Earthquake alarm

Abstract

An earthquake alarm has a casing, a P-wave detecting device and an S-wave detecting device. The casing has a power supply, a controlling unit and a sound alarming unit. The controlling unit is electrically connected with the power supply. The sound alarming unit is electrically connected with the controlling unit. The P-wave detecting device has a longitudinally moving element and a contacting tab. The longitudinally moving element has a first end connected securely to the casing and a second end movable relative to the casing along a longitudinal direction. The contacting tab is spaced from and selectively contacting with the second end of the longitudinally moving element and is electrically connected with the controlling unit. The S-wave detecting device has a pendulum hung in the casing and a contacting ring. The contacting ring is mounted around the pendulum and is electrically connected with the controlling unit.

Dependencies are inferred from the claim text.