Earthquake detector

Details Earthquake detector Earthquake detector

1988-12-15

1991-03-19

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

340669, 340540, 200 6147, 73654, G08B 2100

Patent

active

050014668

ABSTRACT:
An earthquake detector is provided, which can sound an alarm several seconds before the arrival of the major shock of an earthquake, and which can be easily adjusted for sensitivity. For detecting local earth shaking of at least a predetermined dangerous acceleration level that constitutes a significant danger, a detector is provided that responds to shaking motion of an acceleration level between one-half and one-eighth the predetermined dangerous acceleration level to detect P-waves that arrive before the destructive S-waves, and which generates an audible alarm upon such detection. In one detector, two mercury-type switches are mounted with their directions of sensitivity both horizontal but perpendicular, the switches being mounted on a circuit board that can be tilted to alter their sensitivities. In another detector, a beam device includes a largely horizontal beam that has an inner end held on a mount and an outer end that supports a weight, and generates an electrical signal indicating the magnitude of beam deflection. The beam device can be formed by a strip of piezoelectric material which generates a voltage dependent upon beam deflection.

REFERENCES:
patent: 3186237 (1965-06-01), Forrest
patent: 3289155 (1966-11-01), Parrack
patent: 3665259 (1972-05-01), Brailsford
patent: 3714456 (1973-01-01), Krohmer et al.
patent: 4297690 (1981-10-01), Baker
patent: 4598587 (1986-07-01), Dwyer et al.
patent: 4689997 (1987-09-01), Windisch

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