| Abstract: | Subroutine REDUC3 transforms a total field anomaly h1(x,y) , measured on a horizontal and rectangular grid, into a new anomaly h2(x,y). This new anomaly is produced by the same source as h1(x,y) , but (1) is observed at a different elevation, (2) has a source with a different direction of magnetization, and/or (3) has a different direction of residual field. Case 1 is tantamount to upward or downward continuation. Cases 2 and 3 are ‘reduction to the pole‘, if the new inclinations of both the magnetization and regional field are 90 degrees. REDUC3 is a filtering operation applied in the wave-number domain. It first Fourier transforms h1(x,y) , multiplies by the appropriate filter, and inverse Fourier transforms the result to obtain h2(x,y). No assumptions are required about the shape of the source or how the intensity of magnetization varies within it. |
| Genre: | USGS Numbered Series |
| ProdID: | 7916 |
| Citation Author: | Blakely, Richard J. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | 14, [12] leaves :ill. ;27 cm.; (25 p. - PGS) |
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| Citation Publisher: | U.S. Geological Survey, |
| Citation Series: | Open-File Report |
| Citation Series Code: | OFR |
| Citation Series Number: | 77-784 |
| Citation Search Results Text: | Documentation for subroutine REDUC3, an algorithm for the linear filtering of gridded magnetic data; 1977; OFR; 77-784; Blakely, Richard J. |
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| Citation Year: | 1977 |
| Type: | citation/reference |
| Text: | Documentation for subroutine REDUC3, an algorithm for the linear filtering of gridded magnetic data; 1977; OFR; 77-784; Blakely, Richard J. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/of/1977/0784/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/of/1977/0784/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey, |
