Articles tagged with Subduction
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Researchers used 3D models of Cascadia megathrust events and geological evidence to recreate the 1700 earthquake's impact on the Pacific Northwest coast. The study suggests that a rupture extending just offshore could cause coastal subsidence, with an estimated magnitude between 8.7 and 9.2.
Researchers have developed a new method to study rocks along fault lines, revealing clearer views of the Earth's crust. This technique combines acoustic mapping with full waveform inversion, enabling scientists to better understand why earthquakes and tsunamis occur.
Researchers analyzed past major earthquakes in Mexico and Chile to understand earthquake cycles and calculate future seismic hazards. The data also helped develop new ideas about the physical processes involved in seismic rupture, geometry of subduction, and tsunami generation in the region.
Researchers found 'switches' between continental rupture, collision, and oceanic subduction initiation in the Tethyan evolution. Oceanic slabs drove continental fragments into their final positions, controlling supercontinent assembly and breakup cycles.
This study reveals complex deformation and metamorphism processes, melt/fluid interactions with crust-mantle rocks, and material circulation in subduction zones. Crust-mantle physical interactions control geometry, tectonic associations, and chemical interaction in orogen and mantle wedge.
A groundbreaking study reveals that microbes in subduction zones consume and trap carbon, reducing its availability on Earth's surface. This process has significant implications for understanding Earth's fundamental processes and the potential to mitigate climate change.
Researchers found that microbes consume and trap carbon sinking into the trench off Costa Rica's Pacific coast, potentially influencing geological processes on similar scales as volcanoes. This discovery has important implications for understanding carbon movement from Earth's surface into its interior over geological timescales.
Researchers developed a new method to investigate tectonic C cycling in the complex Sunda margin, finding that only a fraction of sedimentary carbon returns to the Earth, contributing to atmospheric CO2. This discovery has significant implications for understanding the solid Earth's role in regulating global climate.
Researchers used hourly water level records from tide gauges to detect episodic tremor and slip patterns in the Cascadia Subduction Zone. The study found that these events occurred every 14.6 months between 1996 and 2011, but not during the pre-GPS era, suggesting a potential change in the pattern over time.
Researchers have reconstructed ancient lost plates under the Andes mountains, offering a glimpse of the Earth's surface millions of years ago. The study reveals that the formation of the mountain range was more complex than previously thought, with evidence of volcanic activity and plate tectonics.
A study at Oregon State University found that 'silent slip' - a brief episode of shallow mantle creep and seismic swarms - occurs before large earthquakes. The research deployed seismometers on the ocean bottom to detect over 1,600 earthquakes at the Blanco Ridge fault.
Researchers applied machine learning to analyze Cascadia data, discovering a constant tremor that predicts slow slippage and fault failure. The study found a direct parallel between the loudness of the signal and the physical changes, allowing for more accurate predictions of megaquakes.
A seismic study spanning the Mariana Trench reveals that subduction zones drag about three times more water into the deep Earth than previously estimated. The observations highlight the important role of subduction zones in the global water cycle, with implications for our understanding of the Earth's interior.
A new study by University of Texas at Austin researchers links sediment movement to continental drift speed, suggesting a key role for feedback mechanisms. The findings challenge existing ideas on plate interaction and may explain variations in plate speeds, such as India's rapid northward acceleration.
A new seismic study reveals that subduction zones drag about three times more water down into the deep Earth than previously estimated. The observations from the Mariana Trench have important implications for the global water cycle, suggesting that much of the Earth's water is being recycled through volcanic activity.
Researchers at Rice University have discovered a link between tiny tremors on the Cascadia margin and fluid activity deep within the Earth's crust. The study reveals that these small quakes are related to slippage in the subducting plate, which releases fluids into sediments trapped beneath the overriding plate.
Researchers found a deep, rupturing subduction zone earthquake that defies existing models, indicating the need for reevaluation of hazard maps and building codes. The study suggests seawater infiltration may have accelerated cooling in the Cocos plate, making it susceptible to tension earthquakes.
The Jiachala Formation, a key deposit in the Neo-Tethyan subduction zone, was formed in a submarine fan environment during Late Cretaceous (~88-84 Ma) at the active southern margin of the Asian plate. Provenance analysis indicates it originated from the Gangdese arc and central Lhasa terrane.
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 confirm connection between plate tectonics, mantle flow and magnetic field reversals, suggesting a 120-130 million year delay. This finding provides new insights into the interaction between Earth's crust, mantle and core.
