Discriminating earthquake detector

Details Discriminating earthquake detector Discriminating earthquake detector

1989-09-28

1992-03-31

Swann, III, Glenn R.

Communications: electrical

Condition responsive indicating system

Specific condition

73654, 340540, G08B 2100

Patent

active

051011956

ABSTRACT:
An earthquake detector is provided for mounting on a structural member of a building or the like, which is resistant to false alarms arising from door slamming, traffic, running, sonic booms, etc., and yet which is sensitive to earthquakes and especially to P-waves which often precede destructive S-waves. The apparatus includes a motion detector for generating an alarm signal, which is responsive only to vibrations below a frequency of about 14 Hz, to avoid false alarms from non-earthquake vibrations. The detector can include a cantilevered beam device with a weight on its free end, and which generates a signal as the weight moves up and down, and a filtering circuit that passes primarily signal components of a frequency between 3 and 14 Hz. The beam device preferably is highly damped so its response is only slightly higher at its resonance frequency than at other frequencies.

REFERENCES:
patent: 3186237 (1965-06-01), Forrest
patent: 4300135 (1981-11-01), Korn et al.
patent: 4300220 (1981-11-01), Goff et al.
patent: 4408196 (1983-10-01), Freeman
patent: 4473768 (1984-09-01), Kerr et al.
patent: 4616320 (1986-10-01), Kerr et al.
patent: 4689997 (1987-09-01), Windisch
patent: 4764762 (1988-08-01), Almour

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