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Published April 10, 1983 | Published
Journal Article Open

Travel times and station corrections for P waves at teleseismic distances


Approximately 3300 shallow focus earthquakes and 1000 seismic stations have been used in a study of P wave travel times and station residuals, including azimuthal effects. The events were selected from a catalog containing 160,000 earthquakes, and those having uniform distance and azimuthal coverage were systematically relocated and used to refine P wave travel times and station corrections. Station corrections are provided for 994 seismic stations. The station corrections involve three terms: the static effect and two cosine terms with appropriate phase shifts. They exhibit general consistency over broad geographic areas and, where coverage is dense, often show abrupt changes from one geological province to another. The cos 2θ terms appear to be due to upper mantle anisotropy, and they correlate with the stress direction in the crust.

Additional Information

© 1983 American Geophysical Union. Manuscript Accepted: 22 OCT 1982; Manuscript Received: 14 JUN 1982. It is a great pleasure for us to dedicate this paper to Anton Hales who, in large measure, is responsible for its existence. Anton's dedication to the understanding of all of the uncertainties and subtleties in the travel time and location problems was a constant source of inspiration to us, and his personal advice and vast experience were tapped on many occasions. His studies with John Cleary provided many insights which we have profited from. Alan Douglas provided us with a detailed critique of our earlier travel time studies and convinced us that relocation of many events was a prerequisite for further progress in this field. This research was supported by National Science Foundation grants EAR81-20944 (Harvard) and EAR77-14675 (Caltech). Contribution 3801 of the Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125.

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