A5007764926- Geology and Paleoclimatology Research
- earthquake and tectonic studies
- Landslides and related hazards
- Geological and Geochemical Analysis
- Geological formations and processes
- Geological and Geophysical Studies
- Hydrocarbon exploration and reservoir analysis
- Geological Modeling and Analysis
- Hydrology and Sediment Transport Processes
- High-pressure geophysics and materials
- Geochemistry and Geologic Mapping
- Geological Studies and Exploration
- Aeolian processes and effects
- Archaeology and ancient environmental studies
- Seismology and Earthquake Studies
- Fire effects on ecosystems
- Rangeland and Wildlife Management
- Tree Root and Stability Studies
- Seismic Waves and Analysis
- Seismic Imaging and Inversion Techniques
- Image Processing and 3D Reconstruction
- Archaeology and Natural History
- Cryospheric studies and observations
- Fault Detection and Control Systems
- Tree-ring climate responses
Earth and Space Research
2015-2025
University of Washington
2015-2025
United States Census Bureau
2025
Seattle University
2020
University of Michigan
2009-2013
Cooperative Institute for Research in Environmental Sciences
2012
University of Alabama in Huntsville
2009
University of California, Santa Barbara
2004
Recent theoretical models suggest that topographic characteristics of bedrock channels are products interactions among tectonics, substrate resistance, and the climatically modulated erosive ability river. The degree to which these factors influence form channel profiles is poorly quantified at present. Here we investigate developed across southern flank Santa Ynez Mountains, California. Uniform climate systematic variations in lithology rock uplift rate along range allow comparison...
Abstract The Tibetan Plateau is a prime example of collisional orogen with widespread strike‐slip faults whose age and tectonic significance remain controversial. We present new low‐temperature thermochronometry to date periods exhumation associated Kunlun Haiyuan faulting, two major within the northeastern margin Tibet. Apatite zircon (U‐Th)/He apatite fission‐track ages, which record from ~2 6 km crustal depths, provide minimum bounds on fault timing. Results samples show increased rates...
Structural patterns, global positioning system (GPS) velocities, and Quaternary fault slip rates in northeastern Tibet indicate a transfer of left-lateral from the Kunlun northeast to Haiyuan minor crustal shortening rotation within 200-km-wide stepover zone. Related deformation also continues at least few hundred kilometers north into region diffuse extensional(?) shear or underlain by average thickness crust. Fast, localized along central transforms distributed across 500-km-wide zone...
The coastal Pacific Northwest USA hosts thousands of deep-seated landslides. Historic landslides have primarily been triggered by rainfall, but the region is also prone to large earthquakes on 1100-km-long Cascadia Subduction Zone megathrust. Little known about number these because last magnitude 9 rupture occurred in 1700 CE. Here, we map 9938 bedrock Oregon Coast Range and use surface roughness dating estimate that past fewer than half 1000 years. We find landslide frequency increases with...
Research Article| February 01, 2016 Surface roughness dating of long-runout landslides near Oso, Washington (USA), reveals persistent postglacial hillslope instability Sean R. LaHusen; LaHusen 1Department Earth and Space Sciences, University Washington, Box 351310, Seattle, 98195, USA Search for other works by this author on: GSW Google Scholar Alison Duvall; Duvall Adam M. Booth; Booth 2Department Geology, Portland State University, 1721 SW Broadway, Portland, Oregon, 97201 David Montgomery...
Abstract The establishment of continental-scale drainage systems on Earth is largely controlled by topography related to plate boundary deformation and buoyant mantle. Drainage patterns the great rivers in Asia are thought be highly dynamic during Cenozoic collision India Eurasia, but pattern landscape evolution prior development high eastern Tibet remain unknown. Here we report results petro-stratigraphy, heavy-mineral analysis, detrital zircon U-Pb dating from late Cretaceous–early...
Abstract Strike‐slip faults have long been known for characteristic near‐fault landforms such as offset rivers and strike‐parallel valleys. In this study, we use a landscape evolution model to investigate the longer‐term, catchment‐wide response horizontal fault motion. Our results show that strike‐slip faulting induces persistent state of disequilibrium in modeled landscapes brought about by river lengthening along alternating with abrupt shortening due stream capture. The models also...
Abstract Documenting spatial and temporal patterns of past landsliding is a challenging step in quantifying the effect landslides on landscape evolution. While landslide inventories can map distributions, lack dateable material, reactivations, or time, access, cost constraints generally limit dating large numbers to analyze patterns. Here we quantify record Holocene history deep‐seated along 25 km stretch North Fork Stillaguamish River valley, Washington State, USA, including 2014 Oso...
