A5030284581- Astro and Planetary Science
- Planetary Science and Exploration
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Geological and Geochemical Analysis
- earthquake and tectonic studies
- Geological and Geophysical Studies
- Geological formations and processes
- Spacecraft and Cryogenic Technologies
- High-pressure geophysics and materials
- Geomagnetism and Paleomagnetism Studies
- Geophysics and Gravity Measurements
- Space Exploration and Technology
- Scientific Research and Discoveries
- Astrophysics and Star Formation Studies
- Hydrocarbon exploration and reservoir analysis
- Space Satellite Systems and Control
- Spacecraft Dynamics and Control
- Space Science and Extraterrestrial Life
- Stellar, planetary, and galactic studies
- Geological and Geophysical Studies Worldwide
- Landslides and related hazards
- Spaceflight effects on biology
- Geological Formations and Processes Exploration
- Cryospheric studies and observations
University of Alaska Anchorage
2016-2022
Providence College
2016-2019
University of Idaho
2006-2017
ConocoPhillips (United States)
2014-2017
During the development of continental rifts, strain accommodation shifts from border faults to intra-rift faults. This transition represents a critical process in evolution rift basins East African Rift, resulting focusing and, ultimately, breakup. An analysis fault and fluid systems younger than 7 Ma Natron Magadi (Kenya-Tanzania border) reveals as complex interaction between plate flexure, magma emplacement, magmatic volatile release. Rift basin was investigated by analyzing systems, lava...
The Lunar Reconnaissance Orbiter Camera (LROC) is systematically imaging impact melt deposits in and around lunar craters at meter sub‐meter scales. These images reveal that melts, although morphologically similar to terrestrial lava flows of size, exhibit distinctive features (e.g., erosional channels). Although generated a single rapid event, the post‐impact mobility morphology melts surprisingly complex. We present evidence for multi‐stage influx into flow lobes crater floor ponds. Our...
[1] The region surrounding the south pole of Saturn's moon Enceladus shows a young, pervasively fractured surface that emanates enough heat to be detected by Cassini spacecraft. To explain elevated and eruptive icy plumes originating from large cracks (informally called "tiger stripes") in surface, many models implicitly assume global liquid ocean beneath surface. Here we show fracture patterns south-polar terrain (SPT) are inconsistent with contemporary stress fields, but instead formed...
Abstract Observations of active dike intrusions provide present day snapshots the magmatic contribution to continental rifting. However, unravelling contributions upper crustal dikes over timescale rift evolution is a significant challenge. To address this issue, we analyzed morphologies and alignments >1500 volcanic cones infer distribution trends in various basins across East African Rift (EAR). Cone lineament data reveal along‐axis variations geometries as result changing...
We describe a mission concept for stand-alone Titan airplane mission: Aerial Vehicle In-situ and Airborne Reconnaissance (AVIATR). With independent delivery direct-to-Earth communications, AVIATR could contribute to science either alone or as part of sustained Exploration Program. As focused mission, we have envisioned it would concentrate on the that an can do best: exploration Titan's global diversity. focus surface geology/hydrology lower-atmospheric structure dynamics. carefully chosen...
Abstract Phobos, the innermost satellite of Mars, displays an extensive system grooves that are mostly symmetric about its sub‐Mars point. Phobos is steadily spiraling inward due to tides it raises on Mars lagging behind Phobos' orbital position and will suffer tidal disruption before colliding with in a few tens millions years. We calculate surface stress field deorbiting show first signs already present surface. Most prominent have excellent correlation computed orientations. The model...
Abstract We investigate the underlying physical processes that govern formation and evolution of Titan's tectonic features. This is done by mapping mountain chains hills using Cassini RADAR data obtained during Titan flybys T3 to T69. Our reveals a global pattern: east‐west orientations within 30° equator north‐south between 60° latitude poles. result makes one few solar system bodies where processes, rather than regional dominate tectonism. After comparison with five stress models showing...
We characterize fracture evolution in pahoehoe lava flows of the eastern Snake River Plain, Idaho, and highlight significant differences to flood-basalt sheet implications for hydrologic models. There are four distinct types east ern Plain flows: (1) column- bounding; (2) column-normal; (3) entablature; (4) inflation fractures. Types 1–3 driven by thermal stress, whereas type 4 is induced pressure from within flow. Thermal stress distribution a flow dictated its aspect ratio (width/ height),...
A nearly pole-to-pole survey near 140°E longitude on Europa revealed many areas that exhibit past lateral surface motions, and these were examined to determine whether the motions can be described by systems of rigid plates moving across Europa's surface. Three showing plate-like behavior in detail sequence events deformed All three reconstructed reveal original pre-plate motion surfaces performing multi-stage rotations spherical coordinates. Several observed along single plate boundaries...