103 research outputs found
Seismic ground motion estimates for the M 6.1 earthquake of July 26, 1963 at Skopje, Republic of Macedonia
No full textThe 9 October 1963 Vajont Catastrophe from the Point of View of the WWSSN-LP Recordings of the TRI-117 Station, Trieste, Italy
No full textIn this study, we analyze the seismic signal generated by the 1963 Vajont catastrophic landslide recorded at the Worldwide Standardized Seismographic Station Network- Long Period station of Trieste (Italy). The landslide (nearly 260–270 million m3) invaded an artificial reservoir designed for electrical production, and generated a 220 m high wave that flowed over the dam and claimed the lives of approximately 2000 people. The original seismograms have been digitized and analyzed using time–frequency tools and numerical simulations. The results indicate that a seismic signal comparable to that generated by an Ms 3.7 earthquake was generated by the landslide. Furthermore, the calculatednearly2×1014 Joffrictionalenergy,consideringtheknownparameterofthe mass movement, is compatible with a friction coefficient of 0.29, in excellent agreement with the values from previous studies. The seismic efficiency that we calculate (1:12 × 10−4 –4:45 × 10−4 ), also taking into account available data on the landslide, is within the range of values previously noted in literature. Finally, via the numerical sim- ulations and adopting an ad hoc crustal model for the area, the origin time of the event is estimated at 21 hr 41 min 42 s UTC. The results confirm the importance of the re-analy- sis of analog seismograms with modern tools within a multihazard context
Claudine Lautier et Dany Sandron (dir.), Antoine de Pise. L’art du vitrail vers 1400
No full textCompte-rendu de : C. Lautier & D. Sandron (dirs.), Antoine de Pise. L’art du vitrail vers 1400 (Corpus Vitrearum France, série « études », 8), Paris, éditions du CTHS, 2008
La tete de Naples: le salut de l'âme et du corps. Un cas de remploi au fil des siécles du lieu plus élevé de la ville ancienne
No full textIl saggio approfondisce le vicende della collina di Caponapoli, della sua storia urbana, ma soprattutto del suo ruolo all'interno di una geografia immaginaria e mistica della città di Napoli.The essay explores the events of the Caponapoli hill, its urban history, but above all its role within an imaginary and mystical geography of the city of Naples
Stime dello scuotimento in tempo reale e quasi-reale per terremoti significativi nell’area delle Alpi Sud-Orientali.
No full textMappe di scuotimento del suolo in tempo reale e quasi-reale nell’area delle Alpi Sud Orientali: calibrazione e validazione.
No full textMapping long-period soil resonances in the Kathmandu basin using microtremors
No full textThis study reports the geostatistical analysis of a set of 40 single-station horizontal-to-vertical spectral ratio (HVSR) passive seismic survey data collected in the Kathmandu basin (Nepal). The Kathmandu basin is characterized by a heterogeneous sedimentary cover and by a complex geo-structural setting, inducing a high spatial variability of the bedrock depth. Due to the complex geological setting, the interpretation and analysis of soil resonance periods derived from the HVSR surveys is challenging, both from the perspective of bedrock depth estimation as well as of seismic-site effects characterization. To exploit the available information, the HVSR data are analyzed by means of a geostatistical approach. First, the spatial continuity structure of HVSR data is investigated and interpreted taking into consideration the geological setting and available stratigraphic and seismic information. Then, the exploitation of potential auxiliary variables, based on surface morphology and distance from outcropping bedrock, is evaluated. Finally, the mapping of HVSR resonance periods, together with the evaluation of interpolation uncertainty, is obtained by means of kriging with external drift interpolation. This work contributes to the characterization of local seismic response of the Kathmandu basin. The resulting map of soil resonance periods is compatible with the results of preceding studies and it is characterized by a high spatial variability, even in areas with a deep bedrock and long resonance periods
Vertical ground motion in near field
No full textTwo questions have puzzled seismologists in the past: if vertical peak accelerations could exceed the horizontal ones and if vertical peaks exceeding 1 g were feasible in the near field. Recordings of vertical accelerations larger than 1 g are very rare, only 7 so far (according to the Strong Motion Virtual Data Center, see Table 1). This is mainly due to the scarce availability of recorders located in the near field (d0.7 s)
Ground Shaking Scenarios: The 8 September 1905 Earthquake in the Gulf of Sant’Eufemia, Offshore Western Calabria (Southern Tyrrhenian Sua, Italy)
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