New detrital low‐temperature thermochronometry provides estimates of long‐term erosion rates and the timing initiation river incision from across interior Tibetan Plateau. We use history this region to evaluate proposed models orogenic development as well regional climatic events. Erosion histories externally drained portion east‐central Plateau are recorded in modern sands major rivers a transect that spans >750 km covers with no published thermochronometric ages. Individual grains eight...
Earthquakes can trigger the failure of tens thousands landslides throughout tectonically active landscapes.  Predicting location and magnitude triggered by seismic shaking remains challenging adds to risk those living in these steep In addition serious human impact, geomorphic consequences simultaneous triggering are likely significant. Moreover, long-term impact earthquake on landscape evolution relatively unexplored, including potential for patterns or processes be used identify...
Abstract Geomorphic features near strike‐slip faults, including offset channels, have long been used in paleoseismology. Recent numerical models suggest that slip rate information can also be expressed far upstream of faults as catchments respond to stream lengthening and shortening due captures along the fault. Slow‐moving show dynamic catchment‐wide responses with migrating ridges changing basins, whereas fast more stable basins distinct topography from faults. Such patterns hold promise...
Rivers are primary agents of erosion, shaping valleys, drainage divides, and controlling the larger-scale landscape dynamics. Mass wasting ‘diffusive’ processes on adjacent hillslopes also impact form dynamics, hilltops, hillsides, adding sediment into channels. Extreme environments, such as hyper-arid deserts, offer a unique natural experiment to isolate modification without continuous fluvial processes. Here, we explore numerical simulations that experiences oscillatory...
Research Article| November 29, 2017 Off-fault deformation rate along the southern San Andreas fault at Mecca Hills, California, inferred from landscape modeling of curved drainages Harrison J. Gray; Gray 1Cooperative Institute for in Environmental Sciences (CIRES) and Department Geological Sciences, University Colorado, Boulder, Colorado 80309, USA Search other works by this author on: GSW Google Scholar Charles M. Shobe; Shobe Daniel E.J. Hobley; Hobley 2School Earth Ocean Cardiff...
Abstract. Here we examine the landscape of New Zealand's Marlborough Fault System (MFS), where Australian and Pacific plates obliquely collide, in order to study evolution controls on fluvial patterns at a long-lived plate boundary. We present maps drainage anomalies channel steepness, as well an analysis plan-view orientations rivers faults, find abundant evidence structurally controlled that relate history capture rearrangement response mountain-building strike-slip faulting. Despite clear...
Abstract Observations at the field, catchment, and continental scales across a range of arid semiarid climates latitudes reveal aspect‐controlled patterns in soil properties, vegetation types, ecohydrologic fluxes, hillslope morphology. Although global distribution solar radiation on earth's surface its implications dynamics are well documented, we know little about how variation influence landscape evolution resulting geomorphic difference. Here, used model that couples continuity equations...
Abstract The ~150‐km‐wide dextral Marlborough Fault System and adjacent Kaikōura Mountains accommodate oblique convergence between the Pacific Australian plates at NE end of South Island, New Zealand. Low‐temperature thermochronology from this region places new limits on timing style faulting mountain building. We sampled rocks for apatite zircon (U‐Th/He) fission track dating a range elevations spanning ~2 km within Ranges, which stand high above active faults. data reveal Miocene cooling...
Researchers examine the rings of drowned trees in landslide-dammed lakes for clues to today’s earthquake hazards Pacific Northwest.
Abstract Strike‐slip landscapes are often associated with a suite of characteristic geomorphic features that provide primary evidence for interpreting fault slip histories. Here we explore the role shutter ridges, areas relief advected laterally along faults, in generating two classic strike‐slip processes: progressive lateral offset channels and stream capture. Landscape models comparative analysis Marlborough Fault System, NZ, show length channel offsets observable landscape is primarily...
Abstract Infrequent, large‐magnitude discharge (>10 6 m 3 /s) outburst floods—megafloods—can play a major role in landscape evolution. Prehistoric glacial lake megafloods transported and deposited large boulders (≥4 m), yet few studies consider their potential lasting impact on river processes form. We use numerical model, constrained by observed boulder size distributions, to investigate the fluvial response deposition megaflooding Yarlung‐Siang River, eastern Himalaya. Results show that...