scholarly journals Geoelectric Upper Mantle Anomalies in the United States

1970 ◽  
Vol 22 (1-2) ◽  
pp. 91-95 ◽  
Author(s):  
T. MADDEN
Keyword(s):  
United States ◽  
Upper Mantle ◽  
The United States

scholarly journals P Wave Amplitude Decay Offers a Glimpse of Earth's Structure

Eos ◽  
2016 ◽  
Vol 97 ◽  
Author(s):  
Lily Strelich
Keyword(s):  
United States ◽  
Upper Mantle ◽  
Seismic Waves ◽  
Wave Amplitude ◽  
The United States ◽  
Deep Earthquake

Scientists look at deep earthquake signals to map how seismic waves lose energy in the upper mantle across the United States.

P-Wave Residuals in Western Canada

1975 ◽  
Vol 12 (2) ◽  
pp. 174-181
Author(s):  
E. J. Roebroek ◽  
E. Nyland
Keyword(s):  
United States ◽  
Wave Velocity ◽  
Upper Mantle ◽  
Velocity Structure ◽  
The United States ◽  
P Wave ◽  
Western Canada ◽  
Lateral Variation ◽  
P Wave Velocity ◽  
P Wave Velocity Structure

A study of over 1500 P-wave phases which pass, for the most part, through the upper mantle beneath Western Canada, shows that there is no significant lateral variation in P-wave velocity structure beneath Western Canada, and that the Wiggins and Helmberger model for the Western regions of the United States does not fit the data for Western Canada.One possible interpretation of the data for Western Canada is closer to the classical Herrin model of P-wave velocity as a function of depth than it is to the Wiggins and Helmberger A model.

Earthquake energy release and isostasy

1964 ◽  
Vol 54 (2) ◽  
pp. 777-784
Author(s):  
Joseph W. Berg ◽  
Robert Gaskell ◽  
Verrill Rinehart
Keyword(s):  
United States ◽  
Energy Release ◽  
Upper Mantle ◽  
West Indies ◽  
Averaging Method ◽  
The United States ◽  
Crust And Upper Mantle ◽  
Earthquake Energy ◽  
East Indies ◽  
The Relationship

ABSTRACT The relationship between isostatic anomalies and average annual earthquake energy released was investigated. Data were used for the United States, West Indies, East Indies, Japan, Africa, and India. The above areas were subdivided into smaller areas, 5° on the side, and the data for the smaller areas were used to determine a relationship between the variables. Because the data were considerably scattered, an averaging method was used for smoothing. Results of the research indicate that (1) a relationship exists between the average annual earthquake energy released from regions and the isostatic relief (or gradient) of the regions, and (2) the isostatic relief can be used as an index of the strain level of the crust and upper mantle.

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