A5042026351- Geological and Geochemical Analysis
- earthquake and tectonic studies
- High-pressure geophysics and materials
- Seismic Waves and Analysis
- Seismic Imaging and Inversion Techniques
- Geochemistry and Geologic Mapping
- Geology and Paleoclimatology Research
- Seismology and Earthquake Studies
- Geological and Tectonic Studies in Latin America
- Cognitive Abilities and Testing
- School Choice and Performance
- Educational and Psychological Assessments
- Behavioral and Psychological Studies
- Psychometric Methodologies and Testing
- Geophysical and Geoelectrical Methods
- Geomagnetism and Paleomagnetism Studies
- Geological formations and processes
- Topic Modeling
- Underwater Acoustics Research
- Higher Education Research Studies
- Hydrocarbon exploration and reservoir analysis
- Education Systems and Policy
- Underwater Vehicles and Communication Systems
- Geological and Geophysical Studies
- Attention Deficit Hyperactivity Disorder
Johns Hopkins University
2024
Johns Hopkins Medicine
2024
University of Colorado Boulder
2010-2023
Cooperative Institute for Research in Environmental Sciences
2009-2023
University of Colorado System
2020-2023
University of Birmingham
2019
Arkansas State University
1984-2008
University of Aberdeen
1994-2002
University of West Florida
1994-1997
University of Nevada, Reno
1992
▪ Abstract Cenozoic extension in the western United States presents a complex interrelation of extension, volcanism, and plate boundary tectonics that defeats simple notions “active” or “passive” rifting. Forces driving can originate at boundaries, through basal traction, normal forces, from buoyancy forces internal to crust lithospheric mantle. The latter two are most responsible for where it is observed Basin Range. evolution northern Range probably represents removal alteration mantle...
Active and passive seismic experiments show that the southern Sierra, despite standing 1.8 to 2.8 kilometers above its surroundings, is underlain by crust of similar thickness, about 30 40 kilometers. Thermobarometry xenolith suites magnetotelluric profiles indicate upper mantle eclogitic depths 60 beneath western central parts range, but little subcrustal lithosphere present eastern High Sierra adjacent Basin Range. These other data imply both Range thinned a factor 2 since 20 million years...
Abstract Dynamic topography is commonly understood to be deflection of the Earth's surface that results from convection mantle. Because different authors use words “dynamic topography” differently, designated as dynamic may amount only a few hundred meters or exceed 2000 m. For most regions, however, heights computed on assumption lithospheric column in isostatic equilibrium provide good approximations observed topography. The small free‐air gravity anomalies and still smaller (<~30–50...
Variations in crustal thickness from the Great Plains of Kansas, across Colorado Rocky Mountains, and into eastern Plateau are determined by receiver function analysis broadband teleseismic P waveforms recorded during 1992 Mountain Front Program for Array Seismic Studies Continental Lithosphere (PASSCAL) experiment. The functions calculated using a time domain deconvolution approach interpreted terms single layer, with grid‐search comparison observed synthetics. average thicknesses these...
Research Article| November 01, 2004 Tectonics of Pliocene removal lithosphere the Sierra Nevada, California Craig H. Jones; Jones 1Department Geological Sciences and Cooperative Institute for in Environmental Sciences, CB 399, University Colorado, Boulder, Colorado 80309–0399, USA Search other works by this author on: GSW Google Scholar G. Lang Farmer; Farmer Jeffrey Unruh 2William Lettis Associates, 1777 Bothelho Drive, Suite 262, Walnut Creek, 94596, Author Article Information Publisher:...
Previous seismological studies have placed the source of uplift Sierra either within crust, suggesting a Mesozoic age for uplift, or in upper mantle, consistent with late Cenozoic creation buoyant material producing range. We deployed 16 temporary seismometers high part southern Nevada to augment permanent Southern California Seismic Network and record arrivals from regional teleseismic earthquakes. Arrival times P waves 54 teleseisms recorded at these stations are advanced by over second...
21 well‐distributed teleseisms (30° to 100° distance) were recorded by mixed broad‐band (BB) and short‐period (SP) seismic arrays at Mineral King (MK) Horseshoe Meadow (HM) in the southern Sierra Nevada Darwin Plateau (DP) between Inyo Argus ranges. These permit identification separation of direct P S arrivals, reflections from topography, scattered energy, arrivals different back azimuths (multipath arrivals). ‐to‐ conversions can be identified beamed BB or SP seismograms. Least squares...
Seismic tomography reveals garnet-rich crust and mantle lithosphere descending into the upper beneath southeastern Sierra Nevada. The consists of two layers: an iron-rich eclogite above a magnesium-rich garnet peridotite. These results place east high P wave speed material previously imaged southern Great Valley, suggesting unsuspected coherence in lithospheric removal process.
