Articles tagged with Plate Tectonics
Researchers from Macquarie University have found that the Earth's gradual cooling led to a flip in the deep cycling of carbon and chlorine between the surface and interior. Most carbon accumulates into solid carbonate sediments, while chlorine typically returns to the surface as volcanic gases.
A team of scientists at Caltech used a section of fiber optic cable to measure the intricate details of a magnitude 6 earthquake, pinpointing four individual asperities that led to the rupture. The study demonstrates the potential of distributed acoustic sensing technology to improve our understanding of earthquake physics.
Researchers from the University of Tokyo and Stanford University analyze slow and fast earthquakes, showing that their magnitudes vary with time. The study confirms the scaling law for slow earthquakes, which defines the relationship between magnitude and duration, and reveals physical processes governing events.
A global team led by University of Minnesota professor Donna Whitney accurately determined the age and formation process of the East Anatolian fault, which runs from eastern to south-central Turkey. The study sheds light on the earthquake history and seismic activity in the region.
Researchers found a hierarchical rupture growth through a complex fault network, promoting and halting rupture growth. The earthquakes' source areas developed a network of faults with bends, steps, and branches, leading to irregular rupture evolution and diverse triggering behaviors.
A groundbreaking study finds that microbial life can exist without plate tectonics, challenging a fundamental theory of geology. Zircon crystals from the Barberton Greenstone Belt reveal a stagnant lid regime on ancient Earth, leading to continent formation and potentially habitable conditions.
Scientists have discovered that stagnant lid tectonics, not plate tectonics, existed on early Earth, releasing heat and forming continents. This finding contradicts previous assumptions about the role of mobile plate tectonics in life's emergence, suggesting an alternative mechanism was present.
New research from Rice University suggests that ancient microorganisms helped cause massive volcanic events by facilitating the precipitation of minerals in banded iron formations. The study provides insight into processes that could produce habitable exoplanets and reframes scientists' understanding of Earth's early history.
Satellite imagery revealed a rupture zone of approximately 75 km in length, with surface features showing a gradual widening and decrease in horizontal dislocations. The study found secondary hazards such as liquefaction mainly occurring in low-lying terrain.
Researchers confirm that water causes incipient melting, leading to reduced S-wave velocity and enhanced electrical conductivity. The presence of low-velocity zones in continental China is attributed to basal hydration weakening the lithosphere, converting it into asthenosphere.
Researchers used a novel method to study tectonic plate movement, finding two significant slowdowns in the South American plate over the past 15 million years. These events may have contributed to the widening of the Andes mountain range by causing unstable material to tear free and sink into the mantle.
Researchers investigated the relationship between slow slip events and tectonic strain in Japan's Bungo Channel, Tokai, and Boso-Oki regions. They found that not all accumulated strain is released during SSEs, but rather builds up in shallower areas before a megathrust earthquake can occur.
Researchers have discovered a new layer of partly molten rock under the Earth's crust that helps settle a long-standing debate about how tectonic plates move. The study reveals that the melt layer has no significant influence on plate tectonics, with convection of heat and rock being the prevailing force.
A new study analyzes volcanic rock samples collected in the 1980s to explain the geologic histories of Fiji and Vanuatu. The research attributes their current locations to subduction of the Samoan Seamount Chain, which caused a double-saloon door tectonic event leading to their separation.
A team at the University of Tokyo has discovered that analyzing the ratio of argon-40 to helium-3 in magma gases can indicate the risk of different types of eruption. By monitoring these gas ratios, scientists hope to develop a portable equipment for real-time, on-site measurements, enabling early warning systems and potentially saving...
A team of researchers led by Goethe University Frankfurt analyzed a diamond from Botswana, revealing significant amounts of water stored in the transition zone. The discovery has far-reaching consequences for the dynamic situation inside the Earth, potentially altering global material circulation.
Scientists have found that the tectonic stress in Japan's Nankai subduction zone is less than expected, contradicting predictions of a major buildup of pent-up energy. The research suggests that the fault may not be as unstable as thought, but still requires further investigation and long-term monitoring.
A new study reveals two preserved slabs in the upper mantle beneath Myanmar, strongly supporting the double subduction model. The findings provide convincing geoscientific evidence to consolidate this model, which explains anomalously fast India-Asian convergence.
A new study by researchers at University of California - Riverside found that the position of continents can have a devastating effect on deep ocean creatures. Continental movement can cause a sudden collapse in global water circulation, leading to a stark separation between oxygen levels in the upper and lower depths.
A novel three-dimensional model of the fluid stored deep in Earth's crust along the Cascadia Subduction Zone provides new insight into how the accumulation and release of those fluids may influence seismic activity. The study's findings have applications for increasing understanding of seismic activity along the Cascadia Subduction Zone.
