Articles tagged with Geologic History
Researchers from Columbia University and USGS develop a physics-based model that replicates California's statistical seismic hazard model. This breakthrough marks a turning point in earthquake forecasting, providing accurate hazard estimates for engineers and regulators to make informed decisions on building codes and construction costs.
A new model provides the clearest picture yet of the geology below the Tibetan Plateau, revealing tears in the Indian upper mantle layer. The research suggests that these tears are responsible for earthquakes in the region, shedding light on the complex geological processes at play.
Scientists have discovered regions with lower seismic wave velocities beneath both ends of the Cascadia fault zone, indicating rising pieces of the Earth's upper mantle. These anomalies could modulate plate coupling forces and influence the location, frequency, and strength of earthquake events.
Researchers found low oxygen levels in early Earth rocks, indicating significant atmospheric variations during early life development. Oxygen concentrations were around 0.1% of present levels, affecting the evolution of complex organisms.
A team of scientists has discovered that Yosemite granite minerals crystallized at lower temperatures than previously thought, challenging our understanding of how granites form and record the planet's history. This finding has significant implications for geoscientists studying the Earth's crust formation and volcanic processes.
A new data-mining technique developed by Carnegie's Shaunna Morrison improves the understanding of Mars' geologic history and habitability. By analyzing mineral compositions and unit cell dimensions, scientists gained a more detailed picture of Martian minerals, including their origins and alteration processes.
Scientists reconstruct Earth's history with a new method that links astronomical theory to geological observation, enabling the analysis of ancient climate change. The study reveals days on Earth were over 18 hours long 1.4 billion years ago, and the moon's movement away contributed to the lengthening day.
Researchers developed a statistical approach combining astronomical theory and rock formation data to estimate Earth's axial precession rate and distance from the Moon. The study also reconstructed periods of astronomically influenced climate cycles, providing insights into ancient Solar System behavior.
Researchers reexamined historical seismograms from the 1906 Meishan earthquake to uncover a new mechanism that better fits fault rupture and damage patterns. This discovery will help improve understanding of complex fault systems in the region.
An international team of geoscientists has discovered an extensive buried mass of material on the seafloor, thought to have been eroded by the Zanclean flood. The mass covers an area equivalent to the island of Crete and is up to 900m thick in places.
A study by Brown University researchers maps the mineralogy of the South Pole-Aitken basin, a giant impact crater on the Moon's far side. The research identified four distinct mineralogical regions within and around the basin, providing insights for future lunar exploration and landing site selection.
Analysis of Réunion volcanic rocks indicates that their source material originates from isolated regions of the mantle with distinct chemistry. The discovery provides a unique fingerprint for the age and history of these ancient mantle pockets.
Researchers found that high atmospheric oxygen levels were not critical to the origin of animals, but rather occurred between 540 and 420 million years ago. The transition to a world with an oxygenated deep ocean required significant changes in atmospheric O2 levels, which approached modern levels around 400 million years ago.
A new study suggests that heat from a deep-seated oceanic mantle source, rather than a traditional mantle plume, drives crustal melting and surface volcanism in the western US. The research uses seismic tomography to peer into the subsurface and develop a hybrid geodynamic model that better matches observed geologic histories.
Researchers found that water in minerals can split up under extreme pressure, liberating oxygen to combine with iron and create a novel mineral. This discovery could have implications for the Earth's geologic history and potentially explain the Great Oxygenation Event.
Reservoirs of oxygen-rich iron between the Earth's core and mantle may have played a major role in shaping our planet's history. The discovery suggests that massive iron dioxide rocks could be generated annually above the core, releasing oxygen into the atmosphere, potentially triggering the Great Oxygenation Event.
Scientists confirm the presence of vinyl cyanide on Saturn's moon Titan, suggesting chemical processes analogous to those important for life on Earth. The findings provide insights into Titan's unique environment and potential prebiotic chemistry.
Researchers at UBC have discovered a unique sequence of pressure and temperature events required to form high-quality Canadian sapphires. This discovery will facilitate gemstone exploration in southern Baffin Island and potentially unlock new sources worldwide.
A new study published in Nature Communications suggests that the Tibetan Plateau's unique shape may be explained by the strength of the tectonic plates involved in its formation. The research found that a strong Asian plate results in a narrow plateau, while a weak Asian plate produces a broad one.
Researchers have discovered that sedimentary cycles are linked to sea level changes, rather than mountain erosion. The study uses carbon isotopes to predict sedimentary rock distribution and better understand the Earth's sedimentary history.
Researchers discovered that Titan's river networks, like Mars', formed topography without plate tectonics. This finding suggests a distinct geological history for the moons of Saturn and challenges our understanding of Earth's unique surface.
