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Fluid flow and seismicity pattern: Evidence from the 1997 Umbria‐Marche (central Italy) seismic sequence
Author(s) -
Antonioli Andrea,
Piccinini Davide,
Chiaraluce Lauro,
Cocco Massimo
Publication year - 2005
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2004gl022256
Subject(s) - induced seismicity , geology , anisotropy , isotropy , seismology , pore water pressure , thermal diffusivity , fluid dynamics , fluid pressure , perturbation (astronomy) , geophysics , mechanics , geotechnical engineering , physics , thermodynamics , quantum mechanics
We model the spatial and temporal evolution of seismicity during the 1997 Umbria‐Marche seismic sequence in terms of subsequent failures promoted by fluid flow. The diffusion process of pore‐pressure relaxation is represented as a pressure perturbation generated by coseismic stress changes and propagating through a fluid saturated medium. The values of isotropic diffusivity range between 22 and 90 m 2 /s. The calculated value of anisotropic diffusivity (D aniso = 250 m 2 /s) is largest along the average strike (N140°) direction of activated faults. Our results suggest that the observed spatio‐temporal migration of seismicity is consistent with fluid flow.