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Showing 1 to 20 of 160 for “"subduction zone"”.
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Advances in Subduction Zone Processes
Subduction zones are an important recycling center at which material from the exterior of the Earth is transported to Earth's interior. The processes that occur along subduction zones have important implications for elemental cycles, geodynamics, and material mass transport. The cold, dense …
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Subduction zone wave guides : deciphering slab structure using intraslab seismicity at the Chile-Peru subduction zone
Subduction zones are regions of intense earthquake activity up to great depth. Sources are located inside the subducting lithosphere and, as a consequence, seismic radiation from subduction zone earthquakes is strongly affected by the interior slab structure. The wave field of these intraslab …
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Liquefaction Triggering Model for Subduction Zone Earthquakes
… inaccurate results for megathrust earthquakes in subduction interfaces. To overcome this drawback and to achieve better prediction of liquefaction cases in subduction zones, this research intends to develop new empirical models that could be used for the prediction of liquefaction triggering in …
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Imaging of the Hellenic subduction zone by seismic tomography
The Hellenic subduction zone is a complicated tectonic boundary, along which transitions in the nature of subducted material are believed to occur. The objective of this study was to better constrain the subsurface geometry of the Hellenic subduction zone by increasing the resolution of an existing …
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Seismic Constraints on Slow Slip Events within the Cascadia Subduction Zone
… of geodetic GPS time series from the Cascadia subduction zone have revealed at least 30 resolvable slow slip events along the megathrust, ranging from northern California to southern British Columbia, since 1997. Many of the smaller and more recent events are barely resolvable with GPS, but …
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Impact of Cascadia Subduction Zone Earthquakes on Coastal Bridges in Washington State
The Cascadia Subduction Zone in the Pacific Northwest means is likely to generate a magnitude 9 earthquake in the future. A set of 30 synthetic (physics-based) ground motions were created by researchers from the University of Washington and United States Geological Survey. Using an existing …
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The Thermal and Fluid Environment of the Cascadia Subduction Zone, Southern Washington State
Subduction zones are areas of tectonic plate collision that produce associated earthquakes and destructive tsunamis and, in addition, provide a link between the atmosphere and ocean. Mapping the thermal and fluid circulation of an active subduction zone can advance our understanding of subduction …
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Quantifying coseismic land-level change along the Cascadia subduction zone in central Oregon
Understanding the behavior of past Cascadia Subduction Zone (CSZ) megathrust earthquakes is crucial for assessing rupture dynamics and predicting future seismic hazards. Estimates of the magnitude of coseismic subsidence produced by these great (>M 8.5) earthquakes provide critical constraints for …
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Modeling of Potential Historical Tsunamis from Large Earthquakes in the Izu-Bonin Mariana Subduction Zone
<p>The Izu-Bonin Mariana (IBM) subduction zone is an over 3000-km long oceanic-oceanic convergence zone with no instrumental record of great subduction-zone earthquakes (M<sub>w</sub> > 8.0). Due to the lack of great earthquakes and the oceanic-oceanic subduction style, previous researchers have …
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Studying subduction zone dynamics and continental evolution in South America using data-oriented geodynamic models
… evolution. This continent possesses the longest subduction zone, the second highest continental plateau and tremendous amounts of volcanic eruption on its western coast. On the eastern coast, the Brazilian highlands that reach more than 1 km above the sea level were once submerged by shallow …
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The South Chilean subduction zone between 41° and 43.5°S : seismicity, structure and state of stress
Die stärksten Erdbeben treten an Subduktionszonen auf, so z.B. das stärkste instrumentell jemals gemessene Erdbeben vom 22. Mai 1960 mit einer Magnitude von 9,5 Mw in Süd Chile. In dieser Arbeit werden lokal gewonnene seismologische Daten aus dem zentralen Bereich des 1960er-Bebens vorgestellt. Das …
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Carbon in Silicate Melt - Experimental Constraints and Applications for the Subduction Zone and Magma Ocean Carbon Cycles
… rhyolitic melts. These studies are applicable to subduction zone settings of the Earth throughout its history. Carbon concentrations and speciation were measured using FTIR, and in the process, we determined absorption coefficients for the CO2 species (CO2mol. and CO32-) for natural rhyolitic …
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Decoding Seismic Hazard Enigmas via Next-Generation Paleoseismic Analyses: With Application to the Cascadia Subduction Zone and Beyond
… database and liquefaction in an Mw9 Cascadia Subduction Zone (CSZ) event is forecasted regionally using 30 different physics-based ground motion realizations and a first-order geospatial liquefaction model. These products are (6) made available as an online database so that others may study, …
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INTEGRATING GEOPHYSICAL METHODS TO STUDY SUBDUCTION ZONE PROPERTIES, ACTIVE FAULTING IN A VOLCANIC FIELD, AND VOLCANO LANDSLIDE HAZARDS
… data to study the upper crustal structure of subduction zones and its influence on earthquake, volcanic, and landslide hazards from the trench to the volcanic arc. Specifically, I use seismic reflection data, earthquake focal mechanisms, magnetics, and electromagnetics to study three actively …
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Energy Budget Analysis of Slow-Slip Tremor Events Along the Cascadia Subduction Zone Using Continuous GPS Array Data
<p>Seismic hazards poised to cities by subduction zones are strongly controlled by fault slip along the deeper extent of the two plate interaction closest to population densities. In Cascadia, where Mw=9 size events are known to occur from a variety of sources, modeling of leveling data has …
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Seismic imaging of the western Hellenic subduction zone : the relationship between slab composition, retreat rate, and overriding lithosphere genesis
… structure and dynamics of the Western Hellenic Subduction Zone (WHSZ) by using two complementary seismic imaging methods and interpreting the resulting images with models that describe the dynamics of retreating subduction. First, I produce high-resolution seismic images across northern and …
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The thermal evolution of subduction zone lithosphere: Evidence from the chemical development of Mt. Ruapehu and surrounding vents, New Zealand.
… the southwest termination of the Taupo Volcanic Zone (TVZ) in the North Island of New Zealand where the Pacific Plate subducts beneath the Australian Plate. Volcanism has migrated south with time as rifting from the Kermadec arc has propagated into the North Island lithosphere making Ruapehu the …
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Documenting the Origin of Compositional Diversity of Subduction Zone Magmatism, Alicudi, Aeolian Arc (Southern Tyrrhenian Sea, Italy) Using in situ Plagioclase Data
<p>Processes that generate magma compositional diversity are important to document because composition affects degree of explosivity, which impacts hazard mitigation. Magnesium to silicon rich magmas are produced by processes such as magma recharge, assimilation, and fractional crystallization …
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Tectonostratigraphic evolution of the Sinu accretionary prism and Lower Magdalena forearc basin formed above a shallow-dipping subduction zone, Caribbean margin of Colombia
… I define an east-southeastward (110˚) dipping zone of shallow subduction beneath northwestern Colombia, an actively deforming accretionary prism, and an Oligocene to Recent forearc basin. Low angle subduction occurs as a 13-16 km thick Late Cretaceous oceanic plateau subducts beneath South …
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Diatom-based reconstructions of earthquake-induced paleoenvironmental change in coastal Alaska and Washington, USA
… historical (written and oral) records along most subduction zone coastlines often leading to the underestimation of magnitude, recurrence, and spatial extent of these events. Paleoseismic studies target low energy depositional environments that record primary and secondary evidence of earthquake …
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