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http://hdl.handle.net/2122/14248
Authors: | Totaro, Cristina* Seeber, L.* Waldhauser, F.* Steckler, M.* Gervasi, Anna* Guerra, Ignazio* Orecchio, Barbara* Presti, D.* |
Title: | An Intense Earthquake Swarm in the Southernmost Apennines: Fault Architecture from High-Resolution Hypocenters and Focal Mechanisms | Journal: | Bulletin of the Seismological Society of America | Series/Report no.: | 6/105 (2015) | Publisher: | SSA | Issue Date: | 2015 | DOI: | 10.1785/0120150074 | URL: | https://pubs.geoscienceworld.org/ssa/bssa/article-abstract/105/6/3121/332020/An-Intense-Earthquake-Swarm-in-the-Southernmost?redirectedFrom=fulltext | Abstract: | Between 2010 and 2013, the Pollino Mountains region (south Italy), already proposed as a seismic gap, was affected by a seismic crisis of more than 5000 small-to-moderate earthquakes (maximum magnitude ML 5.0). Preliminary analyses performed in a previous work highlighted that this activity can be ascribed to normal faulting on north-northwest-trending west-dipping dislocation surfaces consistent with the general seismotectonic frame of the southern Apennines. This work contributes additional data and a more sophisticated analyses that highlight new features of the seismic swarm and support a new interpretation for the study area. We obtained high-precision locations and focal mechanisms using the double-difference method and the cut-and-paste waveform inversion method, respectively. The 3D patterns of hypocenters and focal mechanisms consistently image an ∼10-km-long north-northwest-striking and west-dipping fault zone between 5 and 10 km depth, with predominantly extensional kinematics. The high-resolution data show that this zone broadens from north to south as a result of secondary faulting. The depicted geometry, with preliminary geological observation, leads to the hypothesis of multiple seismogenic normal faults rooted into more regional shallow-dipping detachments inherited from the pre-existing Apennine thrust tectonics. |
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