The improved algorithm of automatic detection and location of earthquakes by a single seismic array and its application for study of aftershock sequence in the spitsbergen archipelago

A new detection and location algorithm for a single seismic array is described. This algorithm is an improvement of methods of joint polarization analysis and beamforming. The method has been used in new automatic detector-locator program UDL (Universal Detector Locator) to process data of aftershock sequence of the strongest intraplate earthquake (Mw = 6.1) in Storfjorden, Spitsbergen archipelago. A temporal behavior of the sequence of the aftershocks is presented. It has been found that the sequence does not satisfy Omori law and have periodicity for events with M < 0. Possible reasons of this phenomenon are discussed.