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Abstract
In this paper we analysed the historical and instrumental seismicity of the seismic district “Penisola Salentina” (Salento peninsula) in the southern part of the Apuliaregion, making use of the most recent seismological database. Relocation of available dataset points out that the events are spatially distributed over a belt of deformation that approximately corresponds to Soglia Messapica (Taranto-Brindisi depression). Besides, computed source characteristics indicate dextral strike-slip solutions with an approximately E-W orientation that seismologically confirm previous geodynamic studies indicating a NE-SW extension in the Taranto-Brindisi depression. In particular, the tensional stress associated to the present seismic activity could be the consequence of the relaxation of the buckling process following the extensional re-arrangement of the Apenninic belt masses. Moreover attenuation QPvalues obtained in this study are much greater than those inferred in other parts of Italian peninsula; this result agrees with previous macroseismic investigations and indicates a greater efficiency of the studied area in the transmission of body waves.
Highlights
The Apulian region stretches for about 350 km in the southern part of Italy, between the Adriatic and Ionian Sea
The internal part of Adria shows a minor, but not negligible, seismic activity [8,9]; in particular this region is near to different areas in which seismicity is frequent and intense; for example the Salento peninsula is less than 100 km far from Albanian and Greek coasts where many energetic earthquakes occurred
In this paper we considered the seismic activity occurred inside the district named “Penisola Salentina”, where 163 earthquakes were located with a maximum magnitude ML = 2.8
Summary
The Apulian region stretches for about 350 km in the southern part of Italy, between the Adriatic and Ionian Sea. It is constituted by an emerged sector of the Apulian plate [1] or Adriatic subplate [2] or Adria [3], characterized by a relatively thick lithosphere [4] and by a weakly deformed sedimentary cover [5] This plate, which shows a marked elongation from NW to SE, represents the Plio-Pleistocene foreland (Apulian foreland) of the Southern Apennine orogenic system to west and of the Dinaric and Hellenic chains to east, generated along its boundaries by the interaction with more deformable lithospheric structures. These regions are affected by diffuse seismicity whose characteristics are correlated to a general counter-clockwise motion of Adria [6,7] (Figure 1). Besides the propagation characteristics of the lithosphere of the foreland permit to the energy irradiated by hypocenters distant a few hundreds of kilometres of arriving into the Salento peninsula only weakly attenuated, as demonstrated from felts of Albanian and Greek earthquakes [10,11] and from macroseismic field of recent earthquakes (e.g. 8 January 2006, 3 February 2007, 25 March 2007)
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