scholarly journals Three-dimensional modelling of upper mantle structure under the Pacific Ocean and surrounding area

1989 ◽  
Vol 98 (2) ◽  
pp. 255-269 ◽  
Author(s):  
Yu Shen Zhang ◽  
Toshiro Tanimoto
Keyword(s):  
Pacific Ocean ◽  
Upper Mantle ◽  
Three Dimensional ◽  
Mantle Structure ◽  
Surrounding Area ◽  
The Pacific ◽  
Upper Mantle Structure ◽  
The Pacific Ocean

Variations of Upper Mantle Structure under the Pacific Ocean

Science ◽  
1974 ◽  
Vol 186 (4159) ◽  
pp. 141-143 ◽  
Author(s):  
A. R. Leeds ◽  
L. Knopoff ◽  
E. G. Kausel
Keyword(s):  
Pacific Ocean ◽  
Upper Mantle ◽  
Mantle Structure ◽  
The Pacific ◽  
Upper Mantle Structure ◽  
The Pacific Ocean

Crustal structure of Pacific Ocean area from dispersion of Rayleigh waves

1963 ◽  
Vol 53 (1) ◽  
pp. 151-165
Author(s):  
Tetsuo A. Santô ◽  
Markus Båth
Keyword(s):  
Pacific Ocean ◽  
Upper Mantle ◽  
Rayleigh Waves ◽  
High Heat ◽  
The Pacific ◽  
New Type ◽  
The Pacific Ocean ◽  
Thin Crust ◽  
Oceanic Structure ◽  
Ridge System

Abstract The dispersion of Rayleigh waves along a great number of Pacific paths has been studied by means of records from Pasadena, California, U. S. A., and Huancayo, Peru. Combining these measurements with previous ones based on records at Tsukuba, Hongkong, Honolulu and Suva, it was found that the central part of the Pacific Ocean exhibits the most oceanic structure, with exception for the Hawaiian Islands. In the south-eastern Pacific Ocean an area could be delineated with a new type of dispersion characteristics, not found in any other part of the Pacific. This area agrees closely with the Easter Island Ridge system, and exhibits unusually thin crust and low upper-mantle velocities as well as exceptionally high heat flow.

Upper Mantle Structure beneath the Mid-Atlantic Ridge from Regional Waveform Modeling

2020 ◽  
Vol 110 (1) ◽  
pp. 18-25 ◽  
Author(s):  
Ingo Grevemeyer
Keyword(s):  
Upper Mantle ◽  
Velocity Structure ◽  
Vertical Component ◽  
Depth Interval ◽  
Mantle Structure ◽  
Waveform Modeling ◽  
Spreading Ridges ◽  
The Pacific ◽  
Upper Mantle Structure ◽  
Mid Atlantic Ridge

ABSTRACT The lithosphere is the outermost rigid layer of the Earth and includes the crust and brittle uppermost mantle. Because the poor seismic coverage of the ocean basins is the mantle structure of young lithosphere below midocean spreading centers poorly constrained, especially along slow spreading ridges. Surface waves radiated by midocean ridge earthquakes are excellent agents to study young lithosphere when being recorded in the vicinity of the ridge crest. Here, we use body and Rayleigh waves from six central Atlantic transform fault earthquakes with magnitude Mw>6 to constrain upper mantle structure away from ocean islands. Earthquakes were recorded by a network of broadband ocean-bottom seismometers deployed at the Mid-Atlantic Ridge (MAR) near 14°45′ N. Waveform modeling of vertical-component data at periods of 10–60 s yielded the velocity structure of the uppermost ∼100  km of the mantle and hence of the depth interval where lithospheric cooling is most evident. The data support that both S-wave velocity of the lithospheric lid and its thickness increases with age; velocities increase from 4.35 to 4.75  km/s and thickness from 30–50 to 70 km, sampling mantle with an average path age of ∼7 and 18 My, respectively. With respect to constraints found previously in the Pacific, lid velocities beneath the MAR are faster than beneath fast-spreading ridges, whereas asthenospheric velocities are similar to the Pacific. The fast velocity of the lid and slow velocity of the inversion zone may indicate effective hydrothermal cooling of the lithosphere.

scholarly journals Variations in the electrical conductivity of the upper mantle beneath North America and the Pacific Ocean

2000 ◽  
Vol 105 (B4) ◽  
pp. 8229-8242 ◽  
Author(s):  
Scott L. Neal ◽  
Randall L. Mackie ◽  
Jimmy C. Larsen ◽  
Adam Schultz
Keyword(s):  
Electrical Conductivity ◽  
Pacific Ocean ◽  
North America ◽  
Upper Mantle ◽  
The Pacific ◽  
The Pacific Ocean
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