Abstract
Summary The detection of moonquakes that occur when the Moon is at perigee has prompted a search for tidal effects on earthquake occurrences. An attempt was made to correlate earthquakes listed in the CGS-NOA epicentre determinations with the tidal phase of semidiurnal tides. This study was confined to several seismic regions representative of tectonic and non-tectonic regions. An extended form of Schuster's test was used to decide whether significant correlations existed. Though some tidal influences could be accepted at a 5 per cent significance level, the effect was not consistent or stable with time. Earthquakes, if they are affected by tides, show a slight tendency to occur at times when the tidal stress is changing most rapidly. Insufficient data was available to compare tectonic to non-tectonic areas. An analysis of the Japanese aftershock sequence which began 1969 August 11 was found to have no significant tidal correlation.
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