THE ELLIPTICITY FILTER-A PROPOSED SOLUTION TO THE MIXED EVENT PROBLEM IN NUCLEAR SEISMIC DISCRIMINATION

摘要

A proposed solution to the mixed event problem in nuclear seismic discrimination, termed the 'ellipticity filter', is cast in the form of a solution of the superposition equations defining the signals from a three-component seismometer station. Two cases of superposed signals are considered: Rayleigh with Rayleigh; Rayleigh with Love. Using the ellipticity constraint at the seismometer station site, the superposition equations defining each case are solved in closed form to yield the unknown complex source amplitudes and source azimuths. Actual filter procedure involves dividing the component signals into time intervals, taking the Fourier Transform for each time interval, and operating on each of the frequency components in a time interval with the ellipticity filter. (Modified author abstract)