Revised travel times in southern California
- Creators
- Gutenberg, B.
Abstract
Discrepancies of up to 20 per cent between wave velocities calculated from blast records in southern California and those found from earthquakes necessitate a reinterpretation of seismograms of all near-by shocks and a revision of travel-time curves. A combination of findings for S — P intervals as a function of distance in southern California earthquake records with the ratio of mean interval velocities for P and S waves shows (without assumption of origin times) that the mean velocities of the two waves between the source and the surface are about 6.35 and 3.67 km/sec., respectively. This agrees with the results found from blast records. Most revised origin times are between ¾ sec. and 1 1/2 sec. later than those found previously from Formula. The method applied here removes the difference in origin time for longitudinal and transverse waves which was found formerly for earthquakes. Travel-time curves of various phases are revised and reinterpreted. The change in amplitudes with distance of several wave types is discussed.
Additional Information
Copyright © 1951, by the Seismological Society of America. Manuscript received for publication April 5, 1950. The figures were drafted by Mr. John M. Nordquist.Attached Files
Published - 143.full.pdf
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Additional details
- Eprint ID
- 48073
- Resolver ID
- CaltechAUTHORS:20140806-111209764
- Created
-
2014-08-06Created from EPrint's datestamp field
- Updated
-
2023-05-03Created from EPrint's last_modified field
- Other Numbering System Name
- Caltech Division of Geological Sciences
- Other Numbering System Identifier
- 534