Much of the research published during the past 4 years has been concerned with the integration of data on worldwide regional seismicity with hypotheses of global tectonics and the use of data on precisely located small earthquakes and microearthquakes to study processes of faulting and volcanism. Other topics that received attention include the sequence of large earthquakes in time and space and other aspects of long-term seismicity and the statistical features of the distributions of earthquakes with respect to time and magnitude. This review excludes material referenced by Sykes [1967a].
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