Scientists at ANU analyzed ancient zircon mineral grains to reconstruct the early Earth's surface. The study reveals that the planet remained relatively quiet and calm for its first 700 million years, with no major mountain-building events or continental collisions.
Scientists at McGill University propose a new theory on how Earth's crust was created, suggesting that silica-rich minerals condensed and fell back to earth over about a million years. This process, called aerial metasomatism, could provide clues for the search for life on exoplanets.
A study by Australian National University reveals the world's biggest volcanoes in Hawaii formed along twin tracks due to a shift in the Pacific Plate's direction three million years ago. The discovery helps reconstruct Earth's history and understand volcanic activity away from tectonic plate boundaries.
The Kaikoura earthquake triggered widespread slow slip events, producing simultaneous patches of slip in other areas. Ground faulting was complex, rupturing at nine to 12 faults with multiple orientations, resulting in a combined rupture length of about 180 kilometers.
A team of scientists has discovered a rare sample of the mineral majorite, which originated at least 235 miles below Earth's surface. The discovery provides valuable insights into the dynamic processes occurring deep inside the Earth and its history, including the formation of mountain ranges that persist today.
Researchers found geochemical anomalies, known as 'fingerprints' of early Earth conditions, in young volcanic rocks from Hawaii and Samoa. These signatures suggest that the planet's interior may not be well mixed after all.
The next generation TimeTree web combines molecular sequencing data with geological timelines and environmental information. Users can now explore the history of life on Earth in detail, tracing species evolution through time and comparing divergence times between species.
Scientists have found evidence of Earth's first example of recycling, where its own crust was reworked and reused over 4 billion years ago. The discovery uses neodymium isotope analysis to study variations in the element's abundance, indicating that ancient rocks were compositionally similar to younger basaltic oceanic crust.
A team of European paleontologists challenged the fundamentals of echinoderm evolution by discovering that some ancient groups survived the end-Paleozoic extinction. The findings revealed that these surviving echinoderms coexisted with modern sea urchins and brittle stars, stretching across various paleo-environments by the late Triassic.
Researchers propose that massive volcanic eruptions 717 million years ago led to a perfect storm of fire and ice, causing the largest glaciation event in Earth's history. The eruptions released sulfur dioxide into the atmosphere, blocking solar radiation and driving the formation of ice.
Researchers discovered that a mineral found in Martian meteorites could indicate a more water-rich history for the Red Planet. Synthetic whitlockite samples were subjected to shock experiments and X-ray studies, revealing partial conversion to merrillite, which is commonly found in Martian meteorites.
Researchers uncovered evidence of life at least 3,770 million years old from iron-rich deep-sea hydrothermal vents on Earth. The discovery provides direct proof of one of the oldest life forms on the planet.
Scientists found evidence of an ancient solid shell on Earth's surface using thermodynamic calculations and rock samples from Western Australia. The 'stagnant lid' model supports this theory, which contradicts the long-held assumption that plate tectonics began immediately after Earth formed.
Utah State University geologist Alexis Ault is investigating the earthquake history of the Wasatch Fault using nanoscale clues. She is collaborating with middle school students to explore this research, which provides a new window into processes that cause earthquakes at the nano-scale.
Researchers discovered minerals from 43 ancient meteorites, including rare and unknown types. This finding suggests a dramatically different solar system history, requiring a revision of current understanding. The study's results confirm a hypothesis presented last summer and show that the solar system is not stable over time.
A new analysis published in the Bulletin of the Seismological Society of America suggests that a tiny North Korean seismic event in May 2010 was an earthquake, not a nuclear explosion. The study's findings contradict previous reports that claimed it was a small nuclear test.
A newly discovered valley on Mercury is about 250 miles wide and 600 miles long, with steep sides that dip as much as 2 miles below the surrounding terrain. The valley likely formed due to rapid cooling of Mercury's interior, which would challenge previous assumptions about the planet's geologic past.
A new study published in the Bulletin of the Seismological Society of America suggests that a handful of damaging earthquakes in the Los Angeles Basin may have been induced by oil production activities in the early 20th century. The researchers found links between earthquakes and significant oil production activities nearby, but note t...
A new study confirms that the entire 2,400-kilometer Himalayan mountain range is seismogenic and can produce large earthquakes. Researchers discovered a major earthquake in Bhutan in 1714 using historical records and geologic data, shedding light on the region's potential for natural hazards.
A new study by Yale University researcher Jun Korenaga suggests that planets like Earth form through multiple giant impacts, leading to diverse sizes and internal temperatures. This lack of self-regulating mantle convection has significant implications for planetary habitability.
