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dc.contributor.authorMeier, Michaela
dc.contributor.authorSchlindwein, Vera
dc.contributor.authorScholz, John-Robert
dc.contributor.authorGeils, Jonah
dc.contributor.authorSchmidt-Aursch, Mechita C.
dc.contributor.authorKrüger, Frank
dc.contributor.authorCzuba, Wojciech
dc.contributor.authorJanik, Tomasz
dc.date.accessioned2021-09-02T10:51:26Z
dc.date.available2021-09-02T10:51:26Z
dc.date.issued2021
dc.identifier.citationGeochemistry, Geophysics, Geosystemsen_US
dc.identifier.otherDOI: 10.1029/2020GC009375
dc.identifier.urihttps://dspace.igf.edu.pl/xmlui/handle/123456789/43
dc.description.abstractUltraslow spreading ridges form the slowest divergent plate boundaries and exhibit distinct spreading processes in volcanically active magmatic sections and intervening amagmatic sections. Local seismicity studies of ultraslow spreading ridges until now cover only parts of segments and give insight into spreading processes at confined locations. Here, we present a microseismicity data set that allows to study spreading processes on the scale of entire segments. Our network of 26 ocean bottom seismometers covered around 160km along axis of the ultraslow spreading Knipovich Ridge in the Greenland Sea and recorded earthquakes for a period of about 1 year. We find seismicity varying distinctly along-axis. The maximum earthquake depths shallow over distances of 70km toward the Logachev volcanic center. Here, swarm activity occurs in an otherwise aseismic zone. Melts may thus be guided along the subparallel topography of the lithosphere-asthenosphere boundary toward major volcanic centers explaining the uneven along-axis melt distribution typical for ultraslow ridges. Absence of shallow seismicity in the upper 8km of the lithosphere with a band of deep seismicity underneath offsets presumably melt-poor regions from magma richer sections. Aseismic deformation in these regions may indicate weakening of mantle rocks by alteration. We do not find obvious indications for major detachment faulting that characterizes magma-poor spreading at some ultraslow spreading segments. The highly oblique spreading of Knipovich Ridge may be the reason for a fine-scale segmentation of the seismic activity with zones of weak seismicity possibly indicating transform motion on short obliquely oriented faults.en_US
dc.language.isoenen_US
dc.publisherAGUen_US
dc.relation.ispartofseries22;e2020GC009375
dc.titleSegment-Scale Seismicity of the Ultraslow Spreading Knipovich Ridgeen_US
dc.typeArticleen_US


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