Seismicity of the Earth and Associated Phenomena

Princeton, New Jersey: Princeton University Press, 1949. — 284 p.When two of the world's most distinguished seismologists have been working on a subject for more than ten years, one may expect important results to come out. These expectations are more than satisfied by this book, which contains the important results obtained at the Seisniological Laboratory at Pasadena. The book is epoch-making in geophysics, particularly because it treats a statistically homogeneous material. This is facilitated by a consequent use of Richter's magnitude scale for earthquakes, originally introduced in 1935, and considerably developed in subsequent years by Gutenberg and Richter. Its importance lies in the fact that the magnitude is strictly defined in instrumental quantities, thus completely objective.