Clues of postseismic relaxation for the 1915 Fucino earthquake (central Italy) from modeling of leveling data.

Amoruso, Antonella; Crescentini, Luca; D'Anastasio, E; And De Martini, P. M.

doi:10.1029/2005GL024139

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We study five high precision leveling lines located around the epicentral area of 13 January 1915, Mw = 6.7 Fucino earthquake (Italy), that possibly recorded late stage postseismic relaxation movements. The geodetic signal is expected to comprise both large-scale uplift of the Apennines and postseismic relaxation effects. In order to verify this hypothesis and to estimate the amount of each contribution, we compute gravitational visco-elastic postseismic relaxation by inverting leveling data. Results indicate that the elastic upper crust is relatively thin (about 10 km) and post-seismic contribution could be set at 30% of the geodetic signal. Model parameters are consistent with previous knowledge of the 1915 Fucino earthquake source, local seismic hypocentral determinations and crustal models derived from surface waves.

Titolo:	Clues of postseismic relaxation for the 1915 Fucino earthquake (central Italy) from modeling of leveling data.
Autori:	AMORUSO, Antonella CRESCENTINI, Luca D'ANASTASIO E AND DE MARTINI P. M. mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2005
Rivista:	GEOPHYSICAL RESEARCH LETTERS
Abstract:	We study five high precision leveling lines located around the epicentral area of 13 January 1915, Mw = 6.7 Fucino earthquake (Italy), that possibly recorded late stage postseismic relaxation movements. The geodetic signal is expected to comprise both large-scale uplift of the Apennines and postseismic relaxation effects. In order to verify this hypothesis and to estimate the amount of each contribution, we compute gravitational visco-elastic postseismic relaxation by inverting leveling data. Results indicate that the elastic upper crust is relatively thin (about 10 km) and post-seismic contribution could be set at 30% of the geodetic signal. Model parameters are consistent with previous knowledge of the 1915 Fucino earthquake source, local seismic hypocentral determinations and crustal models derived from surface waves.
Handle:	http://hdl.handle.net/11386/1065509
Appare nelle tipologie:	1.1.2 Articolo su rivista con ISSN

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