Receiver functions sampling the Sierra Nevada batholith and adjacent regions exhibit significant variations in structure of crust upper mantle. Crustal Vp/Vs values are lower core higher northern Nevada, portions Basin Range, near young volcanic fields eastern Owens Valley. P- to S-wave conversions from Moho vary high amplitude shallow (>25% direct P-arrival amplitude, 25–35 km depth) along low deep (<10%, 45–55 km) beneath western batholith. We propose that dense mafic-ultramafic residue...
The widespread presumption that the Farallon plate subducted along base of North American lithosphere under most western United States and ∼1000 km inboard from trench has dominated tectonic studies this region, but a number variations concept exist due to differences in interpretation some aspects orogeny. We contend five main characteristics are central Laramide orogeny must be explained by any successful hypothesis: thick-skinned tectonism, shutdown and/or landward migration arc...
The impact of increased online gaming play time on psychological wellbeing was examined focusing the Multiplayer Online Battle Arena (MOBA) game genre. This relationship explored with respect to motivators for playing and resilience factors. A cross-sectional, questionnaire design employed participants (N = 165) examine between weekly average hours played wellbeing. Five previously reported were tested as mediating variables. In addition, exploratory analyses conducted determine moderating...
In southern Nevada, Paleozoic isopachs, Mesozoic structures, and mountain ranges trend north–south, but as they approach the right‐lateral, west‐northwest‐trending Las Vegas Valley Shear Zone (LVVSZ), are bent clockwise up to 90° in oroflexes 30 km long. Range declination of characteristic magnetization Cambrian Bonanza King Formation has likewise been rotated more than 50°. For samples from eight sites (13–23 per site) its extension south LVVSZ, stepwise thermal demagnetization 600°C...
Summary The validity of four causal models the relationship between absences and grades was tested in 496 undergraduate psychology students. As predicted, were negatively correlated with grades; results are consistent two this relationship. Absence from class appeared to cause lower but low also more frequent class. These findings interpreted as suggesting that can interact produce a spiral declining academic achievement some
Early, accurate diagnosis of neurodegenerative dementia subtypes such as Alzheimer's disease (AD) and frontotemporal (FTD) is crucial for the effectiveness their treatments. However, distinguishing these conditions becomes challenging when symptoms overlap or present atypically. Resting-state fMRI (rs-fMRI) studies have demonstrated condition-specific alterations in AD, FTD, mild cognitive impairment (MCI) compared to healthy controls (HC). Here, we used machine learning build a diagnostic...
Research Article| October 01, 2004 Distributed deformation in the lower crust and upper mantle beneath a continental strike-slip fault zone: Marlborough system, South Island, New Zealand Charles K. Wilson; Wilson 1Department of Geological Sciences, University Colorado, Cooperative Institute for Environmental Sciences (CIRES), Boulder, Colorado 80309, USA Search other works by this author on: GSW Google Scholar Craig H. Jones; Jones Peter Molnar; Molnar Anne F. Sheehan; Sheehan Oliver S. Boyd...
We apply seismic ambient noise tomography to image and investigate the shallow shear velocity structure beneath Coso geothermal field surrounding areas. Data from a PASSCAL experiment operated within between 1998 2000 broadband stations Southern California Seismic Network are acquired processed. Daily cross correlations of all pairs that overlapped in time deployment were calculated then stacked over duration deployment. Phase velocities Rayleigh waves 3 10 s periods measured resulting...
Teleseismic P-wave tomography using the Sierra Nevada Earthscope Project (SNEP) deployment, older temporary deployments in Sierra, and broadband stations from permanent USArray Transportable Array (TA) was derived starting models either lacking lateral variation (one dimensional [1-D]) or created three-dimensional (3-D) surface-wave models. The use of multiple permits examination robustness different features while limiting inherent ambiguities teleseismic body-wave tomography. Our results...
Research Article| April 01, 2015 Continental uplift through crustal hydration Craig H. Jones; Jones 1Department of Geological Sciences, University Colorado at Boulder, 80309-0399, USA2Cooperative Institute for in Environmental Science, 80309-0216, USA Search other works by this author on: GSW Google Scholar Kevin Mahan; Mahan Lesley A. Butcher; Butcher William B. Levandowski; Levandowski *Current address: U.S. Survey, Golden, 80401, USA. G. Lang Farmer Author and Article Information...
Abstract To investigate the physical basis for support of topography in western U.S., we construct a subcontinent scale, 3‐D density model using ~1000 estimated crustal thicknesses and S velocity profiles to 150 km depth at each 947 seismic stations. Crustal temperature composition are considered, but assume that mantle variations thermal origin. From these densities, calculate topographic contributions. Typical 2σ uncertainty is ~500 m, elevations 84% region reproduced within error....