756 research outputs found
Estimates of Vs30 Based on Constrained H/V Ratio Measurements Alone
No full text"One more use of H/V of microtremors is described by S. Castellaro and F. Mulargia. They propose a method to infer the ever-needed Vs 30 by fitting the observed H/V spectrum to the theoretical one computed under assumption taht noise wavefield is composed of the fundamental mode Rayleigh waves. The authors find their technique superior and more informative than all popular array methods, allowing detection of deviations from 1-D subsoil geometry over lengths of a few meters!" (CASSIDY J., MUCCIARELLI M., HERAK M. 8eds.), Increasing Seismic Safety by Combining Engineering Technologies and Seismological Data, p.2
Preface to the special issue on man-made seismicity in Italy
Full text linkUntil a few years ago, Italy suffered from a deep lack of publicly shared knowledge about induced seismicity, compared to many other countries. No public data were available to perform scientific studies of the phenomenon, and the few papers published from 1964 to 2004 came from in-house operations of private companies
(Mucciarelli, 2013)
Uncertainty in PSHA related to the parametrization of historical intensity data
Full text linkIn recent times a great deal of research aimed to reduce of
uncertainties in probabilistic seismic hazard analysis (PSHA). Most attention
was paid to the role of ground motion prediction equations (GMPEs; see, e.g.,
Strasser et al., 2009), while no studies were devoted to a possible larger
source of uncertainties: the historical catalogues of earthquakes.
In areas where historical catalogues provide a record many centuries long and
surface geology does not permit us to obtain complete catalogues of
seismogenic faults at the moment, their use is unavoidable for estimating seismicity rates
required for PSHA. Their use is also gaining popularity as an independent
tool for the estimation of PSHA (D'Amico and Albarello, 2008) and for validation purposes (Stirling and Petersen, 2006; Mucciarelli et al.,
2008).
After proposing an alternative parametrization of historical
macroseismic intensity, this paper is devoted to discussing what the real impact of starting uncertainties in intensities
on the final uncertainties in PSHA is
Le soverchie spese dei litiganti. Sulla malitia degli iudices e i costi dei processi (Siena nel Trecento)
No full textSul caso di studio selezionato e facendo leva su documentazione inedita, il saggio analizza i costi che i cives dovevano sostenere per presentarsi in tribunale; il tema della "giustizia per tutti" che ebbe larga eco nei programmi politici dei governi di popolo dell'Italia centro settentrionale, vieni qui messo alla prova grazie all' analisi delle voci di spesa dichiarate dai litiganti ed approvate poi dal giudice attraverso il procedimento di "taxatio". La crescita dei costi processuali, durante il XIV secolo, è fenomeno noto alla storiografia che ne ha diversamente interpretato cause e conseguenze. A Siena acquisisce un significato politico di indubbia rilevanza legandosi alla polemica coeva agitata contro il ceto degli "iudices", accusati di estorsione e corruzione dal gruppo dirigente
Il priorato nazaretano del Regno di Sicilia in un problematico documento datato 1162: appunti per una riflessione
No full textIl contributo propone la riedizione di un documento datato Barletta 1162, collazionata con le due edizioni precedenti, relativo al patrimonio dell'arcidiocesi di Nazareth nel Regno di Sicilia e alla sua formazione
Are different M = a + bI0 relationships due to a statistical bias?
