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NATURAL-FIELD AND VERY LOW-FREQUENCY TIPPER PROFILE INTERPRETATION OF CONTACTS.

Geophysics

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Abstract

Anomalous vertical magnetic field (tipper) profiles acquired using natural or very low-frequency (VLF) radio transmitter sources can be interpreted simply and rapidly for a number of geologic settings. The relations between computed numerical models, and outcropping dipping and buried vertical contacts are presented. In this paper in a series of interpretation charts. Use of the tipper phase in the analysis minimizes the effect of transmitter azimuth in the VLF case. Two examples illustrate the application to field data. An audiofrequency natural-field tipper profile over a conductive bed in a north-central Washington State metasedimentary sequence demonstrates the interpretation procedure for a dipping contact. VLF profiles over covered basement faults in Ontario demonstrate the application for a buried vertical contact. In both cases the quick results are in agreement with the much more laborious trial-and-error matching to two-dimensional models.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
NATURAL-FIELD AND VERY LOW-FREQUENCY TIPPER PROFILE INTERPRETATION OF CONTACTS.
Series title:
Geophysics
Volume
52
Issue:
12
Year Published:
1987
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geophysics
First page:
1697
Last page:
1707
Number of Pages:
11