A note on Northern Marche seismicity: new focal mechanisms and seismological evidence

S. Santini


A geodynamic interpretation of the Northern Marche region is diffi cult, the zone being characterized by complex
structures which cannot be defi ned in the form of a simple, standard model. It is unquestionable that the geodynamic
setting, whatever it is, bears a strong infl uence on the seismic hazard assessment of a region, and this is the
background reason for the present note. In order to obtain a more detailed picture of seismological evidence in
this zone, 11 new fault plane solutions of crustal events with 2.9 < M < 4.3 were calculated, using data recorded
by the national seismic network of the Istituto Nazionale di Geofi sica e Vulcanologia in the period 1990-2000.
The aim is to add local information to the previous studies by Frepoli and Amato (1997, 2000). A possible result
of this new study is the division of the Northern Marche region into three areas with different focal mechanism
categories: the inner area of the Apenninic belt, the Adriatic on-shore and the Adriatic off-shore. This note is
intended to be a contribution to update seismological evidence in the Northern Marche region.


focal mechanisms;Northern Apennines;Adriatic off-shore;seismological evidence

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DOI: https://doi.org/10.4401/ag-4374
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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X