Earthquakes are a menace to life and property, but they are also a source of important scientific knowledge, for they give us information about the interior of the earth which we can obtain in no other way. The United States Coast and Geodetic Survey has developed instruments for the recording of strong earth motions; has recorded tilt of large areas; has determined dominant periods of buildings, of water towers, of dams and of the ground; and has made special studies of a statistical nature about these phenomena.

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