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Short-term warnings based on continuous observation of the strike of horizontal compressions from fault plane solutions of microearthquakes

A short-term warning algorithm has been developed which is based on completely automatic evaluations of automatically located small earthquakes and automatic fault plane solutions. This algorithm is already in continuous operation at IMOR.DG for some areas of Iceland, for short-term warning and for testing. It shows stable strike directions during a long period of time, changing however when there is a change in the mode of microearthquake activity. There are examples of precursory changes of this parameter before large earthquakes. A description of the method and results is found under Subproject 1. The method has been developed at IMOR.DG on basis of methods for fault plane solutions based on spectral amplitudes by Ragnar Slunga at UUPP.DGEO.



Hjorleifur Sveinbjornsson
2001-01-08