Measuring and testing – Gas analysis – With compensation detail
Patent
1994-05-05
1995-04-25
Williams, Hezron E.
Measuring and testing
Gas analysis
With compensation detail
7386473, 324324, G01V 500
Patent
active
054088623
ABSTRACT:
An early warning system for providing notice that seismic activity, such as an earthquake, is imminent. The earthquake early warning system includes a subterranean detector unit assembly having a plurality of detector units carried by a subterranean inverted conduit. The conduit is filled with a dense, dry inert aggregate and has a soil interface consisting of a perforated metal screen or porous fabric material thus allowing migrating gases to migrate into the conduit. Gas detectors carried by the conduit detect the gases as they migrate into the conduit. Access tubes are provided to allow access to the detectors from the surface of the ground without exhuming the conduit assembly. The conduit would carry a plurality of detectors and associated access tubes for monitoring migration of gases across a linear distance. The detectors are in communication with a monitoring facility for monitoring the rate of migration of gases. The monitoring facility has means for sensing a rate of gaseous migration accelerated beyond the normal background rate and thus trigger an alarm that seismic activity that may precede an earthquake is occurring. In the preferred embodiment, the conduit would follow a slope, or a known fault line and would be arrayed with other subterranean, assemblies in a given area.
REFERENCES:
patent: 4065972 (1978-01-01), Holub et al.
patent: 4297574 (1981-10-01), Card et al.
patent: 4642296 (1987-02-01), Hubner
patent: 4735095 (1988-04-01), Issel
patent: 4786804 (1988-11-01), Ilmasti
patent: 5137830 (1992-08-01), Milly
Wiggins J. David
Williams Hezron E.
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