Thermal regimes of major volcanic centers: Magnetotelluric constraints

Technical Report · Mon Oct 02 04:00:00 EDT 1989

DOI:https://doi.org/10.2172/5318442· OSTI ID:5318442

Hermance, J F

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.

• Research Organization: Brown Univ., Providence, RI (USA). Dept. of Geological Sciences
• Sponsoring Organization: DOE/ER
• DOE Contract Number: FG02-87ER13665
• OSTI ID: 5318442
• Report Number(s): DOE/ER/13665-1; ON: DE90003856
• Country of Publication: United States
• Language: English

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