Seismic trigger

Details Seismic trigger Seismic trigger

1977-03-08

1980-07-22

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

33366, 73654, 200 6145R, 200DIG8, 340540, G08B 2100

Patent

active

042142385

ABSTRACT:
An inverted, compound pendulum, which may be set in motion by a seismic variance, activates a photoelectric switching system. Logic circuitry in electrical contact with the switching system discriminates in a pre-determined manner with respect to the repetition rate of signals transmitted by the switching system and selectively activates and controls an alarm. Circuitry in the device permits display of the device's status and interacts with a self-contained power source to permit continued operation despite interruption of external power.

REFERENCES:
patent: 3709030 (1973-01-01), Aselman, Jr.
patent: 3774190 (1973-11-01), Kyle, Jr.
Adams, et al., "A Seismic Trigger for Real-Time Warning Local Tsunami Potentiality", Earthquake Notes, vol. 46, No. 4, Oct.-Dec. 1975.

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