Quantification of earthquake diagnostic effects to assess low macroseismic intensities

AbstractA large amount of data about earthquake effects, supplied by citizens through a web-based questionnaire, enabled the analysis of the occurrence of many of the effects on humans and objects listed in macroseismic scales descriptions. Regarding the other diagnostic effects (rattling, moving, shifting, falling or overturning depending of the object type of doors, windows, china, glasses, small objects, pictures, vases, books, as well as frightened people and animal behaviour), data from more than 300,000 questionnaires about earthquakes felt in Italy from June 2007 to August 2017, were analysed by stacking them together as a function of hypocentral distance and magnitude. The comparison of the resulting percentages with the intensity prediction equation showed that almost all the chosen effects are good diagnostics for macroseismic intensity evaluation, as their percentages are well differentiated. We did not analyse the oscillations of hanging objects and liquids because the differences in effect attenuations, highlighted by the maps of the occurrence percentage, suggested to not consider them as diagnostic effect. This result allowed us to quantify the occurrence of each diagnostic effect for the intensity degrees from II to VI of the European macroseismic scale for the people who felt the earthquake. The application of the intensity assessment method to internet macroseismic data, based on the specifications herein proposed, should mitigate the problem of "not felt" undersampling in crowdsourced web data

Time-Dependent Current-Density-Functional Theory of Spin-Charge Separation and Spin Drag in One-Dimensional Ultracold Fermi Gases

URL:http://link.aps.org/doi/10.1103/PhysRevLett.101.206402 DOI:10.1103/PhysRevLett.101.206402Motivated by the large interest in the nonequilibrium dynamics of low-dimensional quantum many-body systems, we present a fully microscopic theoretical and numerical study of the charge and spin dynamics in a one-dimensional ultracold Fermi gas following a quench. Our approach, which is based on time-dependent current-density-functional theory, is applicable well beyond the linear-response regime and produces both spin-charge separation and spin-drag-induced broadening of the spin packets.G. X. was supported by NSF of China under Grant No. 10704066 and by DOE Grant No. DE-FG02- 05ER46203. G.V. was supported by NSF Grants Nos. DMR-031368 and DMR-0705460

Terremoti probabili in Italia tra il 2000 e il 2030: elementi per la definizione di priorità per la riduzione del rischio sismico

The main purpose of Task 3.2 was to introduce the role of local geology in the seismic hazard evaluation at national scale. This was achieved by grouping the geological formation of the 1:500,000 Italian geological map into three classes A, B, C according to the EuroCode8 provisions (GCM, Geological-Class Map). These classes are associated to a variation of the ground motion due to the different seismic properties of the lithologies included in each group (ANNEX 1). For a critical evaluation of the proposed approach, we have checked the occurrence of a systematic increment of macroseismic intensity as a function of the geological classes at a national scale. The study of distribution of Intensity anomalies associated to the 3 classes show a statistical significant tendency of positive anomalies to be related to classes B and C and negative anomalies to be related to class A (ANNEX 2). We then assumed that the effect of local geology on ground motion is the one described by variation of elastic response spectra prescribed by EC8 (in terms of PGA, PSA, Housner Intensity). This variation is controlled by a set of parameters depending on the soil classes and earthquake magnitude (ANNEX 3). We compared the increment factors to those deriving from a numerical simulation of the Città di Castello (Central Italy) basin where many geological and seismological data were available. The results at local scale show a good fit (within a factor of two) with the variations of hazard parameters for classes B e C (ANNEX 4). Moreover, we launched a national-scale enquiry over the 8101 Italian Municipalities whose main goal was the estimation of the buildings distribution on the three soil classes corresponding to those of the CGM. We collected and organized the received forms in a database (see product 3). The comparison at a Municipality-scale of the GCM and the questionnaire results shows that their information is complementary, the first referring this percentage to the housing, the latter considering all the municipality territory (ANNEX 5). The questionnaire is a good data gathering tool for pointing out area where more detailed microzonation investigation must be performed. The questionnaire can be a powerful tool to increase awareness of Municipality Administration and the lack of involvement could be overcome by coordination at the Region levels. Products 1. National geologic map at 1:500,000 scale modified according to the EC8 soil classes (geological-class map, GCM) 2. Map of the geology-dependent correction of hazard parameters 3. Database of the Italian municipalities containing information about the distribution of buildings in relation to the surface geology as well as geographical and geotechnical data availability. The three products are organized in an attached CD and they are included in the GIS of the project.Gruppo Nazionale per la Difesa dai TerremotiUnpublished1.1. TTC - Monitoraggio sismico del territorio nazionaleope

Rojas: Reflexiones y datos para una estrategia de desarrollo

En este trabajo se hace una caracterización urbana, social y económica del partido de Rojas, determinando las dificultades y potencialidad para su desarrollo.Dirección de Asuntos Municipale

Rojas: Reflexiones y datos para una estrategia de desarrollo

En este trabajo se hace una caracterización urbana, social y económica del partido de Rojas, determinando las dificultades y potencialidad para su desarrollo.Dirección de Asuntos Municipale

Rojas: Reflexiones y datos para una estrategia de desarrollo

En este trabajo se hace una caracterización urbana, social y económica del partido de Rojas, determinando las dificultades y potencialidad para su desarrollo.Dirección de Asuntos Municipale

Spin-drag relaxation time in one-dimensional spin-polarized Fermi gases

Spin propagation in systems of one-dimensional interacting fermions at finite temperature is intrinsically diffusive. The spreading rate of a spin packet is controlled by a transport coefficient termed "spin drag" relaxation time $\tau_{\rm sd}$. In this paper we present both numerical and analytical calculations of $\tau_{\rm sd}$ for a two-component spin-polarized cold Fermi gas trapped inside a tight atomic waveguide. At low temperatures we find an activation law for $\tau_{\rm sd}$, in agreement with earlier calculations of Coulomb drag between slightly asymmetric quantum wires, but with a different and much stronger temperature dependence of the prefactor. Our results provide a fundamental input for microscopic time-dependent spin-density functional theory calculations of spin transport in 1D inhomogeneous systems of interacting fermions.Comment: 7 pages, 5 figure

Cañuelas: Plan Estratégico Participativo

Se presenta la Agenda del “Plan Estratégico Cañuelas”, desarrollado en 2001 por Convenio entre la UNLP y la Municipalidad de Cañuelas. En ese acto la Municipalidad presenta el Plan Estratégico Cañuelas (PEC) para impulsarlo y desarrollarlo en conjunto con la comunidad, con el objetivo de diseñar los caminos y acciones que posibiliten el desarrollo de todos los sectores de la comunidad. En ese camino, se organizan las siguientes actividades: Agosto 2000 / Marzo 2001 - Censo del Partido de Cañuelas. - Implementación del GIS. - Tarea conjunta de la Municipalidad de Cañuelas y la Universidad Nacional de la Plata. Abril 2001 - Presentación del censo y GlS - Lanzamiento del Plan Estratégico Cañuelas. Mayo 20C1 - Primera Etapa del PEC: - Constitución y funcionamiento de les comisiones de trabajo. El Plan se organiza en un proceso continuo de organización, participación y información, que promueve el proceso de movilización social.Dirección de Asuntos Municipale