In Paul G. Richards, 2017, “The history and outlook for seismic monitoring of nuclear explosions in the context of the Comprehensive Nuclear-Test-Ban Treaty,” Nonproliferation Review 23.3-4 (pp. 287–300), the third sentence of the first paragraph on p. 287 should read,
In the seven years (1979 to 1985) when his directorship took place, the five nuclear-weapon states recognized by the 1968 Treaty on the Non-Proliferation of Nuclear Weapons conducted 362 nuclear tests—116 by the United States, 157 by the Soviet Union, ten by the United Kingdom, sixty-nine by France, and seven by China—that is, about once per week.
The fifth sentence of the second paragraph on p. 293 should read,
Earlier examples of problem events from which new techniques emerged have included the following: (a) mining collapses in 1989 and 1995 that, in some respects, generated seismic waves similar to those of explosions—but that were then shown to be implosive rather that explosive, on the basis of the polarity of their surface waves;17 (b) earthquakes in the Kara Sea, especially in 1997, near the former Soviet nuclear test site at Novaya Zemlya, shown indeed to be earthquakes and not explosions on the basis of measured ratios of high-frequency P- and S-waves;18 and (c) rock bursts in South Africa, also shown to be implosive in nature rather than explosive, this time on the basis of first downward motions in distant P-wave signals (rather than the first upward motions to be expected of an explosion).19
The first and second sentences of the final paragraph on p. 295 should read,
The work of obtaining a much more precise location for seismic events is increasingly undertaken on larger and larger scales—i.e., over broader areas and longer times. By using more than three billion measurements of relative arrival times, for example, scientists have obtained improved locations for more than 300,000 events that took place in California over two decades.24
The first complete sentence in note 18 on p. 299 should read,
Measurements of the comparative strength of seismic P-waves and S-waves now provide one of the best objective methods of distinguishing between earthquake and explosion signals.