Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/6236
AuthorsBruno, P. P.* 
Castiello, A.* 
Improta, L.* 
TitleUltrashallow seismic imaging of the causative fault of the 1980, M6.9, southern Italy earthquake by pre‐stack depth migration of dense wide‐aperture data
Issue DateOct-2010
Series/Report no./37 (2010)
DOI10.1029/2010GL044721
URIhttp://hdl.handle.net/2122/6236
Keywordspre-stack migration, seismic reflection, seismic tomography, irpinia fault
Subject Classification04. Solid Earth::04.02. Exploration geophysics::04.02.99. General or miscellaneous 
AbstractPre-Stack Depth Migration (PSDM) is an effective tool to improve seismic reflection imaging of laterally heterogeneous media. However, migration performance strongly depends on the accuracy of the velocity model, therefore, PSDM is often ineffective for ultrashallow imaging (100 m and less) of complex structures. In this study, we applied non-linear multiscale refraction tomography and PSDM on dense wide-aperture data to image the causative fault of the 1980, M6.9, Irpinia normal faulting earthquake in a very complex geologic environment. Dense wide-aperture profiling allowed us to build accurate velocity models by multi-scale non linear refraction tomography and to record wide-angle reflections from steep reflectors. PSDM provided superior imaging with respect to conventional post-stack depth migration, and a better definition of fault geometry and apparent cumulative displacement. The estimated throw of Irpinia fault is only 29-38 m. This value, combined with the vertical slip rate estimated by nearby trenches, suggests a young age (97-127 kyr) of fault inception. Our outcomes are in agreement with paleoseismic data and indicate that this imaging strategy can be very effective for near-surface fault detection and characterization.
DescriptionAn edited version of this paper was published by AGU. Copyright (2010) American Geophysical Union.
Appears in Collections:Papers Published / Papers in press

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