Abstract
Data are presented that address the problem of discrimination between earthquakes and explosions of small magnitude (3¾≤mb≤4¾). Data sources include various long-period seismometer installations in the United States. The data suggest that long-period discriminants useful at mb≥4¾ remain as useful at mb≥4. The conclusion is also drawn that detection of the surface wave of mb=4 earthquakes can be accomplished at distances of 6000–7000 km.
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