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Title:
Soil radon monitoring for earthquake research: A study of radon concentrations using alpha particle sensitive films in shallow soil holes along the San Jacinto Fault zone in Southern California
Authors:
Birchard, G. F.
Affiliation:
AA(California Univ., Los Angeles)
Publication:
Ph.D. Thesis California Univ., Los Angeles.
Publication Date:
09/1978
Category:
Geophysics
Origin:
STI
NASA/STI Keywords:
ALPHA PARTICLES, EARTHQUAKES, ENVIRONMENTAL MONITORING, RADON, SOILS, CONCENTRATION (COMPOSITION), GAS DYNAMICS, MEASURING INSTRUMENTS, SOIL MOISTURE, STRAIN DISTRIBUTION
Bibliographic Code:
1978PhDT........55B

Abstract

The detector integrates the concentration observed over the exposure period with a length generally from days to weeks and short period noise is removed. The method is very simple, is well suited to volunteer participation and is potentially very inexpensive. Three years of measurement show that radon concentrations in soil gas are high in the winter and low in the summer. Changes in soil moisture content are one cause of this annual cycle. Before earthquakes, radon concentration changes have been observed. Radon concentration increased three weeks before a M4.3 earthquake on the San Jacinto Fault in Southern California and the amount of increase was a function of the distance of the measurement site from the epicenter. Soil gas flow may be a sensitive function of changes in compression or dilation of the soil and underlying rock. Radon measurements may be monitoring very small changes in the strain field which occur prior to earthquakes.
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Database: Astronomy
Physics
arXiv e-prints