Gutenberg, B. (1945) Amplitudes of surface waves and magnitudes of shallow earthquakes. Bulletin of the Seismological Society of America, 35 (1). pp. 3-12. ISSN 0037-1106. doi:10.1785/BSSA0350010003. https://resolver.caltech.edu/CaltechAUTHORS:20140730-122828536
|
PDF
- Published Version
See Usage Policy. 725kB |
Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20140730-122828536
Abstract
A study of amplitudes of surface waves having periods of about 20 seconds is employed to improve the calculation of magnitudes of distant shallow earthquakes. Table 3 gives station corrections; table 4, revised figures for the effect of epicentral distance. It is found that for epicentral distances between about 20° and 175° the average observed amplitudes correspond closely to those calculated with an absorption coefficient k = 0.0003 per km. For paths completely outside or inside the Pacific Basin, k = 0.0002± per km., while for paths tangent to its boundary the amplitudes of surface waves with periods of about 20 seconds may be reduced by two-thirds or more (in extreme cases by almost nine-tenths) through reflection or refraction of energy; such seismograms of shallow shocks may be taken as indicating intermediate depth of focus.
Item Type: | Article | ||||||
---|---|---|---|---|---|---|---|
Related URLs: |
| ||||||
Additional Information: | Copyright © 1945 by the Seismological Society of America. Manuscript received for publication June 2, 1944 | ||||||
Other Numbering System: |
| ||||||
Issue or Number: | 1 | ||||||
DOI: | 10.1785/BSSA0350010003 | ||||||
Record Number: | CaltechAUTHORS:20140730-122828536 | ||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140730-122828536 | ||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||
ID Code: | 47674 | ||||||
Collection: | CaltechAUTHORS | ||||||
Deposited By: | George Porter | ||||||
Deposited On: | 31 Jul 2014 20:29 | ||||||
Last Modified: | 10 Nov 2021 17:49 |
Repository Staff Only: item control page