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In previous isostatic computations, the isostatic reduction of gravity data is made using an isostatic response function (the response of the earth's gravity field to a concentrated load on the earth's surface) derived for an assumed mechanism of compensation. In this report a method is given for the computation of this function directly from observational data, eliminating the need for assuming a compensation mechanism. (Author).
Clark and Ringwood (1964) in discussing the petrological-physical properties of the upper mantle concluded that isostatic compensation was not complete until 400 km. These new facts require a re-evaluation of the gravity data from an isostatic standpoint. Dorman and Lewis (Paper I), using a communication theory approach, have discussed the theory for obtaining the earth's response to a unit load, and hence under certain assumptions, the isostatic mechanism, from the data itself. It is the purpose of this paper to apply this method to data in the U.S.A., using numerical analysis techniques which appear heretofore to have bypassed the subject of isostasy, in an attempt to further refine our knowledge of the isostatic processes. In addition the general application of these techniques to the analysis of two dimensional gravity fields and the specific application to the problem of gravity prediction will be discussed. (Author).
This is a discount Black and white version. Some images may be unclear, please see BCCampus website for the digital version.This book was born out of a 2014 meeting of earth science educators representing most of the universities and colleges in British Columbia, and nurtured by a widely shared frustration that many students are not thriving in courses because textbooks have become too expensive for them to buy. But the real inspiration comes from a fascination for the spectacular geology of western Canada and the many decades that the author spent exploring this region along with colleagues, students, family, and friends. My goal has been to provide an accessible and comprehensive guide to the important topics of geology, richly illustrated with examples from western Canada. Although this text is intended to complement a typical first-year course in physical geology, its contents could be applied to numerous other related courses.
1. What is geophysics? -- 2. Planet Earth -- 3. Seismology and the Earth's internal structure -- 4. Siesmicity--the restless Earth -- 5. Gravity and the figure of the Earth -- 6. The Earth's heat -- 7. The Earth's magnetic field -- 8. Afterthoughts
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