A recent study published in Nature Communications has uncovered the likely Martian origin of a 4.48-billion-year-old meteorite named Black Beauty. The team found that this ancient fragment may have come from a region on Mars similar to Earth's continents, providing valuable insights into our planet's geological past.
Scientists propose a new classification scheme using the Beaumont number to describe whether mountain elevation is controlled by weathering and erosion or properties of the Earth's crust. The study resolves a long-standing question about the controlling factors of mountain growth, finding that it depends on geographic location, climate...
Low-frequency tectonic tremors in Alaska are linked to high levels of dehydration in the Yakutat terrane, a subducting oceanic plateau. The study suggests that this dehydration reaction is caused by temperature and pressure conditions during plate subduction.
Researchers found that some magmas originate from mantle portions with early crust remnants, suggesting a 'graveyard' of old material survived for billions of years. This discovery sheds light on the formation of large continents and the evolution of Earth's atmosphere.
Tiny zircons found in South Africa hold the oldest evidence of subduction, a key element of plate tectonics, dating back to around 3.8 billion years ago. This discovery provides new insights into when plate tectonics was set in motion and how it may have shaped Earth's surface and climate.
Researchers have discovered a surprisingly soft mineral, davemaoite, that plays a crucial role in the Earth's recycling of rocks. The study suggests that davemaoite is around 1,000 times softer than other minerals in the mantle, and its mechanical properties can help explain how earthquakes and volcanoes occur.
Researchers created a 3D tectonic model combining geological, geophysical and satellite data to resolve timescales between earthquakes and mountain range formation. The study reveals that most uplift occurs in the period between earthquakes, improving local seismic hazard maps.
Researchers analyzed the 2018-2019 Bungo Channel slow slip event to gain insight into megathrust earthquake behavior. Despite its short duration, this event was larger in terms of slippage amount and slip velocity compared to past events, providing valuable information for predicting future earthquakes.
A recent study by a UT graduate student has unraveled the enigma of how tectonic plates break Earth's rock-hard shell. By monitoring seismic images and matching them with rock samples, the researcher found that a small break in the Australian plate grew over millions of years until it unzipped and set in motion a runaway geologic process.
Researchers found that the Central Tibetan Valley was at a relatively low elevation of 1,700 m between 50–38 mya and rose rapidly to over 4,000 m between 38–29 mya. This rise led to significant climate change, transforming the region from a subtropical ecosystem to an alpine one.
Researchers used big data imaging to visualize the entire subterranean formation and its effect on regional tectonics. The findings provide critical information for predicting near-future earthquake processes.
A new study verifies that ancient glaciers caused the erosion of rocks up to 3 miles thick during the Snowball Earth period, resolving a long-standing debate. The research uses thermochronology to estimate temperature and thermal structure, finding a widespread signal of rapid cooling consistent with massive glacier erosion.
Researchers have confirmed that the frequency of asteroid collisions forming impact craters on Mars has been consistent over the past 600 million years. The study used a crater detection algorithm to analyze more than 500 large Martian craters and found no significant variation in asteroid collision frequencies.
New research suggests that ultra-low velocity zones in the deep mantle may be regions made of different rocks than the rest of the mantle, with compositions potentially linked to the early Earth. The study's findings imply the presence of layered structures within these zones, shedding light on their origin and evolution.
A new study reveals that modern top-down climate-related factors combined with traditional bottom-up tectonic models can help uncover the history of the Andes Mountains. The research suggests that a submerged volcanic hotspot chain, known as the Juan Fernandez Ridge, plays a crucial role in shaping the Andes' unique tectonic setting.
New research reveals that sinking tectonic plates are significantly weakened as they enter the mantle, but not broken apart entirely. The study's computer model shows a 'tectonic snake' shape, with stresses pinching the plate along weak points.
Researchers from Washington University in St. Louis have discovered a new type of exoplanet known as 'eggshell planets,' which are likely to have little topography and no plate tectonics. These planets may resemble the lowlands on Venus, with vast expanses of lava but little high-standing terrain.
A recent study suggests that strike-slip faulting is an active deformation mechanism on Titan's surface, driven by diurnal tidal stresses and pore fluid pressures. The researchers found that shallow faults near the equator are optimally oriented for potential failure, which could facilitate material transport and affect habitability.
A geoscientist is using a $640,000 NSF grant to investigate why the Earth retains surface water instead of sequestering it in the mantle. He aims to develop a novel technique that links noble gas concentrations with water in subducted rocks to construct a map of water concentration across pressures and temperatures.
Scientists at Ehime University successfully measured the longitudinal and shear velocities of MgSiO3 majorite garnet up to 18 GPa and 2000 K. The results suggest that elastic softening occurs in mantle garnets with increasing pressure, potentially affecting subducted slab speeds.
