A5012864717- Planetary Science and Exploration
- Astro and Planetary Science
- Space Exploration and Technology
- Geology and Paleoclimatology Research
- Landslides and related hazards
- Geological and Geochemical Analysis
- Atmospheric and Environmental Gas Dynamics
- Space Science and Extraterrestrial Life
- Methane Hydrates and Related Phenomena
- Geophysical Methods and Applications
- Advanced MRI Techniques and Applications
- Marine and environmental studies
- Geochemistry and Geologic Mapping
- Geophysics and Gravity Measurements
- Cryospheric studies and observations
- Geomagnetism and Paleomagnetism Studies
- earthquake and tectonic studies
- Geological and Geophysical Studies
- Atmospheric Ozone and Climate
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Geological Modeling and Analysis
- Spacecraft and Cryogenic Technologies
- Astrophysical Phenomena and Observations
- MRI in cancer diagnosis
Goddard Space Flight Center
2016-2025
University of Michigan
2024-2025
Texas Tech University
2023
National Aeronautics and Space Administration
2022
University of South Florida
2012-2021
University of Maryland, College Park
2015-2021
Evergreen Health Medical Center
2021
International Space Station
2021
Idaho State University
2021
University of South Florida St. Petersburg
2019
A refinement has been obtained in the earth's gravitational field by using satellite and surface data. In addition to a more complete treatment of data previously employed on 27 satellites, new solution Gem 7 ( Goddard Earth Model 7) includes 64,000 laser measurements taken seven satellites during International Satellite Geodesy Experiment program. 7, containing 400 harmonic terms, is through degree order 16. The companion 8 combines same as with gravimetry over 39% earth. 25. Extensive...
Abstract The Nicoya Peninsula in northwest Costa Rica overlies a section of the subduction megathrust along Middle America Trench. On 5 September 2012, moment magnitude 7.6 earthquake occurred beneath dense network continuous GPS and seismic stations. Many stations recorded event at high rate, 1 Hz or better. We analyze temporal spatial evolution surface deformation after earthquake. Our results show that main rupture was followed by significant afterslip within first 3 h following event....
Numerical simulations of lava flow emplacement are valuable for assessing hazards, forecasting active flows, designing mitigation measures, interpreting past eruptions, and understanding the controls on behavior. Existing models vary in simplifying assumptions, physics, dimensionality, degree to which they have been validated against analytical solutions, experiments, natural observations. In order assess existing guide development new codes, we conduct a benchmarking study computational...
Abstract Geophysical measurements, such as seismic experiments, are a key target for scientific activities on planetary surfaces. Dense spatial sampling of measurements is often desirable, and acquisition traditionally performed at regular intervals. However, achieving dense made difficult by obstacles operational constraints surface mission. Here, we present an application compressive sensing (CS) in the design surveys surfaces imaging shallow subsurface. This approach based more flexible,...
The island of Lanzarote (Canary Islands) is widely recognized as a terrestrial analog for planetary science due to its geological and environmental characteristics. This hosts numerous lava tubes, including the 7.6-km-long La Corona tube, one Earth’s largest. Detecting tubes other subsurface cavities crucial exploration, they may be used safe shelters in future missions. Magnetic data, scalar vector magnetometer data well magnetic susceptibility measurements, were...
Abstract Distributed‐style volcanism is an end member of terrestrial that produces clusters small volcanoes when isolated magma bodies ascend from broad source regions. Volcano can develop over millions years, one volcano at a time, and be used to infer unobserved geologic phenomena, including subsurface stresses cracks during eruption periods. The Tharsis Volcanic Province covers approximately one‐quarter the martian surface hosts large concentration formed distributed volcanism. We present...
Observations made at several pit heaps in County Durham indicated a relationship between high soil temperature and plant growth particularly as it affects colonization by herbs grasses. The object of this paper is to present the results measurements Ouston, Durham, where plants were moving from surrounding countryside. It well known that protoplasm only maintains its normal powers within certain range somewhere maximum minimum values there one, optimum, functions most efficiently. upper...
Volcanic activity often results in the formation of new volcanic vents. These vents can create hazards unexpected areas. Therefore, probability vent should be assessed as part hazard assessments. This paper describes our use kernel density estimation (KDE) a way to estimate spatial future The bivariate Gaussian function is described step-by-step using pseudocode. Our computer code, written PERL, used calculate existing and then contour map GMT (Generic Mapping Tools). Application this method...
