| 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. |
| Genre: | Article |
| ProdID: | 70014831 |
| Citation Author: | Labson, Victor, F.; Becker, Alex |
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| Citation End Page: | 1707 |
| Citation Issue: | 12 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geophysics |
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| Citation Number Of Pages: | 11 |
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| Citation Search Results Text: | NATURAL-FIELD AND VERY LOW-FREQUENCY TIPPER PROFILE INTERPRETATION OF CONTACTS.; 1987; Article; Journal; Geophysics; Labson, Victor, F.; Becker, Alex |
| Citation Start Page: | 1697 |
| Citation Volume: | 52 |
| Citation Year: | 1987 |
| Type: | citation/reference |
| Text: | NATURAL-FIELD AND VERY LOW-FREQUENCY TIPPER PROFILE INTERPRETATION OF CONTACTS.; 1987; Article; Journal; Geophysics; Labson, Victor, F.; Becker, Alex |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Thu, 1 Jan 1987 00:00 -0600 |
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