An algorithm for doble difference joint hypocenter determination: application to the 2002 Molise (Central Italy) earthquake sequence

R. Console, A. Giuntini


We have developed an original computer code for double difference hypocenter
determination including an independent routine for the cross-correlation estimate of the time
difference between two waveform segments, relative to different events recorded by the same
stations. This computer code has been tested relocating a set of 26 events recorded by the seismic
stations of the telemetered Italian national network operated by the INGV. The hypocentral
solutions so obtained are characterized by standard deviations typically of the order of magnitude
of 50 m, in comparison with the errors of a few kilometers characterizing the performance of the
INGV bulletins. The proximity of hypocenters in several groups of events closely separated in time
shows that our relocations are the result of an accurate analysis, rather than that of random errors.
The method developed in this study is suitable for rapid and accurate hypocentral determination
carried out by a permanent sparsely distributed network of stations, even before that mobile
equipment installed in the area affected by new seismic activity allows higher resolution locations.


Aftershocks;Foreshocks;Joint Hypocenter Determination;Double Difference

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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X