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Sunday, May 10, 2020 | History

2 edition of Upper mantle structure beneath Southern Kenya from wide-angle data and its implications found in the catalog.

Upper mantle structure beneath Southern Kenya from wide-angle data and its implications

Glendon Byrne

Upper mantle structure beneath Southern Kenya from wide-angle data and its implications

by Glendon Byrne

  • 155 Want to read
  • 23 Currently reading

Published by University College Dublin in Dublin .
Written in English

    Subjects:
  • Seismology -- Kenya -- Data processing.,
  • Seismology -- Research -- Kenya.

  • Edition Notes

    Statementby Glendon F. Byrne.
    ContributionsUniversity College Dublin. Department of Geology.
    The Physical Object
    Paginationxxiii, 288p.p. :
    Number of Pages288
    ID Numbers
    Open LibraryOL17477838M

    subsequent inversions to solve for shear wave structure in the crust and upper mantle of southern Africa. A fast lithosphere lid is imaged beneath most parts of southern Africa. The lid thickness is estimated on the basis of the variation of shear wave velocity with depth and ranges from 80 km beneath the Namaqua-Natal belt to ± 20 km beneath. Upper mantle structure beneath the northern part of the East African Plateau using data from the NE Uganda temporary seismic network: Authors: Bressers, C. A.; obtain data for resolving structure under the northern part of the plateau as well as the East African rift in northern Kenya. Preliminary tomography models incorporate several.

      Refraction and wide angle reflection data [Sapin and Hirn, ] indicated an upper mantle P‐wave velocity of km/s beneath the Tethyan Himalaya in the region of our experiment; the data they used were taken along an approximately east‐west oriented line. Geophysical studies of lithosphere, crust, and upper mantle, based on heat flow, gravity, and seismic modeling and xenolith data. Database on the crustal structure in Europe, Siberia, and Southern Africa. Global databases on the LAB depth and crustal ages.

    Upper-mantle seismic structure in a region of incipient continental breakup: northern Ethiopian rift These global tomographic images show a low-velocity zone rising from the core—mantle boundary beneath southern Africa and impinging on the Afro-Arabian lithosphere in the Afar triple junction zone. These new tomographic images of upper. The upper mantle velocity is generally about km/s except beneath the rift where it is consistently low at - km/s. This anomalously low velocity suggests a 5 - 6% partial melt. The combined seismic and gravity model supports the contention that convective processes in the mantle are dynamically supporting the uplifted East African.


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Upper mantle structure beneath Southern Kenya from wide-angle data and its implications by Glendon Byrne Download PDF EPUB FB2

The uppermost mantle beneath the Kenya dome and relation to melting, rifting and uplift in East Africa Jacob, J. Mechie, and E. Dindi, Seismic structure of the upper mantle beneath the southern Kenya rift from wide-angle data, Tectonophysics,–, Cited by:   The uppermost mantle beneath the Kenya dome and relation to melting, rifting and uplift in East Africa Paul M.

Davis Department of Earth Cited by:   W right, C., K wadiba, M.T.O., K gaswane, E.M. and S imon, R.E. (), The structure of the crust and upper mantle to depths of km beneath the Kaapvaal craton, from P wave arrivals generated by regional earthquakes and mining-induced tremors, Journal of Cited by: 7.

A large number of velocity models derived from a variety of seismic data and using different seismic techniques have been published for the Archaean and Proterozoic shields. Here, we focus on the structure beneath southern Africa, where velocity models derived from most regional seismic data find the thickness of the seismic lithosphere to be less than km.

the origin of the upper-mantle anomaly is a clearer picture of its shape, both laterally and vertically. In response to this need, here we image the structure of the mantle transition zone beneath Kenya, and combine our im-ages with previously mapped mantle transition zone structure in Tanzania (Fig1).

To do this, we stackP-to-S converted. The seismic model is consistent with hot mantle material rising beneath the Kenya dome in the southern Kenya rift and north-dipping shearing along the rift axis near the base of the lithosphere.

The upper-mantle low-velocity anomaly beneath Ethiopia, Kenya, and Tanzania: Constraints on the origin of the African superswell in eastern Africa and plate versus plume models of mantle dynamics Andrew A.

