Patent ID: 8488416
Filing Date: 2013-07-16
Classification: G01V,G08B

Abstract:
1. An earthquake detection and alarming apparatus, comprising: a transparent object having a concave surface on the top thereof; an apiary of light projectors placed above said concave surface; an apiary of light receivers correspondingly to said apiary of light projectors, said apiary of light receivers being placed below said concave surface; a non-transparent rollable object displaceable along said concave surface for blocking a portion of light projected from said light projectors unto said light receivers; and circuitry for determining: (a) vibrating frequency and amplitude of said rollable object responsive to a position and a displacement on said concave surface; and (b) deducing therefrom the arrival of primary waves; wherein said position and said displacement are determined responsive to said light receivers detecting unblocked light projected from corresponding light projectors.