Analysis of the Effects of Eurasian Crustal and Upper Mantle Structure on Regional Phases Using Broadband Seismic Data

1991 ◽  
Author(s):  
Susan Schwartz ◽  
Thorne Lay
Keyword(s):  
Upper Mantle ◽  
Seismic Data ◽  
Mantle Structure ◽  
Upper Mantle Structure ◽  
Regional Phases

Regional Sn velocities and shear velocity in the upper mantle

1973 ◽  
Vol 63 (2) ◽  
pp. 469-475
Author(s):  
Stephen Huestis ◽  
Peter Molnar ◽  
Jack Oliver
Keyword(s):  
Shear Wave ◽  
Western Australia ◽  
Upper Mantle ◽  
Seismic Data ◽  
Shear Velocity ◽  
Apparent Velocity ◽  
Mantle Structure ◽  
Uppermost Mantle ◽  
Seismic Shear ◽  
Upper Mantle Structure

abstract Determinations by various authors of the apparent velocity of the seismic shear wave Sn, which propagates in the uppermost mantle, are presented for several of the Earth's stable regions. Measurements of the velocity over two additional shield areas, India and Western Australia, were made and gave values of 4.72±0.03 km/sec and 4.75-4.87 km/sec, respectively. In general, the Sn velocity is greater than 4.7 km/sec. As the stable regions cover most of the Earth's surface and this velocity is representative of the shear velocity in the uppermost mantle, it is useful as a constraint in inversion of seismic data to determine upper-mantle structure.

CRUSTAL STRUCTURE ON THE EASTERN SEABOARD OF CANADA: STUDIES ON THE CONTINENTAL MARGIN

1966 ◽  
Vol 3 (1) ◽  
pp. 65-76 ◽  
Author(s):  
Charlotte Keen ◽  
B. D. Loncarevic
Keyword(s):  
Continental Shelf ◽  
Upper Mantle ◽  
Seismic Data ◽  
Seismic Refraction ◽  
Ocean Basin ◽  
Mantle Structure ◽  
Upper Mantle Structure ◽  
Gravity Measurements ◽  
Vertical Density ◽  
Eastern Seaboard

The results of several seismic refraction profiles on the continental shelf and slope of the eastern seaboard of Canada are now available. Gravity measurements which begin near the coast of Nova Scotia and end over the abyssal plain have also been made along two tracks perpendicular to the shelf edge. Various models for the crustal and upper mantle structure are presented. A density distribution assumed for each model resulted in a computed gravity field satisfying the observed gravity measurements. The models in agreement with all seismic data suggest that horizontal and vertical density variations occur in the upper mantle down to 100 km. The results indicate a mantle density of 3.42 g/cm3 under the continental shelf and 3.32 g/cm3 under the ocean basin.

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