All articles tagged with #seismic imaging
Researchers confirm that the Silverpit Crater beneath the North Sea was formed by a 160-meter-wide asteroid about 43–46 million years ago, triggering a tsunami over 100 meters tall and blasting a 1.5-km-high plume of rock and water. Using advanced seismic imaging and analyses of shocked minerals, the study resolves the crater’s origin as an asteroid impact and highlights the rare preservation of an oceanic impact site.
New seismic data and rock fragments confirm the Silverpit feature beneath the southern North Sea is an impact crater formed by a ~160-meter asteroid striking at a shallow angle about 43–46 million years ago, which generated a tsunami over 100 meters high. The findings resolve a long-running debate and place Silverpit among Earth's rare preserved submerged craters, alongside Chicxulub and Nadir.
Geologists say a lithospheric drip—dense lower-crust material sinking into the mantle—pulled the land downward beneath Utah's Uinta Mountains, creating a temporary depression that let the Green River punch a 700-meter canyon through the range around 8 million years ago; as the drip broke off and the crust rebounded, the river remained entrenched, reshaping North America’s hydrology and the continental divide, with seismic imaging and river-network modeling supporting the scenario.
Scientists discovered a massive, 20-kilometer-thick, low-density rock formation beneath Bermuda, challenging traditional island formation theories by suggesting a deep mantle origin linked to ancient volcanic activity and deep carbon-rich mantle processes, which helps explain Bermuda's persistent elevation and unique geological history.
Scientists have discovered a massive, previously unmapped underground structure beneath the Rocky Mountains using advanced seismic technology, challenging existing geological models and prompting further research into Earth's subsurface features.
Scientists have confirmed the existence of the Nadir Crater, a 9 km wide impact crater beneath the Atlantic Ocean floor, formed 66 million years ago by an asteroid likely responsible for the extinction of the dinosaurs. Using advanced seismic imaging, they reconstructed the impact's aftermath, including tsunamis and liquefied sediments, and plan to drill cores to further study this well-preserved site, offering new insights into asteroid impacts and mass extinctions.
Scientists have captured the most detailed 3D seismic images of Axial Volcano off Oregon, revealing complex internal processes and challenging previous theories about silica enrichment in its lava, which could improve understanding of underwater volcano eruptions.
New analysis of the Cascadia subduction zone reveals that one of the tectonic plates is tearing itself apart, indicating a gradual end to this subduction process, which is part of Earth's natural geological cycle. Using seismic imaging, scientists observed faults and fractures suggesting the plate is slowly breaking into smaller microplates, akin to a train derailing gradually, rather than a sudden catastrophe.
Scientists have captured detailed seismic images revealing that the Cascadia subduction zone off Vancouver Island is gradually breaking apart in a step-by-step process, creating microplates and shedding light on how subduction zones end, which has implications for earthquake hazards in the Pacific Northwest.
Scientists have confirmed that the Silverpit Crater in the North Sea was formed by a 40-million-year-old asteroid impact, using advanced seismic imaging and microscopic analysis of drill samples, resolving a long-standing debate about its origin.
Researchers at Penn State used supercomputers to add a time dimension to seismic imaging, revealing hidden underground structures that can block oil access, potentially improving oil extraction efficiency and reducing waste.
Recent seismic studies off Portugal's coast reveal that oceanic plate delamination, caused by serpentinization and decoupling of the mantle from the crust, may explain the region's unusual and destructive earthquakes, shedding light on a previously poorly understood tectonic process.
Scientists have discovered large sections of the North Sea seafloor are flipped upside down due to a rare geological process called stratigraphic inversion, involving dense sand layers sinking into lighter sediments, which could impact understanding of subsurface stability and fluid migration. The process, estimated to have occurred around 5.3 million years ago, was revealed through seismic imaging and may influence future geological and climate-related engineering projects.
A recent study reveals that North America's roots are slowly 'dripping' due to remnants of the ancient Farallon Plate, causing long-term geological changes beneath the continent, observed through advanced seismic imaging, though the process is very slow and unlikely to cause immediate surface changes.
Scientists have discovered that hidden fault structures called polygonal fault systems influence slow earthquakes in New Zealand's Hikurangi subduction zone, providing new insights into their behavior and potential impact on seismic activity and tsunami risk.