Abstract
Shimshoni (1971) has reported that a greater seismic activity during local nighttime than during local daytime is to be found in the raw worldwide earthquake catalogue 1969-1971 of the National Ocean Survey (NOS). We agree that the daynight correlation exists on the raw catalogue, but believe that this would disappear after several corrections are applied to reduce the extent of the sample catalogue to which the day-night test is applied. Statistical analysis of an earthquake catalogue should be applied to unbiased samples. We have repeated Shimshoni’s analysis applied to a catalogue sample which has been restricted in extent. The reasons for these reductions are
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