Researchers identify five types of growth strata developed in different structures, suggesting a 'pair' of basement-involved fold-thrust belt and flexure basin controlled by flat subduction. Sediments record the history of the Yanshanian Movement and provide key evidence for tectonic property of Northeast continental margin.
Haiying Gao will study five subduction zones across the globe to characterize differences and similarities in large earthquakes. Her advanced modeling techniques will rely on sensor data from land-based and deep-ocean seismic stations.
Researchers used eyewitness accounts from 2014 and 2016 to reconstruct the 1946 tsunami's heights and distances, challenging previous estimates. The study found tsunami heights over five meters and flooded areas of up to 600 meters inland.
The subduction of the Pacific plate resulted in the thinning and replacement of the lithospheric mantle in the North China Craton. The Yanshan Movement, a decratonization process, was characterized by lithospheric thinning and crustal detachment triggered by asthenospheric upwelling.
Research shows that water-bearing minerals release water underneath geologic hot spots, lubricating earthquakes and fueling volcanoes. A new spectroscopy technique applied to garnet containing fragments of quartz reveals the source of water, contradicting conventional thermodynamic equations.
Researchers identified a bending fault line in the Pacific Ocean as the likely cause of the 7.1 magnitude Puebla earthquake, which caused significant damage in Mexico City. The study suggests that earthquakes like this one may be more common than previously thought in a region southeast of Mexico City.
A mission is underway to lower sub-seafloor observatories into the Hikurangi subduction zone off New Zealand. This expedition aims to understand why destructive tsunamis occur after shallow earthquakes and underwater landslides, shedding light on New Zealand's largest earthquake and tsunami hazard.
A team of scientists, led by Penn State's Demian Saffer and Laura Wallace, is installing observatories beneath the sea floor to study slow earthquakes. They aim to uncover links between slow earthquakes, large normal earthquakes, and tsunami generation risk.
Researchers have obtained detailed three-dimensional images of a megathrust fault west of Costa Rica, revealing long grooves and other features that may control how the fault slips in an earthquake. The study provides unprecedented insight into the mechanisms at work along these faults, critical for disaster management worldwide.
The September 2017 earthquakes showcased the effectiveness of Mexico's SASMEX early warning system, which detected the magnitude 8.2 Tehuantepec earthquake and sent alerts to residents with almost two minutes' notice. However, improvements are needed to reduce processing times and ensure timely warnings for all residents.
Researchers from GEOMAR and Universidad de Chile found that the 2016 earthquake released accumulated energy from a previous quake in 1960, with a slip of over 4.5 meters. This study suggests reevaluating seismic cycles for risk assessment and construction recommendations
The Andes were formed due to the South American subduction zone, where an oceanic plate sinks into the Earth's mantle, causing crustal shortening and mountain building. The subduction zone's size and depth led to large-scale flow in the deep mantle, resulting in the continent's westward drag and collision with the subduction zone.
A study by University of Texas at Austin researchers found that compact sediments along the Cascadia Subduction Zone increase earthquake and tsunami hazards. Compact sediments offshore of Washington and northern Oregon can lead to more stress buildup and longer rupture distances, making them prone to triggering larger tsunamis.
High-pressure X-ray measurements reveal the formation of a new phase of kaolinite, a clay mineral containing aluminium, under conditions similar to those in subduction zones. The super-hydrated phase contains more water than any other known aluminosilicate mineral in the mantle.
A team of researchers from LMU and TUM used supercomputing resources to simulate a massive earthquake with 1,500km of non-linear fracture mechanics, achieving a 13-fold improvement in time to solution. The simulation helped understand the complex process behind megathrust earthquakes, which can unleash violent tsunamis.
Researchers at Kyushu University have identified a strong influence of pre-existing faults on earthquake location and behavior in the Nankai Trough offshore Japan. The study found that aftershocks only occurred in front of an ancient accretionary prism, where stress accumulation is greatest.
High-precision age dates reveal that Siletzia was built near Bremerton and its collision with North America led to a jammed subduction zone, causing tectonic ripple effects. The study provides new insights into the Pacific Northwest's evolution.
Researchers simulated 50 scenarios of a magnitude-9.0 Cascadia earthquake, finding that coastal areas would be hardest hit and locations in sediment-filled basins like Seattle would shake more. The intensity of shaking can vary by a factor of 10 depending on the scenario.
Researchers used instrumented nanoindentation to measure olivine's strength, finding it weaker with larger diamond tips. The study resolves a long-standing debate on the mineral's strength and has implications for understanding plate tectonics and volcanic activity.
Scientists have documented a clear-cut instance of a massive earthquake triggering slow slip events in New Zealand, some occurring as far away as 300 miles from the epicenter. This study provides new insights into the relationships between slow slip events and earthquakes.
