Method for detecting long waves and predicting earthquakes
AssigneeCommunications Research Laboratory, Ministry of Posts and Telecommunications
InventorKozo Takahashi
Life of this patent
Estimating the term…
Abstract
A method for detecting earthquakes comprises the steps of picking up pre-earthquake long waves or earth currents at four or more observation points located underground or at the sea bottom, carrying out a computation based on the interrelation among the so-obtained= signals to obtain the three-dimensional distribution of the sources and intensities of the long waves or earth currents, and predicting the focal region, scale and time of occurrence of earthquakes from the time-course variation in the so-obtained three-dimensional image of the wave source.
Claims8
A method for detecting pre-earthquake long electromagnetic waves and for predicting earthquakes based thereon, comprising the steps of:
- locating a plurality of observation points at which long waves may be detected;
- installing an antenna at each of said plurality of locations;
- sensing the presence of said long waves by each of said antennas;
- transmitting a signal indicative of said long waves from each antenna to a storage device;
- storing data representing the transmitted signal in said storage device;
- computing the value of a phase shift time at which a correlation function between two of said signals becomes maximal;
- determining the location of a rotational hyperboloid of two sheets having its foci at the two observation points from which the sensed signals are obtained;
- repeating the computing and determining steps for at least one additional pair of sensed signals and observation points;
- determining the intersection of the hyperboloids;
- and
- predicting the occurrence, location and magnitude of an earthquake based on both the intersection of the hyperboloids and the correlation coefficient of said correlation function.
Dependencies are inferred from the claim text.