A new study led by the University of Colorado Boulder has shed new light on the Great Unconformity, a mysterious gap in the Grand Canyon's rock record that covers hundreds of millions of years. The research suggests that a series of small faulting events may have caused rocks and sediment to wash away, creating the missing window of time.
Scientists aim to develop computer models that can forecast earthquake chances and impact, like weather forecasting. The project will also train students and researchers from diverse backgrounds to work on computational geoscience.
Carbon dioxide played a crucial role in warming early Earth's climate, offsetting the reduced light from the young Sun. The δ18O ratio of ancient seawater suggests a warm but not hot environment, with high CO2 concentrations, around 3 billion years ago.
Researchers used ancient zircons to reconstruct Earth's evolution and determine that modern plate tectonics emerged roughly 3.6 billion years ago. This finding suggests that the dynamic crust, which supports life on Earth, began to take shape during this time.
Scientists have discovered that weathering of continental rock began about 3.7 billion years ago, significantly earlier than previously estimated. This finding has crucial implications for plate tectonics and biological evolution, shedding new light on the early Earth's environment.
Researchers identified eight California faults with higher rates of magnitude 4 earthquakes before a magnitude 6.7 quake, predicting their likelihood for future large earthquakes. So far, only one such event has occurred since the forecast was made in 2017.
A revised position for primary strand of the Pleistocene-Holocene San Andreas Fault in Southern California suggests a previously overlooked strand poses a significant earthquake threat. The Mission Creek strand accounts for nearly its entire slip rate, indicating it may be the primary Pacific-North American plate boundary fault at this...
Researchers from Curtin University discovered the first solid evidence of the start of the supercontinent cycle, finding that plate tectonics operated differently two billion years ago. The study suggests that a single supercontinent may not have existed before this time period.
A team of seismologists has discovered a new mechanism driving the separation of the Atlantic plates, with evidence of an upwelling in the mantle from depths of over 600 km. This finding provides greater understanding of plate tectonics and its role in natural disasters such as earthquakes and tsunamis.
Researchers suggest that a large lake overlying the southern San Andreas fault in California could have affected rupture timing. A 1,000-year record of earthquakes and geological analysis indicate that high water levels on Lake Cahuilla increased stress on the rocks underneath, weakening faults and potentially leading to earlier ruptures.
Researchers investigate strata spanning critical intervals in Siberia to link eukaryotic evolution and Cambrian Explosion with deep-Earth processes. The study aims to provide insights into the coupled evolution of life and environment in Earth history.
A team of researchers has tracked a rare 'boomerang' earthquake in the ocean for the first time, revealing how it can cause devastating effects on land. The study used underwater seismometers to monitor the Romanche fracture zone and recorded a magnitude 7.1 earthquake with a unique reversing rupture mechanism.
Researchers found that early-formed rocky exoplanets are more likely to develop plate tectonics, a condition favorable to life emergence. This implies that life in the galaxy might have started earlier than previously thought, with planets formed later facing less chance of supporting life.
Researchers confirm three historic earthquakes on the San Andreas Fault in the Monterey Bay Area, occurring in 1838, 1890, and 1906, using a new model that accounts for charcoal inbuilt ages. The study uses a technique called wiggle matching to determine precise dates and recurrence intervals.
The study presents a comprehensive view of tectonic stresses acting on North America, offering regional clues about subsurface behavior. The findings have implications for understanding and mitigating induced seismicity, particularly in areas targeted for energy exploration.
Researchers found evidence of modern-like plate motion velocities at 3.2 Ga in rocks from the Honeyeater Basalt, pushing back the date for plate tectonics' onset. The discovery supports the theory that continuous uniform processes shaped Earth's crust.
A University of Iowa-led study found that Southern California earthquakes increased stress on the Garlock Fault, a major earthquake fault line. The research showed 'aseismic creep' along a 12- to 16-mile section of the fault, indicating it is sensitive to stress changes.
A new study of ancient rocks provides fresh insight into Earth's plate tectonics, which has evolved over the last 2.5 billion years. The findings challenge previous models suggesting plate tectonics operated throughout Earth's history.
A team of scientists used a microscopic drop of ancient seawater to show that plate tectonics on Earth began 3.3 billion years ago, 600 million years before the previous estimate. This discovery provides insight into the first stages of plate tectonics and the start of stable continental crust.
A new study published in the Bulletin of the Seismological Society of America has revealed signs of the 1906 San Francisco earthquake in a high-resolution map of the offshore northern San Andreas Fault. The map shows two large zones of slope failure on the seafloor, indicating that the fault ruptured in multiple strands.