A5006911186- earthquake and tectonic studies
- Geology and Paleoclimatology Research
- Geological and Geochemical Analysis
- Geological formations and processes
- Geological and Geophysical Studies
- Seismology and Earthquake Studies
- Methane Hydrates and Related Phenomena
- Earthquake Detection and Analysis
- Geological Studies and Exploration
- High-pressure geophysics and materials
- Landslides and related hazards
- Seismic Imaging and Inversion Techniques
- Geological and Tectonic Studies in Latin America
- Geochemistry and Geologic Mapping
- Hydrocarbon exploration and reservoir analysis
- Geological and Geophysical Studies Worldwide
- Seismic Waves and Analysis
- Geological Modeling and Analysis
- Marine and fisheries research
- Planetary Science and Exploration
- Marine Biology and Ecology Research
- Geotechnical and Geomechanical Engineering
- Marine and coastal plant biology
- Marine and environmental studies
- Reservoir Engineering and Simulation Methods
Oregon State University
2014-2024
First posted July 12, 2012 For additional information, contact: Active Tectonics and Seafloor Mapping LabOregon State UniversityCollege of Earth, Ocean, Atmospheric SciencesBurt 130, Corvallis OR 97331 Turbidite systems along the continental margin Cascadia Basin from Vancouver Island, Canada, to Cape Mendocino, California, United States, have been investigated with swath bathymetry; newly collected archive piston, gravity, kasten, box cores; accelerator mass spectrometry radiocarbon dates....
▪ Abstract We present preliminary evidence for a ∼10,000-year earthquake record from two major fault systems based on sediment cores collected along the continental margins of western North America. New stratigraphic Cascadia demonstrates that 13 earthquakes ruptured entire margin Vancouver Island to at least California border since eruption Mazama ash 7700 years ago. The events above this prominent marker have an average repeat time 600 years, and youngest event ∼300 ago coincides with...
Research Article| January 01, 2013 Superquakes and Supercycles Chris Goldfinger; Goldfinger aOregon State University, College of Earth, Ocean, Atmospheric Sciences, 104 Ocean Admin. Bldg., Corvallis, Oregon 97331‐5506 U.S.A.gold@coas.oregonstate.edu Search for other works by this author on: GSW Google Scholar Yasutaka Ikeda; Ikeda bDepartment Earth Planetary Science, University Tokyo, Hongo 7‐3‐1, Bunkyo‐ku, Tokyo 113‐0033, Japanikeda@eps.s.u-tokyo.ac.jp Robert S. Yeats; Yeats cDepartment...
The Cascadia subduction zone (CSZ) is an exceptional geologic environment for recording evidence of land-level changes, tsunamis, and ground motion that reveals at least 19 great megathrust earthquakes over the past 10 kyr. Such are among most impactful natural hazards on Earth, transcend national boundaries, can have global impact.Reducing societal impacts future events in US Pacific Northwest coastal British Columbia, Canada, requires improved scientific understanding earthquake rupture,...
Global Positioning System vectors and surface tilt rates are inverted simultaneously for the rotation of western Oregon plate locking on southern Cascadia subduction thrust fault. Plate appears to be largely offshore, consistent with earlier studies, is sufficient allow occasional great earthquakes inferred from geology. Clockwise most about a nearby pole likely driven by collapse Basin Range results in shortening NW Washington State. The lies along Olympic‐Wallowa lineament explains...
High‐precision GPS geodesy in the Pacific Northwest provides first synoptic view of along‐strike variation Cascadia margin kinematics. These results constrain interfering deformation fields a region where typical earthquake recurrence intervals are one or more orders magnitude longer than decades‐long history seismic monitoring and geologic studies sparse. Interseismic strain accumulation contributes greatly to station velocities along coast. After correction for simple elastic dislocation...
We relate the late Holocene northern San Andreas fault (NSAF) paleo- seismic history developed using marine sediment cores along California continental margin to a similar dataset of collected Cascadia margin, including channels from Barclay Canyon off Vancouver Island just north Mon- terey Bay. Stratigraphic correlation and evidence synchronous triggering imply earthquake origin, both temporal records are compatible with onshore paleoseis- mic data. In order make comparisons between NSAF...
