Symposium on Microseisms Held at Arden House, Harriman, N.Y. 4-6 September 1952, Sponsored by the Office of Naval Research, and the Geophysical Research Directorate of the U.S. Air Force. (1953) / Chapter Skim
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Sketch of the History of Microseismology
Sketch of the History of Microseismology
Pages 3-8
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From page 3... ...
Bertelli was, of course, not the first to observe that the surface of the earth is in a state of more or less continuous agitation. Astronomers and geodesists using a pool of mercury as a reference level found the surface of the mercury rarely quiet.
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In addition to the surf theory, three other main theories or groups of theories have been advanced to explain microseisms. These are first, theories of local origin, meteorological or geological, at or near the recording station, secondly, theories of thermometric or barometric gradients travelling over continental areas; and thirdly, theories connected with storms or storm waves at sea.
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From page 5... ...
Coming now to other bands of frequencies, research is still in its infancy on microseisms of two to three seconds period yet certain facts have been ascertained concerning them. In the case of "group" microseisms of four to eight seconds period, Klotz, Gherzi, Ramirez, Donn and others observed that the amplitudes rise rapidly and take on their characteristic form when a low pressure area leaves the continent and enters the ocean and that the amplitudes fall rapidly and the waves lose their regular form when the storm leaves the water and enters the land.
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111-117, 1936. HECKER, O., Versuche zur Bestimmung der Fortpftantzungsgeochwindigkeit der Boden, bewegung bei der mikr.
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13031311, 1951. Discussion JAMES TINLEY WILSON University of Michigan Father Macelwane has given an excellent summary of the early history of the study of microseisms and of the steps which have led to our present state of knowledge.
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From page 8... ...
Some of this has been done out of necessity in an attempt to extract useful microseism data from seismograms run for the routine recording of earthquakes. In other cases it has been in an attempt to obtain correlations between microseismic activity and weather conditions.
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