, whole herring, fish tissues covering wide range content (bulk C:N 3.1–12.5). In order compare from traditional chloroform/methanol...
Abstract Transmissibility (T) may be estimated from the results of routine pumping tests water wells when only discharge (Q), drawdown (s) and aquifer thickness (m) are known:
Research Article| June 01, 2014 Tectonic Controls on Early Mesozoic Paired Alkaline Porphyry Deposit Belts (Cu-Au ± Ag-Pt-Pd-Mo) Within the Canadian Cordillera James M. Logan; Logan † BC Ministry of Energy and Mines, P.O. Box 9333, Stn Prov Govt, Victoria, V8W 9N3, Canada †Corresponding author: e-mail, Jim.Logan@gov.bc.ca Search for other works by this author on: GSW Google Scholar Mitchell G. Mihalynuk Economic Geology (2014) 109 (4): 827–858. https://doi.org/10.2113/econgeo.109.4.827...
Research Article| June 01, 1974 Glass-Indurated Quartz Gouge in Sliding-Friction Experiments on Sandstone M. FRIEDMAN; FRIEDMAN 1Center for Tectonophysics, Texas A&M University, College Station, 77843 Search other works by this author on: GSW Google Scholar J. LOGAN; LOGAN A. RIGERT GSA Bulletin (1974) 85 (6): 937–942. https://doi.org/10.1130/0016-7606(1974)85<937:GQGISE>2.0.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation Add to Manager Share Icon MailTo Twitter...
Considerable uncertainty remains over how increasing atmospheric CO2 and anthropogenic climate changes are affecting open-ocean marine ecosystems from phytoplankton to top predators. Biological time series data thus urgently needed for the world's oceans. Here, we use carbon stable isotope composition of tuna provide a first insight into existence global trends in complex ecosystem dynamics oceanic cycle. From 2000 2015, considerable declines δ13 C values 0.8‰-2.5‰ were observed across three...
Abstract Aim We examined potential environmental drivers of broad‐scale spatial patterns in the trophic structure marine ecosystems as represented by nitrogen stable isotopes globally distributed predators. Additionally, we assessed effects scale on predictive capabilities variables. Location Global oceans. Time period 2000 to 2015. Major taxa studied Tunas: Thunnus albacares , obesus alalunga . Methods undertook a global compilation and meta‐analysis bulk isotope ratios (δ 15 N values)...
Most monitoring programs next to large per- and polyfluoroalkyl substances (PFAS) sources focus on drinking water contamination near source zones. However, less is understood about how these affect downgradient hydrological systems food webs. Here, we report paired PFAS measurements in water, sediment, aquatic biota along a gradient away from zones contaminated by the use of legacy aqueous film-forming foam (AFFF) manufactured using electrochemical fluorination. Clustering analysis indicates...
Research Article| August 01, 1991 Influence of layering and boundary conditions on fault-bend fault-propagation folding JUDITH S. CHESTER; CHESTER 1Center for Tectonophysics Department Geology, Texas A&M University, College Station, 77843 Search other works by this author on: GSW Google Scholar JOHN M. LOGAN; LOGAN H. SPANG GSA Bulletin (1991) 103 (8): 1059–1072. https://doi.org/10.1130/0016-7606(1991)103<1059:IOLABC>2.3.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation...
Stick‐slip has been considered to be a mechanism of shallow focus earthquakes along pre‐existing faults, and thus laboratory studies relevant stick‐slip may lead better understanding the mechanisms eventually an effective prediction and/or control them. This paper deals with effects various simulated gouges on sliding behavior rocks special emphasis how fault gouge alters potentially unstable brittle rock. About 150 specimens Tennessee sandstone 35° precut are deformed dry in triaxial...