Oceanic crustal structure--Mid-Atlantic Ridge at 45 N
نویسندگان
چکیده
منابع مشابه
Shear wave splitting and crustal anisotropy at the Mid-Atlantic Ridge, 35 N
[1] Shear wave splitting observed in microearthquake data at the axis of the Mid-Atlantic Ridge near 35 N has a fast polarization direction that is parallel to the trend of the axial valley. The time delays between fast and slow S wave arrivals range from 35 to 180 ms, with an average of 90 ms, and show no relationship with ray path length, source-toreceiver azimuth, or receiver location. The a...
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Microbial community structure in natural environments has remained largely unexplored yet is generally considered to be complex. It is shown here that in a Mid-Atlantic Ridge hydrothermal vent habitat, where food webs depend on prokaryotic primary production, the surface microbial community consists largely of only one bacterial phylogenetic type (phylotype) as indicated by the dominance ofa si...
متن کاملCrustal Thickness on the Mid-Atlantic Ridge: Bull's-Eye Gravity Anomalies and Focused Accretion.
Spreading segments of the Mid-Atlantic Ridge show negative bull's-eye anomalies in the mantle Bouguer gravity field. Seismic refraction results from 33 degrees S indicate that these anomalies can be accounted for by variations in crustal thickness along a segment. The crust is thicker in the center and thinner at the end of the spreading segment, and these changes are attributable to variations...
متن کاملThree-dimensional seismic structure of the Mid-Atlantic Ridge (35!N): Evidence for focused melt supply and lower crustal dike injection
[1] We gathered seismic refraction and wide-angle reflection data from several active source experiments that occurred along the Mid-Atlantic Ridge near 35!N and constructed three-dimensional anisotropic tomographic images of the crust and upper mantle velocity structure and crustal thickness. The tomographic images reveal anomalously thick crust (8–9 km) and a low-velocity ‘‘bull’s-eye’’, from...
متن کاملEvaluating Goce Data near a Mid-ocean Ridge and Possible Application to Crustal Structure in Scandinavia
GOCE gravity fields are assessed in an area around Reykjanes Ridge. Ship gravity measurements were found to be to inaccurate to determine possible improvement of GOCE gravity field models compared to the best available GRACE gravity field model. Differences between the GOCE gravity field models and EGM2008 does not appear to contain a component of the mid-ocean ridge signal. However the differe...
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ژورنال
عنوان ژورنال: Geophysical Journal International
سال: 1979
ISSN: 0956-540X,1365-246X
DOI: 10.1111/j.1365-246x.1979.tb04777.x