Interpretation of the Alert Anomaly in Geomagnetic Variations.
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Interpretation of the Alert Anomaly in Geomagnetic Variations.

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Published by s.n in S.l .
Written in English

Book details:

Edition Notes


SeriesCanada Dominion Observatory Contributions -- V.6,no.04
ContributionsRikitake, T., Whitham, K.
ID Numbers
Open LibraryOL21904169M

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Magnetic variations measured at three stations across the strike of the anomaly in electrical conductivity of the earth's mantle suggested by Whitham and Andersen () near Alert, Ellesmere Island, have been analyzed by simple potential by: Overview. Magnetic interpretation, as in gravity interpretation, operates at several levels of complexity. It can range from simple identification and location of anomalous magnetic bodies in the subsurface to three-dimensional modeling leading to complete characterization of anomaly by: 1.   The smaller scale array disclosed details in the regional pattern for which interpretation proceeds in terms of current concentration in an equivalent current sheet. A geomagnetic variation anomaly in the Northern Pyrenees, Dyck. A. V. Garland. G. D., A conductivity model for certain features of the Alert anomaly in geomagnetic Cited by: Magnetic anomalies for interpretational purposes are commonly transformed into the equivalent anomaly that would be observed at the geomagnetic pole. This reduction-to-the pole shifts the anomaly to a position directly over the source and increases the anomaly's symmetry, simplifying the magnetic interpretation.

Geomagnetic field variations in time and space provide important information about the state of the solid Earth, as well as the solar-terrestrial relationships and space weather conditions. The monograph presents a set of fundamental and, at the same time, urgent scientific problems of modern geomagnetic studies, as well as describes the. has been demonstratedfor the North American Central Plains anomaly. 1. Introduction 2. Methods of observation and interpretation Inrecent years many studies have been made with Classical geomagnetic deepsounding (G.D.S.) linear or two-dimensionalarrays ofthree-component methodswere developed, largely by Schmucker( A magnetic-based geophysical study was performed across the southern part of Cameroon to investigate the boundary between the Archean Congo craton and the Pan-African metamorphic belt. Magnetic gradient techniques including Euler deconvolution and Tilt derivative have been applied to an aeromagnetic data profile to determine the depth of sources and their lateral extension. D magnetic.   One such anomaly is in the Central African Republic. If you use a magnetic compass while standing over the Bangui Magnetic Anomaly, it will wig out due to the huge magnetic field.

A survey with temporary geomagnetic field stations (Askania Variographs) has been conducted in the southwestern United States in order to study local differences of geomagnetic variations. Anomalous large Z -variations, accompanied with a slight reduction of the variations in D and H, have been recorded along the California coastline for long. The mid-depth models are potentially a better estimate of the main geomagnetic polarity history (M. Tominaga, pers. comm. to J. Ogg, May ), hence geophysical models for both interpretations of these pre-M25r deep-tow magnetic anomaly profiles have been published (e.g., Figure 11 in Tominaga et al., ). The actual reversal history of the. Geomagnetic deep sounding (GDS) is the use of electromagnetic induction methods to determine the electrical conductivity within the Earth, working from observations of natural geomagnetic variations. It is differentiated from the magnetotelluric method (q.v. . Joint interpretation of the anomalous part of the geomagnetic field with other geophysical fields allowed to conclude that the regional anomaly is caused by regularities of structure of the Earth.