Imaging fluid-filled connected fault networks in the Pollino range.
Napolitano F., De Siena L., Gervasi A., Scarpa R., La Rocca M.
IV - Geofisica e fisica dell'ambiente
GSSI Ex ISEF - Aula D - Giovedì 26 h 09:00 - 12:30
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We used seismic recordings from the last Pollino swarm (2010--2014) and nearby to separate and map seismic scattering (from S-peak delays) and absorption (from late-time coda-wave attenuation) at different frequencies in the Pollino range and surroundings. High-scattering and high-absorption anomalies are markers of fluid-filled fracture networks extending from SE to NW across the range. With increasing frequency, these anomalies approximately follow epicenters on mapped faults from the sixteenth century until 1998 (Mercure). When fluids found the carbonates barrier in the NW direction (Lucanian Apennines), fractures opened new paths across the SW faults, favoring the nucleation of the last Pollino swarm.