geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Damage and ground shaking in the town of Nocera Umbra during Umbria-Marche, central Italy, earthquakes; the special effect of a fault zone


, : Damage and ground shaking in the town of Nocera Umbra during Umbria-Marche, central Italy, earthquakes; the special effect of a fault zone. Bulletin of the Seismological Society of America 91(3): 511-519

On 26 September 1997, the town of Nocera Umbra, central Italy, was strongly hit by two nearby M (sub L) 5.6 and 5.8 earthquakes. The effects were particularly heavy in the historical part of the town, on the top of a 120-m-high hill. However, also modern zones along the Topino valley suffered severe damage with many partial collapse episodes. Aftershock recordings in different zones stressed the occurrence of large variations of the ground-motion strength within the town. These observations suggest that the spatially heterogeneous distribution of damage in Nocera Umbra should have been a combination of variations of both building vulnerability and ground shaking intensity within the town. We have identified six microzones characterized by different vulnerability and/or varying geological and topographical conditions. In each of them, the number of damaged houses is computed for vulnerability types A, B, and C according to the European Macroseismic Scale 1998 (EMS-98). This procedure yields a macroseismic intensity of VII-VIII on the hill in the historical part of the town. In this zone, the topography amplification has a limited extent while the quality of the construction materials is poor; the diffuse damage is then interpreted as an effect of the higher vulnerability of buildings in the historical zone. The other urbanized zones of Nocera Umbra are composed of more recent, less vulnerable buildings. In spite of the almost homogeneous building vulnerability, the observed damage grades show significant variations between the remaining five microzones. In particular, damage grades related to intensity as low as VI-VII were assessed for undisturbed Mesozoic limestone and stiff Cenozoic-Mesozoic marly sandstone zones, where aftershock seismograms show the smallest relative amplitudes. The highest damage grades (related to intensity VIII) were estimated for two zones, on the soft sediment deposits in the Topino River valley and on the fractured marly sandstone terrains within a 200-m-wide fault zone crossing the town of Nocera Umbra. Such an increment of one to two degrees in EMS intensity corresponds to a maximum spectral amplification of horizontal ground motion around 4 Hz that is as large as 20 on the soft sediment deposits and even larger within the fault zone.

US$19.90

DOI: 10.1785/0120000114


Other references

Chlouverakis C.; Schnatz J.D., 1972: Contribution of diet to the hyper tri glyceridemia of streptozotocin diabetes. Diabetes 21(SUPPL 1): 353-354

Holtz A.; Nystrom B.; Gerdin B., 1990: Effect of methylprednisolone on motor function and spinal cord blood flow after spinal cord compression in rats. The effect of methylprednisolone (MP) on neurologic recovery and spinal cord blood flow (SCBF) was investigated up to 4 days after a spinal cord compression injury in rats. The injury was produced at midthoracic level by applying a load of 35 g on...

Frame, M.D.; Dewar, A.M.; Mullick Chowdhury, S.; Sitharaman, B., 2014: Vasoactive effects of stable aqueous suspensions of single walled carbon nanotubes in hamsters and mice. Single-walled carbon nanotubes synthesized with iron (Fe-SWCNT) or gadolinium (Gd-SWCNT) show promise as high performance multimodal contrast and drug-delivery agents. Our purpose was to evaluate potential vasoactive effects of SWCNT. Stable aqueo...

Campos, S.B.; Hosford, M.; Sandoval, R.M.; Wean, S.E.; Molitoris, B.A., 2003: Cytokine induced F-actin formation and reorganization in MS-1 endothelial cells involves cofilin inactivation. Journal of the American Society of Nephrology 14(Abstracts Issue): 159A, November

Jiang, B.; Walstab, J.; Reid, S.M.; Davis, E.; Reddihough, D., 2016: Quality of life in young adults with cerebral palsy. Little is known about the quality of life (QOL) of young adults with cerebral palsy. This cross-sectional analysis compares the QOL of a cohort of young Australian adults with CP with a cohort of able-bodied peers to explore the relationship betwe...

Hans, D.; Genton, L.; Drezner, M.K.; Schott, A.M.; Pacifici, R.; Avioli, L.; Slosman, D.O.; Meunier, P.J., 2002: Monitored impact loading of the hip: initial testing of a home-use device. Many studies have been done involving exercise, impact loading, and the effect on BMD. In some of these studies, particularly those involving outpatient activity, compliance and the specific parameters of an individual's impact loading have b...

Kratz, A.; Lewandrowski, K.B.; Siegel, A.J.; Sluss, P.M.; Chun, K.Y.; Flood, J.G.; Lee-Lewandrowski, E., 2003: Effect of marathon running on total and free serum prostate-specific antigen concentrations. Context.-Prostate-specific antigen (PSA) is an important tumor marker for the most frequently diagnosed cancer in the United States. A major limitation of this marker is falsely elevated results in patients who are found not to have prostate cance...

Freĭerov, O.E., 1971: Oligophrenia complicated by a psychopathic personality in forensic psychiatry. Sudebno-Meditsinskaia Ekspertiza 14(3): 46-51

Chen, Z.; Vohidov, F.; Coughlin, J.M.; Stagg, L.J.; Arold, S.T.; Ladbury, J.E.; Ball, Z.T., 2012: Catalytic protein modification with dirhodium metallopeptides: specificity in designed and natural systems. In this study, we present advances in the use of rhodium(II) metallopeptides for protein modification. Site-specific, proximity-driven modification is enabled by the unique combination of peptide-based molecular recognition and a rhodium catalyst...

Walsdorf, N.B.; Alexandrides, G.; Pak, C.Y.C., 1995: Method for increasing urinary excretion of electrolytes. Official Gazette of the United States Patent & Trademark Office Patents 1176(2): 1163, July 11