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http://hdl.handle.net/2122/3446| Authors: | Antonioli, A.* Piccinini, D.* Chiaraluce, L.* Cocco, M.* |
Title: | Fluid flow and seismicity pattern: Evidence from the 1997 Umbria-Marche (central Italy) seismic sequence | Journal: | Geophysical Research Letters | Series/Report no.: | /32 (2005) | Publisher: | American Geophysical Union | Issue Date: | 26-May-2005 | DOI: | 10.1029/2004GL022256 | Keywords: | Diffusivity fluid flow Umbria-Marce normal fautling |
Subject Classification: | 04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution | Abstract: | 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 /s. The calculated value of anisotropic diffusivity (Daniso = 250 m /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. |
| Appears in Collections: | Article published / in press |
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