Abstract Several large paterae in Arabia Terra are suggested to be calderas that produced colossal explosive eruptions (i.e., supereruptions). If these features indeed calderas, dispersion modeling suggests extensive ash deposits should common throughout the region. However, such have not previously been linked with calderas. Here, we describe layered containing minerals both consistent and diagnostic of altered volcanic Terra. These include Al‐dominant as montmorillonite, imogolite,...
Research Article| November 01, 2015 Role of sills in the development volcanic fields: Insights from lidar mapping surveys San Rafael Swell, Utah J.A. Richardson; Richardson School Geosciences, University South Florida, 4202 E. Fowler Avenue, Tampa, Florida 33617, USA Search for other works by this author on: GSW Google Scholar C.B. Connor; Connor P.H. Wetmore; Wetmore L.J. E.A. Gallant Author and Article Information Publisher: Geological Society America Accepted: 14 Sep 2014 Received: 23 Jun...
We present a new probabilistic lava flow hazard assessment for the U.S. Department of Energy's Idaho National Laboratory (INL) nuclear facility that (1) explores way eruptions are defined and modeled, (2) stochastically samples parameters from observed values use in MOLASSES, simulator, (3) calculates likelihood vent opening within boundaries INL, (4) determines probabilities inundation INL through Monte Carlo simulation, (5) couples with recurrence rates to determine annual INL. Results...
Abstract Remote sensing surveys of the Moon and Mars show evidence lava tubes, which are potential safe havens for human crews their equipment. Ground penetrating radar (GPR) can be used to map tubes because void/rock interface at tube ceilings floors strongly reflects pulses. We have tested capacity GPR sense geometry Lava Beds National Monument in California, USA. detailed light detection ranging (LiDAR) data presented two tubes: Skull Cave, with a few meters overburden, diameter ~10–20 m,...
Abstract Volcanic flood basalt eruptions have been linked to or are contemporaneous with major climate disruptions, ocean anoxic events, and mass extinctions throughout at least the last 400 M years of Earth's history. Previous studies recent history shown that volcanically‐driven cooling can occur through reflection sunlight by H 2 SO 4 aerosols, while longer‐term warming via CO emissions. We use Goddard Earth Observing System Chemistry‐Climate Model simulate a 4‐year duration volcanic...
Abstract The earliest stages of volcanic vent degradation are rarely measured, leaving a gap in the knowledge that informs landform models cinder cones and other monogenetic structures. We documented initial 500-m-long spatter rampart at primary 2014–2015 Holuhraun eruption northern Iceland with high-resolution topographic change maps derived from terrestrial laser scanning (TLS) photogrammetric surveys using an unoccupied aircraft system (UAS). Topographic differencing shows total negative...
Abstract Large volcanic eruptions are known to influence the climate through a variety of mechanisms including aerosol‐forced cooling and warming via emitted CO 2 . The January 2022 Hunga shallow underwater eruption caused an increase in stratospheric water vapor, demonstrated how associated positive radiative forcing can be important component eruption's forcing. We present interactive aerosol model simulations super‐volcanic with range SO emissions that produce feedback effects produced by...
view Abstract Citations (38) References (42) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Coordinated X-ray, optical, and radio observations of YZ Canis Minoris. Karpen, J. T. ; Crannell, C. Hobbs, R. W. Maran, S. P. Moffett, Bardas, D. Clark, G. Hearn, Li, F. K. Markert, H. McClintock, E. Primini, A. Richardson, Cristaldi, Rodono, M. Galasso, Magun, Nelson, Slee, O. B. Chugajnov, Chugainov, Efimov, Yu. Shakhovskoj, N. Shakhovskoy, Viner, Venugopal, V....
view Abstract Citations (60) References (24) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS SAS 3 observations of two X-ray transient events with precursors. Hoffman, J. A. ; Lewin, W. H. G. Doty, Jernigan, Haney, M. Richardson, has observed unusual fast from different sources, one lasting about 150 s and one, approximately 1500 s. Both were preceded by precursor pulses which lasted a few seconds rose fell in less than 0.4 The precursors separated the 'main'...