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Bulletin of the Seismological Society of America; October 1979; v. 69; no. 5; p. 1475-1486
© 1979 Seismological Society of America
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Human perception of T waves: The June 22, 1977 Tonga earthquake felt on Tahiti

JACQUES TALANDIER and EMILE A. OKAL

LABORATOIRE DE DETECTION & GEOPHYSIQUE COMMISSARIAT A L'ENERGIE ATOMIQUE, BOITE POSTALE 640, PAPEETE, TAHITI
DEPARTMENT OF GEOLOGY & GEOPHYSICS YALE UNIVERSITY, NEW HAVEN, CONNECTICUT 06520

Abstract

We report human perception of seismic waves generated on the island of Tahiti by exceptionally large T waves, following a major earthquake in the Tonga area. The generation mechanism of the T waves and their smaller amplitudes at other Pacific stations are explained in relation to source and receiver bathymetry, focal mechanism, and magnitude of the event. It is concluded that a series of favorable path conditions, rather than the size of the event (Ms = 7.8; Mw = 8.1), were responsible for the giant T waves felt at Tahiti.




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