Separation of longitudinal and transversal components in microtremors by using a horizontal component seismic array

Abstract

A new method is developed to estimate separately the longitudinal and transversal component frequency-wavenumber (f-k) power spectrum of microtremors by using a horizontal component seismic array. This method is a generalization of the conventional maximum-likelihood method (MLM) which applies only to single channel inputs. Validity of the new method is demonstrated by using synthetic microtremor records.