Correlation of Infrasonic Microbarometric Disturbances and Long Period Seismic Phenomena
Annual rept. no. 1, 1 Feb 1969-31 Jan 1970
MICHIGAN UNIV ANN ARBOR
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The report calls for detailed analyses of the correlation between infrasonic microbarometric phenomena and signals observed on long period seismographs. Specifically, these studies include acoustic wave generation a in the vicinity of the earthquake epicenter b in the vicinity of the seismic and acoustic receivers and c due to coupling between Rayleigh waves and acoustic waves. The contract also provides for the study of the source and propagation characteristics of infrasonic phenomena other than those directly correlatable with seismic events. During this period, work has been concentrated on the correlation of microbarometric fluctuation and long period seismic noise. Studies of data from La Paz, Bolivia, LASALAMA Montana and Sugar Island, Michigan show a strong correlation between the microbarometric background noise and the long period seismic noise. It is concluded that the energy transfer is the result of deformation of the earths surface by a pressure cell loading effect.
- Seismic Detection and Detectors