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Scattering and absorption imaging of a highly fractured fluid-filled seismogenetic volume in a region of slow deformation

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Geoscience Frontiers 2020年第3期11卷 989-998页

作者： Ferdinando Napolitano Luca De Siena Anna Gervasi ignazio guerra Roberto Scarpa Mario La Rocca Dipartimento di Fisica“E.R.Caianiello” Universita Degli Studi di SalernoVia Giovanni Paolo IIFiscianoSA84084Italy Institute of Geosciences Johannes Gutenberg University MainzJ.-J.-Becher-Weg 21MainzD-55128Germany University of Aberdeen School of GeosciencesGeology and Petroleum GeologyMeston BuildingKing’s CollegeAberdeenScotlandAB243UEUK Dipartimento di Biologia Ecologia e Scienze Della TerraUniversit a Della CalabriaPonte P.BucciArcavacata di RendeCS87036Italy Istituto Nazionale di Geofisica e Vulcanologia Sezione di Rende(CS)Ponte P.BucciArcavacata di RendeCS87036Italy

Regions of slow strain often produce swarm-like sequences,characterized by the lack of a clear mainshockaftershock *** comprehension of their underlying physical mechanisms is challenging and still *** used seismic recordings from the last Pollino swarm(2010-2014) and nearby to separate and map seismic scattering(from P peak-delays) and absorption(from late-time coda-wave attenuation) at different frequencies in the Pollino range and ***-scattering and high-absorption anomalies are markers of a fluid-filled fracture volume extending from SE to NW(1.5-6 Hz) across the *** increasing frequency,these anomalies approximately cover the area where the strongest earthquakes occurred from the sixteenth century until *** our interpretation,the NW fracture propagation ends where carbonates of the Lucanian Apennines begin,as marked by a high-scattering and low-absorption *** the highest frequency(12 Hz) the anomalies widen southward in the middle of the range,consistently marking the faults active during the recent Pollino *** results suggest that fracture healing has closed small-scale fractures across the SE faults that were active in the past centuries,and that the propagation of fluids may have played a crucial role in triggering the 2010-2014 Pollino *** that the fluid propagation ended at the carbonates barrier in the NW direction,fractures opened new paths to the South,favoring the nucleation of the last Pollino ***,the recently active faults in the middle of the seismogenic volume are marked by a high-scattering and highabsorption *** work provides evidence that attenuation parameters may track shape and dynamics of fluid-filled fracture networks in fault areas.

关键词： Polling Seismic attenuation Scattering Fluids Fractures Healing

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