In order to investigate the possibility of a long-term paleoseismic history from offshore sedimentary records in Sumatra, we collected 144 deep-sea sediment cores trench and lower slope piggyback basins Sumatra accretionary prism. We used multibeam bathymetry seismic reflection data develop an understanding catchment basins, turbidity current pathways, depositional styles, as well precisely locate our gravity cores, piston Kasten multicores. use detailed physical property data, including...
Abstract The seismic potential of the Lesser Antilles subduction zone is poorly known and highly debated. Only two damaging earthquakes have been reported in historical period, 1839 1843, but their sources magnitude are still uncertain. Global Navigation Satellite Systems coral data contradict each other, no conclusion has reached on coupling ratio plate interface. Given threat posed by possible occurrence a large megathrust earthquake, it crucial to gain information prehistorical events. We...
New stratigraphic evidence from the Cascadia margin demonstrates that 13 earthquakes ruptured Vancouver Island to at least California border following catastrophic eruption of Mount Mazama. These events have occurred with an average repeat time ?? 600 years since first post-Mazama event 7500 ago. The youngest 300 ago probably coincides widespread coastal subsidence and tsunami inundation in buried marshes along coast. We can extend Holocene record 9850 years, during which 18 correlate same...
Maximum earthquake magnitude ( m x ) is a critical parameter in seismic hazard and risk analysis. However, some recent large earthquakes have shown that most of the existing methods for estimating are inadequate. Moreover, itself ill‐defined because its meaning largely depends on context, it usually cannot be inferred using data without associating with time interval. In this study, we use probable maximum within period interest, p( T ), to replace . The term contains not only information...
Characterizations of tsunami hazards along the Cascadia subduction zone hinge on uncertainties in megathrust rupture models used for simulating inundation. To explore these uncertainties, we constructed 15 earthquake scenarios using that supply initial conditions simulations at Bandon, Oregon. Tsunami inundation varies with amount and distribution fault slip assigned to models, including where is partitioned a splay accretionary wedge vary updip limit buried fault. Constraints come from...
Here, we disentangle a complex disturbance deposit sequence attributed to the ~M 7 1873 CE Brookings earthquake from lower Acorn Woman Lake, Oregon, USA, using sedimentological techniques, computed tomography, and micro-X-ray fluorescence. The portion of is derived schist bedrock has characteristics similar local landslide deposit, but present in all cores, suggesting that it result high frequency (>5 Hz) ground motions crustal triggered landslide. In contrast, upper 1700 Cascadia...
A remarkable set of west-northwest-trending left-lateral strike-slip faults intersects the Cascadia subduction zone. Three these have been mapped off northern and central Oregon by using seismic reflection, SeaMARC-1A sidescan sonar, SeaBeam bathymetry. These are highly oblique to north-south structural grain active accretionary wedge. One them has 6 km horizontal slip; average slip rate is 7-10 mm/yr. The cut subducting Juan de Fuca plate, can be traced into North American plate. Folds that...
At least nine WNW trending left‐lateral strike‐slip faults have been mapped on the Oregon‐Washington continental margin using sidescan sonar, seismic reflection, and bathymetric data, augmented by submersible observations. The range in length from 33 to 115 km cross much of slope. Five offset both Juan de Fuca plate North American plates boundary with little or no frontal thrust. Left‐lateral separation channels, folds, Holocene sediments indicate active slip during late Pleistocene. Offset...
We test hypothetical tsunami scenarios against a 4,600‐year record of sandy deposits in southern Oregon coastal lake that offer minimum inundation limits for prehistoric Cascadia tsunamis. Tsunami simulations constrain coseismic slip estimates the megathrust and contrast with deficits implied by earthquake recurrence intervals from turbidite paleoseismology. model tsunamigenic seafloor deformation using three‐dimensional elastic dislocation three rupture scenarios: partitioned to splay...