11 research outputs found
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Thermal regimes of major volcanic centers: Magnetotelluric constraints
The interpretation of geophysical/electromagnetic field data has been used to study dynamical processes in the crust beneath three of the major tectono-volcanic features in North America: the Long Valley/Mono Craters Volcanic Complex in eastern California, the Cascades Volcanic Belt in Oregon, and the Rio Grande Rift in the area of Socorro, New Mexico. Primary accomplishments have been in the area of creating and implementing a variety of 2-D generalized inverse computer codes, and the application of these codes to fields studies on the basin structures and he deep thermal regimes of the above areas. In order to more fully explore the space of allowable models (i.e. those inverse solutions that fit the data equally well), several distinctly different approaches to the 2-D inverse problem have been developed: (1) an overdetermined block inversion; (2) an overdetermined spline inverstion; (3) a generalized underdetermined total inverse which allows one to tradeoff certain attributes of their model, such as minimum structure (flat models), roughness (smooth models), or length (small models). Moreover, we are exploring various approaches for evaluating the resolution model parameters for the above algorithms. 33 refs
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Application of natural electromagnetic field methods (magnetotellurics/geomagnetic variations) to exploring for energy resources: development of a broad-band data acquisition/processing facility. Topical report, May 1, 1979-April 30, 1980
Progress is summarized in the following fields: a review of the present state of knowledge of the deep thermal regimes associated with major rift systems of the world, field studies of several major tectonomagmatic systems, and design and testing of new magnetotelluric/geomagnetic variation field system for studying thermal regimes in the continental crust. (MHR