Researchers studied 7th-century A.D. temples in northwest India to reconstruct historic earthquakes, finding evidence of damage from magnitude 7.8 and 7.6 quakes. The study extended rupture zones for two major earthquakes, suggesting the region is prone to powerful earthquakes.
Researchers discovered microscopic crystals telling of unimaginable pressures and temperatures when a 12-kilometer asteroid formed Meteor Crater. The zircons endured temperatures of 2,000 degrees Celsius, revealing an unusual realm for geology where extreme pressure and temperature occur briefly.
Researchers from the University of Sydney and the University of Potsdam have uncovered a distinct two-phase separation process for continental breakup, involving gradual rifting and eventual rapid subsidence. The study highlights a phenomenon difficult to explain within conventional plate tectonics, shedding new light on the process.
A team from Southwest Research Institute suggests that asteroid impacts during the early days of Earth's history led to a massive greenhouse effect, stabilizing temperatures and delivering essential elements for life. This mechanism may have played a key role in sustaining liquid water on our planet.
Researchers discovered that iron's ability to transmit heat matches previous estimates, suggesting energy necessary for geodynamo has been available since early Earth's history. The study used a laser-heated diamond anvil cell to mimic planetary core conditions and study iron's thermal conductivity.
A new study suggests that the Riasi fault in Indian Kashmir has been building up pressure for thousands of years, potentially leading to a magnitude 8.0 or greater earthquake. The fault's lack of recent seismic activity increases the likelihood of a major event, posing a significant threat to millions of people in the region.
Researchers from Trinity College and Swedish Museum of Natural History found zircon crystals formed in younger impact craters are indistinguishable from ancient ones, suggesting many ancient crystals formed in violent impact settings. This challenges the long-held theory that these crystals formed during tectonic plate collisions.
A new study reveals that volcanic activity associated with continental plate movement may have driven climatic shifts from hot to cold over tens and hundreds of millions of years. The research found that periods of high volcanic activity coincided with warmer conditions, while low volcanic activity was linked to colder, icehouse periods.
A team of researchers from Germany and the UK used high-resolution electron microscopy to study magnetic vortices in magnetite minerals, revealing that they are surprisingly resilient to temperature changes. The findings have significant implications for understanding the Earth's magnetic field history and plate tectonics.
Researchers discovered a significant shift in copper isotopic composition, indicating the Great Oxidation Event's gradual increase in atmospheric oxygen. This finding provides a tool to track fluctuations in oxygen levels throughout Earth's history and sheds light on the evolution of life.
Scientists used mafic dikes to determine the connection between northern Laurentia (North America) and southern Siberia for over a billion years. The study reveals new arrangements of continental blocks within Nuna-Columbia and Rodinia, with potential economic implications for mining companies.
Researchers aim to learn about changes in Martian-like sand dunes' grain size, chemical composition, and shape. They seek evidence of microbial organisms in similar environments as Earth, which could provide clues about Mars' past habitability.
A study by GFZ researchers reveals that Earth's internal heat is responsible for the rapid flow of Greenland's ice, driven by a geothermal anomaly that originated from the Icelandic mantle plume. The anomaly creates a region with abundant subglacial meltwater, lubricating the base of the ice and making it flow rapidly.
New research reveals that human-driven carbon release rate is 10 times faster than any event since the age of dinosaurs. The study uses sediment cores and numerical simulations to extract rates of change, showing a maximum sustained carbon release rate of about one-tenth the current rate.
Scientists have found that the North Anatolian Fault Zone can produce mega earthquakes of magnitude M8 exclusively in the east. In contrast, northwestern Turkey, including Istanbul, is not expected to experience such large earthquakes exceeding M7.5. The study suggests that the eastern region's older age and mature fault zone contribut...
Researchers have identified 10 additional superchrons in the Proterozoic Eon, revealing a similar rate of geodynamo-driven reversals for most of the past two billion years. This discovery challenges existing models of core evolution and the geodynamo process.
A new study from the University of Maryland provides geochemical evidence for the onset of plate tectonics around 3 billion years ago. The analysis of trace element ratios correlates to magnesium content in ancient rocks suggests that this process began during the Archean eon.
Scientists have discovered geological evidence of frequent large tsunamis in the Aleutian Islands, posing a new hazard to the Pacific basin. The study reveals that a creeping section of the Aleutian Subduction Zone fault could generate earthquakes great enough to trigger devastating tsunamis.
Researchers analyzed woody debris and used radiocarbon dating to map the history of activity at the Oso site. The study shows that slopes in the area around Oso have collapsed on average once every 500 years, with a higher rate of about once every 140 years over the past 2,000 years.