No full textRelationships between magnitude and macroseismic intensity are widely used, even though intensity is a non-metric observable. Several proposed relationships for the Italian and surrounding regions show a significant correlation of the parameters of the widely used functional form M = a + bI0 This could suggest either the common dependence on a third variable or that the different proposed relationships are due to a pivotal phenomenon around average values, mainly driven by data sampling and uncertainties. Synthetic simulations lend support to the last hypothesis
Effect of Vibrating Buildings on Free-Field Motion and on Adjacent Structures: The Bonefro (Italy) Case History
No full textDuring the 2002 Molise sequence, a shock was recorded in a building that suffered heavy damage (Mucciarelli et al., 2004). The availability of this data, along with other similar data, led to the organization of an international workshop for structural engineers aimed at the reproduction of the staged evolution of damage observed (A. Goretti and M. Mucciarelli, unpublished manuscript, 2007). The aim of this present work is to model the damaged building; the adjacent, less damaged building; and a large section of the subsoil. The model should provide some insight into two possible phenomena: (1) the soil–structure interaction (SSI), that is, the modification of the free-field seismic response induced by the presence of the buildings located on soft soil; and (2) the possible interaction between the two buildings. The study was performed using the 2D Chebyshev spectral element method (SPEM) for a 2D section. The model, with topography, includes the bedrock (limestone) with the overlaying clay layer, circa 30 m. The building is modeled by an equivalent shearwave velocity, which is calculated from its identified mechanical properties. First, the model’s ability to reproduce the motions recorded inside and outside the building was verified. Then, one or both of the buildings were removed to study their effect. The influence of the presence of buildings on the free-field motion is about 40% on spectral values, and it is felt up to a distance of about 250 m from the buildings. The results also suggest the presence of resonance between buildings
La lingua di Nacarino. Su delazioni e delatori nell'Italia comunale (Siena, XIII-XIV secolo)
No full textIl saggio analizza l'uso a fini politici e di disciplinamento sociale della denunzia anonima e segreta nei regimi politici repubblicani italiani, focalizzando precipuamente l'attenzione sul caso di studio offerto da Siena durante i secoli XIII e XIV. Il tema della delazione viene qui svolto entro la più ampia cornice tematica e problematica dell'uso del "segreto" nello spazio politico dell'Italia medievale: oggetto storiografico noto e complesso che, come dice la sua etimologia, opera sempre in senso selettivo azionando processi di inclusione e di esclusione, rapporti di forza e dinamiche di potere. L'ipotesi dell'autrice e curatrice del volume è che esso sia una leva fondamentale nella costruzione del pubblico. A partire da questa ipotesi, il saggio proposto cerca di afferrarne alcune traiettorie verificando i tempi e i modi in cui i regimi politici costruirono e legittimarono, a partire dal secondo Duecento, età di affermazione dei regimi di popolo, la denunzia anonima e segreta per reprimere una amplissima gamma di reati: dal reato "amministrativo" fino ai quelli ben più gravi di natura politica (corruzione, falsum, congiure). Un'arma ambigua e a doppio taglio che ben si prestava ad essere manipolata e pretestuosamente impiegata proiettando sullo spazio sociale un'ombra temibile: la disarticolazione delle reti solidali e della coesione basata sulla fides e l' aggressione alla "bona fama" ne furono gli effetti più macroscopici.The essay analyzes the use for political and social disciplinary purposes of anonymous and secret denunciation in Italian republican political regimes, focusing primarily on the case study offered by Siena during the thirteenth and fourteenth centuries. The theme of the denunciation is here developed within the broader thematic and problematic framework of the use of the "secret" in the political space of medieval Italy: a well-known and complex historiographical object which, as its etymology says, always operates in a selective sense, activating processes of inclusion and exclusion, power relations and power dynamics. The hypothesis of the author and curator of the volume is that it is a fundamental lever in the construction of the public. Starting from this hypothesis, the proposed essay tries to grasp some trajectories by verifying the times and ways in which political regimes built and legitimized, starting from the second thirteenth century, the age of affirmation of people's regimes, the anonymous and secret denunciation to repress a very wide range of crimes: from "administrative" crimes to much more serious ones of a political nature (corruption, falsum, conspiracies). An ambiguous and double-edged weapon that lent itself well to being manipulated and spuriously used, casting a fearful shadow on the social space: the disruption of solidarity networks and cohesion based on fides and the aggression to "bona fama" were the most significant effects
Are different M = a + bI0 relationships due to a statistical bias?
No full textRelationships between magnitude and macroseismic intensity are widely used, even though intensity is a non-metric observable. Several proposed relationships for the Italian and surrounding regions show a significant correlation of the parameters of the widely used functional form M = a + bI0 This could suggest either the common dependence on a third variable or that the different proposed relationships are due to a pivotal phenomenon around average values, mainly driven by data sampling and uncertainties. Synthetic simulations lend support to the last hypothesis.JCR Journalope
Exclusion of US-holders in cross-border takeover bids and the principle of equality in tender offers
Full text linkTo avoid the cumulative application of takeover regulation of more jurisdictions, it is common practice to exclude from the offer shareholders resident in countries adopting extraterritorial conflict rules. Among such countries, the most significant case is that of US securities regulation: according to US case-law, in order to avoid the application of US takeover regulation and anti-fraud provisions, bidders should completely exclude any publicity of the offer in the US or to US resident and consider acceptances from US residents as void. However, such restrictions could be at odds with the principle of equal treatments of target’s shareholders, provided for by the EU Takeover Directive. In the paper, I argue that only restrictions to dissemination could be reconciled with the equality principle. On the contrary, restrictions to acceptance represent a clear violation of such principle, which can be admitted only if the cumulative application of US law would make the offer unfeasible
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