A geometricla error in some Computer Programs based on the Aki-Christofferson-Husebye (ACH) Method of Teleseismic Tomography
Bulletin of the Seismological Society of America
By: B. R. Julian, J.R. Evans, M.J. Pritchard, and G. R. Foulger
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Abstract
Some computer programs based on the Aki-Christofferson-Husebye (ACH) method of teleseismic tomography contain an error caused by identifying local grid directions with azimuths on the spherical Earth. This error, which is most severe in high latitudes, introduces systematic errors into computed ray paths and distorts inferred Earth models. It is best dealt with by explicity correcting for the difference between true and grid directions. Methods for computing these directions are presented in this article and are likely to be useful in many other kinds of regional geophysical studies that use Cartesian coordinates and flat-earth approximations.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | A geometricla error in some Computer Programs based on the Aki-Christofferson-Husebye (ACH) Method of Teleseismic Tomography |
| Series title | Bulletin of the Seismological Society of America |
| DOI | 10.1785/0119990169 |
| Volume | 90 |
| Issue | 6 |
| Year Published | 2000 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Bulletin of the Seismological Society of America |
| First page | 1554 |
| Last page | 1558 |
| Google Analytic Metrics | Metrics page |