Plate boundary subduction zone earthquakes are important hazards for Puerto Rico. However, as demonstrated recently, shallow earthquakes on the microplate boundaries also present important earthquake and tsunami hazards. https://www.iris.edu/hq/inclass/animation/puerto_ricotectonics__earthquake_history | EarthScope Consortium
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The subduction of dense oceanic crust into the mantle plays an essential role in driving plate tectonics. However, the details of how new subduction zones form are poorly understood. In this model a section of buoyant oceanic crust arrives at a subduction trench and blocks it, causing the already-subducted slab to break off, and halting subduction. Then subduction starts in the opposite direction. The model shows not just a reversal, but how a new subduction can start, which is a matter of much
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Subduction zones show that there are 3 distinct areas of movement in the overlying plate: -constant movement above the locked leading edge, -see-saw pattern of back-&-forth movement -no movement far inland https://www.iris.edu/hq/inclass/animation/gps_records_variable_deformation_across_a_subduction_zone | EarthScope Consortium
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Recurrent reconnection events were observed under the IRIS slit. Solar jet like structures have been ejected from the reconnection sites and observed, in coordination with Solar Orbiter, energising the outer solar atmosphere, Credit: IRIS, LMSAL/NASA | IRIS - The Interface Region Imaging Spectrograph
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• IRIS • Large Solar Prominence - Interface Region Imaging Spectrograph 17.10.2020 • Here the multi-directional paths of the plasma show how chaotic the suns magnetic fields can get. The polarity of the magnetic loops dictate the flow of plasma in this short video taken by IRIS on Feb, 2015 over a duration of approximately 5 hours. The complex prominence shows vertical structures, rotating motions, and strong downflows from the prominence body. We aslo see a detailed view of the surface spicules
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V RewatchQuestion 88/10What happens at a subduction zone?... | Filo
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