Nyblade* Department of Geosciences, Pennsylvania State University, University Park, PennsylvaniaUSA ABSTRACT. Book Chapter Structure of the crust and upper mantle beneath the Parnaíba Basin, Brazil, from wide-angle reflection–refraction data Author(s) José E. Soares José E. Soares Instituto de Geociências, Campus Darcy Ribeiro, Universidade de Brasília, Brazil, The only feature recognizable more or less reliably is a low-velocity zone beneath the Siberian craton.

The ITS-derived upper mantle velocity structure is also compatible with inversion of P g, S g, P n, and S n data from the Baikal regional seismological network (Yakovlev et al., ).

Synthetic tests Chequerboard test. Mantle structure beneath the incipient Okavango rift zone in southern Africa Article in Geosphere 13(1):GES November with Reads How we measure 'reads'.

Upper mantle structure beneath southern Kenya from Wide-Angle data and its implications, (). Variation of electrical conductivity with depth by the magnetotelluric method. The African upper mantle and its relationship to tectonics and surface geology Article in Geophysical Journal International (3) - December with Reads How we measure 'reads'.

A major goal of the Kenya Rift International Seismic Project (KRISP) experiment was the determination of deep lithospheric structure. In the refraction/wide-angle reflection part of the KRISP effort, the experiment was designed to obtain arrivals to distances in excess of km.

Phases from interfaces within the mantle were recorded from many shotpoints, and by design, the best data were. However, reflected and refracted energy from mantle lithosphere are observed in both near-normal incidence and wide-angle data. The origin of the reflective structures is a matter of debate.

Our model shows a laterally continuous, low-velocity region in the upper mantle beneath all of eastern Africa and western Arabia, extending to depths of ~ – km, as well as a lower mantle anomaly beneath southern Africa that rises from the core-mantle boundary to at least ~ km depth and possibly connects to the upper mantle anomaly across the transition zone.

Instead, the low-velocity anomaly beneath the AARS can be explained by the African superplume model, where the anomalous upper mantle structure is a continuation of a large, thermo-chemical. The upper mantle structure beneath the Philippine Sea Plate has been extensively studied using surface waves (Kanamori and Abe,Oda and Senna, ).

Lebedev et al. (), and Nakamura and Shibutani () performed regional surface wave tomography to obtain 3-D shear wave speed structure models beneath the Philippine Sea.

This study presents preliminary results of the upper mantle structure beneath the east Africa from body wave tomography.

This work is part of an on-going study aimed at investigating the origin and structure of the African Superplume. The available global tomographic studies suggest that the African Superplume is a low velocity-anomaly extending from the core-mantle boundary upward into the.

Seismic structure of the uppermost mantle beneath the Kdnya rift The seismic model is consistent with hot mantle material rising beneaith the Kenya dome in the southern Kenya rift and north-dipping shearing along the rift axis near the base of the lithosphere Index map of the Kenya rift showing shotpoints which produced data on upper.

The S wavespeed structure below the km discontinuity and throughout the transition zone and below to km depths for the region beneath southern Africa and surrounding oceans generally shows similar characteristics to the P wavespeed distribution Fig.

3, Fig. The major difference is the evidence for the LWZ around km depth overlain. This study builds on these initial interpretations of the NIGHT data set (Stratford & Stern ) and, using additional data, reinterprets the fine structure of the crust—mantle transition zone and mantle beneath the CVR, and the crustal structure of the central North Island.

In particular, we present new long-range refraction data, with.The formation of Archean crust appears to involve processes unique to early earth history. Initial results from receiver function analysis of crustal structure beneath 81 broadband stations deployed across southern Africa reveal significant differences in the nature of the crust and the crust‐mantle boundary between Archean and post‐Archean geologic terranes.Beneath the margin wedge the strong plate boundary reflection is shown in the MCS data as well as on some wide-angle records (see phase PbP from these station records, Figs 6 and 8).

Negative polarity reflections indicate the presence of the fluids at the plate boundary in Costa Rica (Ranero et al. ) and are related to the LVZ.