Researchers will drill into the seafloor of Zealandia, examining a shift in plate movement that occurred 50 million years ago. The expedition aims to understand the timing and causes of this change, which led to the development of new volcanoes and changes in ocean circulation patterns.
A global data set reveals that volcanic arcs mobilize carbon from crustal carbonate platforms, particularly in Italy and Indonesia. This finding requires a downward revision of past organic carbon burial estimates.
Researchers found near-continuous tremor activity and 1,300 low-frequency earthquakes in the region, suggesting a connection to damaging earthquakes. The study used a novel 'beam back projection' method to track slow earthquakes minute-by-minute, revealing clusters of tremor sources with distinct properties.
Researchers found that 50% of energy is released in slow earthquakes, reducing tsunami risk, but the exact mechanism remains unclear. The study used data from instruments placed on the seafloor and in boreholes east of Japan's coast to understand slow-slip earthquakes and their impact on large earthquakes and tsunamis.
Researchers studying slow-slip earthquakes on the seafloor off Japan's coast have gained new insights into undersea earthquakes and tsunami creation. About 50% of energy released during these events can be dissipated, potentially reducing tsunami risk.
A team of scientists found that dehydration of minerals deep below the ocean floor influenced the severity of the 2004 Sumatra earthquake. The researchers used ocean drilling samples to understand the process and its potential impact on other subduction zones.
Research published in Science journal found that sediment warming contributed to the severity of the 2004 Sumatra earthquake and tsunami, killing over 250,000 people. The study suggests a similar mechanism could be at play in other subduction zones worldwide.
Researchers propose a new model for the initial India-Eurasia continental collision, which led to the formation of the Tibetan Plateau. The model suggests an earlier collision timing between 65 Ma and 63 Ma, resulting in large-scale continental subduction and deformation across central Asia.
Researchers discovered a previously unknown process involving the melting of intensely-mixed metamorphic rocks, known as mélange rocks, that form through high stress during subduction. This finding changes our understanding of how volcanic arc lavas are formed and may have implications for earthquake studies and volcanic eruption risks.
A global scientific team has uncovered significant information about the early stages of subduction in the Pacific Ring of Fire. Analysis of a drill core from 2014 provides evidence that volcanism began around 30-40 million years ago, with explosive stratovolcanoes forming later.
An international team of researchers published seafloor maps revealing current activity at a plate boundary off Sicily and Calabria. The study provides new insights into the geological processes in the region, which has been hit by devastating earthquakes and tsunamis in the past.
Scientists discovered a seismic belt in the downgoing slab of the Pacific Plate, triggered by the sudden release of water due to temperature changes. The findings suggest that earthquakes occur when the mantle releases its water, which is correlated with the subduction rate and slab temperature.
Researchers found that very large earthquakes occur on flat fault areas, suggesting a link between fault curvature and megaquake risk. The study's findings support the idea that curvy faults are less likely to experience massive earthquakes.
Researchers found that a divergent plate boundary can be forced to converge, leading to the formation of a new subduction zone. The study suggests that buoyant but weak plate material at a divergent boundary can resist subduction, but eventually gives way to denser older material, creating a self-sustaining subduction zone.
Researchers found variable boron isotope ratios in ancient igneous rocks, suggesting changing carbon sources in the mantle over geological time. The study provides insights into crustal formation and tectonic plate movement, potentially dating back several billion years.
A new initiative aims to analyze ancient Alpine rocks for insight into the forces governing activity beneath the crust. Researchers will investigate thorium and uranium decay to lead in the subsurface, improving understanding of Earth's evolution and subduction processes.
The collaboration aims to refine national seismic hazard models by sharing expertise and research topics. The focus section discusses different modeling approaches and primary audiences, providing insights into the consequences of similar megathrust earthquakes in each region.
A new mechanism explains how great earthquakes cause coastal uplift worldwide, highlighting the potential for future damaging earthquakes and tsunamis at active subduction margins. Paleoshorelines reveal that recent uplift is often greatest in periods with clustered large-magnitude earthquakes.
A new analysis reveals that massive earthquakes on the Cascadia Subduction Zone, affecting population centers like Portland and Seattle, may occur more frequently than thought. The study used detailed data from core samples and found slightly higher chances of an earthquake within the next 50 years.
Researchers found that calcareous sediments, not clay-rich sediments, are the most likely candidates for the first breakage of an earthquake. The study suggests that these sediments form a weak point in the rock sequence, leading to shallow earthquakes and tsunamis.