Reproduction versus Recruitment of Swainson's Hawks in the Butte Valley, California

The Condor ◽  
2011 ◽  
Vol 113 (3) ◽  
pp. 547-554 ◽  
Author(s):  
Christopher W. Briggs ◽  
Michael W. Collopy ◽  
Brian Woodbridge
Keyword(s):  
Butte Valley

Environmental magnetic implications of Greigite (Fe3S4) Formation in a 3 m.y. lake sediment record from Butte Valley, northern California

1996 ◽  
Vol 23 (20) ◽  
pp. 2859-2862 ◽  
Author(s):  
Andrew P. Roberts ◽  
Richard L. Reynolds ◽  
Kenneth L. Verosub ◽  
David P. Adam
Keyword(s):  
Lake Sediment ◽  
Northern California ◽  
Sediment Record ◽  
Butte Valley

scholarly journals Lithologic description of a sediment core from Butte Valley, Siskiyou County, California

1994 ◽  
Author(s):  
David P. Adam ◽  
Hugh J. Rieck ◽  
M.L. McGann ◽  
K.H. Schiller ◽  
A. M. Sarna-Wojcicki ◽  
...  
Keyword(s):  
Sediment Core ◽  
Butte Valley

Apparent-magnetization mapping using entropic regularization

Geophysics ◽  
2010 ◽  
Vol 75 (2) ◽  
pp. L39-L50 ◽  
Author(s):  
João B. Silva ◽  
Suzan S. Vasconcelos ◽  
Valeria C. Barbosa
Keyword(s):  
Synthetic Data ◽  
Mapping Method ◽  
Magnetization Distribution ◽  
Zeroth Order ◽  
First Order ◽  
Smoothness Constraint ◽  
Entropic Regularization ◽  
The Common ◽  
Butte Valley ◽  
Constraint Method

A new apparent-magnetization mapping method on the horizontal plane combines minimization of first-order entropy with maximization of zeroth-order entropy of the estimated magnetization. The interpretation model is a grid of vertical, juxtaposed prisms in both horizontal directions. To estimate the magnetization of the prisms, assume that the top and bottom of the magnetic sources are horizontal. Minimization of the first-order entropy favors solutions with sharp borders, and the maximization of zeroth-order entropy prevents the tendency of the estimated source to become a single prism with large magnetization. Thus, a judicious combination of both constraints can lead to solutions characterized by regions with virtually constant magnetizations separated by sharp discontinuities. This is applied to synthetic data from simulated intrusive bodies in sediments that have horizontal tops. By comparing the results with those obtained with the common Tikhonov regularization (smoothness constraint) method, it is shown that both methods produce good and equivalent locations of the central positions of the sources. However, entropic regularization delineates the boundaries of the bodies with greater detail. Both the proposed and the smoothness constraints are applied to real anomaly data over a magnetic skarn in Butte Valley, Nevada, U.S.A. Entropic regularization produced an estimated magnetization distribution with sharper boundaries, smaller volume, and higher apparent magnetization as compared with results produced by incorporating the smoothness constraint.

scholarly journals Reply [to “Comment on ‘The Butte Valley and Layton Well thrusts of eastern California: Distribution and regional significance’”]

Tectonics ◽  
1997 ◽  
Vol 16 (1) ◽  
pp. 184-185
Author(s):  
Chester T. Wrucke ◽  
Calvin H. Stevens ◽  
Joseph L. Wooden
Keyword(s):  
Butte Valley
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