Correlation of Infrasonic Microbarometric Disturbances and Long Period Seismic Phenomena
Abstract
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, LASA/LAMA 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 earth's surface by a pressure cell loading effect.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1970
- Accession Number
- AD0716533
Entities
People
- Paul W. Pomeroy
Organizations
- University of Michigan