Active tectonics in the central Apennines and possible implications for seismic hazard analysis in peninsular Italy

Cello, Giuseppe; Mazzoli, Stefano; Tondi, Emanuele; Turco, Eugenio

doi:10.1016/s0040-1951(96)00275-2

Cited by 216 publications

(120 citation statements)

References 27 publications

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“…There are numerous high-angle normal faults oriented roughly north-west -south-east showing several hundreds of meters of displacement (Cello et al, 1997). Many of the largest earthquakes that have occurred in the Italian peninsula have normal faulting mechanisms indicating extension perpendicular to the trend of the Apennine belt.…”

Section: The L'aquila Event and Seismic Hazard In The Central Apenninesmentioning

confidence: 99%

Field observations from the Aquila, Italy earthquake of April 6, 2009

Rossetto

Peiris

Alarcón

et al. 2010

Bull Earthquake Eng

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On April 6, 2009 an earthquake of Magnitude 6.2 (M w ) struck the Abbruzzo region of Italy causing widespread damage to buildings in the city of L'Aquila and surrounding areas. This paper summarizes field observations made by the Earthquake Engineering Field Investigation Team (EEFIT) after the event. The paper presents an overview of seismological and geotechnical aspects of the earthquake as well as a summary of the observed damage to buildings and infrastructure. A brief overview of the earthquake casualties is also reported.

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Section: The L'aquila Event and Seismic Hazard In The Central Apenninesmentioning

confidence: 99%

Field observations from the Aquila, Italy earthquake of April 6, 2009

Rossetto

Peiris

Alarcón

et al. 2010

Bull Earthquake Eng

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“…Geological and geophysical data suggest that the region can be considered still active although it is debated whether the regional stress is dominated by crustal extension normal to the Apenninic chain (ANDERSON and JACKSON, 1987;FREPOLI and AMATO, 1997) or whether the normal faults act as a response to different processes, such as pull-apart tectonics in a strike-slip regime (CELLO et al, 1997). Generally, the area is characterized by diffuse crustal seismicity.…”

Section: The 1997 Umbria-marche Italy Earthquake Sequencementioning

confidence: 99%

Preseismic Creep Strains Revealed by Ground Tilt Measurements in Central Italy on the Occasion of the 1997 Umbria-Marche Apennines Earthquake Sequence

Sgrigna¹,

Malvezzi²

2003

Pure and Applied Geophysics

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Daily averaged tilt component data from four sites of the Central Apennines (Italy) revealed intermediate-term tilts of a few months as possible precursors of the seismic sequence occurred in the Umbria-Marche region during 1997. A change was also observed in the secular tectonic trend recorded at one site and referred to the same seismic sequence. The observed intermediate-term preseismic tilts are considered as the manifestation of aseismic creep episodes in the fault materials close to the tilt sites. The mechanism refers to a strain field slowly propagating from the dilatancy (focal) area to the tiltmeters, through rigid crustal blocks separated by weak transition zones with viscoelastic rheology. This propagation is thought to be the cause of the local aseismic fault slip recorded by tiltmeters. In one case such creep strains revealed to have larger amplitude and higher frequency content than those accepted for fault materials, and this was attributed to an amplified response of the heterogeneous ground surface at the site. The existence of a propagating strain field is confirmed by the different onset time delays in the preseismic tilt signals recorded at different distances from the same earthquake. In particular, the onset time delays observed at each tilt site appear to increase with increasing distance of such site from the epicentral area. At greatest distances, where the preseismic strain becomes negligible, the characteristic intermediate-term ground tilts vanish completely.

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“…2, see also Cello et al 1997;Barchi et al 2000;Boncio et al 2000). The faults belonging to this system, showing different kinematic behaviour and variable ages, include newly generated and reactivated features of the TyrrhenianApennines domain that formed during previous evolutionary stages in the long deformation history of the area (see Calamita et al 1994b;Cello et al 1997).…”

Section: Fault and Earthquake Datamentioning

confidence: 92%