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Published October 1967 | Published
Journal Article Open

The Alaska earthquake of 28 March 1964: A complex multiple rupture


The seismograms of the Alaskan earthquake of 28 March 1964 are characterized by multiple P-phases not predicted by the travel-time curves. Seismograms with low magnifications from 80 stations covering distances from 40° to 90° and a wide range of azimuths were analyzed. The character of the P-wave portion of the seismograms is interpreted in terms of an approximate multiple-event source mechanism where the propagating rupture triggers larger distinct events. Six events were located using the Gutenberg sine-curve method. The times after the initial origin time were 9, 19, 28, 29, 44 and 72 sec respectively, and the events were located 35, 66, 89, 93, 165 and 250 km away from the initial epicenter. Dividing the distance by the delay-time gives an average rupture velocity of 3.5 km/sec.

Additional Information

Copyright © 1967, by the Seismological Society of America. Manuscript received April 14, 1967. We wish to thank all those who cooperated by sending seismograms of the Alaskan earthquake. This study was supported by National Science Foundation Grant GP 2806.

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