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Published October 1943 | Published
Journal Article Open

Apparent origin time of S̄


Representative travel times for 50 shocks in southern California indicate that transverse waves appear to leave the focus about half a second earlier, on the average, than longitudinal waves. If fault rupture is propagated with a speed greater than that of transverse waves, the originating of such waves along a moderately extended fault segment will completely explain the observations. An exact theory is given on the simplest assumptions.

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Copyright © 1943, by the Seismological Society of America. Manuscript received for publication March 1, 1943.

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August 19, 2023
October 26, 2023