Ozette Lake is located above the locked portion of the northern Cascadia megathrust and is relatively isolated from other active faults.
Ozette Lake Paleoseismology
Detailed Description
Ozette Lake is located above the locked portion of the northern Cascadia megathrust and is relatively isolated from other active faults. The lake's sediments have preserved a detailed record of seismic events, including underwater landslide events known as mass transport deposits and related turbidite layers, which were likely triggered by powerful earthquakes.
The USGS has long been involved with deep-sea fault mapping, which typically uses a combination of sonar and sediment sampling to study faults offshore, often far beneath the seafloor. Applying similar techniques to lake sediments is a relatively new and growing field.
Using a combination of high-resolution bathymetry, seismic reflection profiles, and sediment core analysis, researchers were able to reconstruct Ozette Lake's post-glacial stratigraphy and identify 30 to 34 distinct event deposits. These deposits, spanning the last 14,000 years, provide a rare glimpse into the frequency and magnitude of past earthquakes in the region.
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Ozette Lake Paleoseismology (AD)
Ozette Lake is located above the locked portion of the northern Cascadia megathrust and is relatively isolated from other active faults.
Related
Coastal and Marine Geohazards of the U.S. West Coast and Alaska
Coastal and marine geohazards are sudden and extreme events beneath the ocean that threaten coastal populations. These underwater hazards include earthquakes, volcanic eruptions, landslides, and tsunamis. The tectonically active west coast of the Americas is prone to such hazards, as it lies along the boundaries of major tectonic plates that make up the Earth's crust—the North American, Caribbean...
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Natural Hazards Mission Area, Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center, 3-D CT Core Imaging Laboratory, Core Preparation and Analysis Laboratory and Sample Repositories, Big Sur Landslides, Deep Sea Exploration, Mapping and Characterization, Subduction Zone Science
Ozette Lake Paleoseismology (AD)
Ozette Lake is located above the locked portion of the northern Cascadia megathrust and is relatively isolated from other active faults.
Ozette Lake is located above the locked portion of the northern Cascadia megathrust and is relatively isolated from other active faults.