Abstract: A method or system for detecting a seismic event includes detecting a primary wave of a seismic event using at least one sensor at a measurement location; using at least one parameter of the detected primary wave to determine an estimated peak ground intensity at the measurement location without determining the magnitude of the seismic event; determining an epicenter of the seismic event; and estimating the intensity of the seismic event at a specified location using the determined estimated peak ground intensity and the distance of the specified location from the epicenter. The epicenter can be determined using sensors at a single location. A noise detection system can filter out detected signals that correspond to local vibrations rather than seismic events.

Abstract: Embodiments disclose a system and method that distributes warning with a description the probability of the severity of the hazardous condition producing the warning and incorporating a policy engine for expressing rules for responding to the warning.

Abstract: A P-wave sensing apparatus including a printed circuit board having mounted thereon from one to three orthogonally disposed miniature sensors that function as inertia monitoring devices with respect to motion of the external supporting structures, a plurality of amplifying and filtering circuits for amplifying and filtering the outputs generated by the sensors, and a central processing unit responsive to the amplified signals and operative to generate output signals which can be used to drive optical and audible annunciators, automated data recording systems, or other device actuating systems. Each sensor is formed by a thin piezo-electric film sandwiched between two metallization layers and is laminated to a small rectangular sheet of polyester mounted in cantilever fashion with one edge thereof firmly affixed to a supporting circuit board or clamped between two flat, solid layers (such as miniature circuit boards) and then firmly affixed to the main supporting circuit board.