Search results for "Earthquakes"

showing 10 items of 39 documents

Characterization of MEMS accelerometer self-noise by means of PSD and Allan Variance analysis

2017

In this paper, we have studied the sources of error of a low-cost 3-axis MEMS accelerometer by means of Power Spectral Density and Allan Variance techniques. These techniques were applied to the signals acquired from ten identical devices to characterize the variability of the sensor produced by the same manufacturer. Our analysis showed as identically produced accelerometer have somehow variable behavior in particular at low frequency. It is therefore of paramount importance before their use in Inertial Navigation or Earthquakes Monitoring System, a complete characterization of each single sensors.

Microelectromechanical systemsEngineering010504 meteorology & atmospheric sciencesbusiness.industrySpectral densityLow frequency010502 geochemistry & geophysicsAccelerometer01 natural sciencesCharacterization (materials science)AccelerationSettore ING-INF/04 - AutomaticaElectronic engineeringAllan varianceAccelerometers Micromechanical devices Standards Earthquakes Acceleration Monitoring Inertial navigationbusinessInertial navigation system0105 earth and related environmental sciences2017 7th IEEE International Workshop on Advances in Sensors and Interfaces (IWASI)
researchProduct

The ‘false vaults’ in the architecture of Sicily

2015

Between the end of the 17th century and the first decades of the 18th, Sicily was struck by several violent earthquakes. The total and partial collapse of monumental buildings produced a global debate involving various aspects of construction practice. One of the central topics of discussion was the construction of domes and large vaulted structures. Some architects studied the possibility of using so-called ‘false vaults’, a kind of lightweight structure created with a wooden frame, reed mats, and plaster. The technique was probably known by the 16th century and was used in a few major monuments, such as the dome of the Palermo Cathedral, in the mid-17th century. It was only after the Eart…

Settore ICAR/18 - Storia Dell'ArchitetturaSicily earthquakes ‘false vaults’ constructive techniques treatises Gagliardi
researchProduct

Joint second-order parameter estimation for spatio-temporal log-Gaussian Cox processes

2018

We propose a new fitting method to estimate the set of second-order parameters for the class of homogeneous spatio-temporal log-Gaussian Cox point processes. With simulations, we show that the proposed minimum contrast procedure, based on the spatio-temporal pair correlation function, provides reliable estimates and we compare the results with the current available methods. Moreover, the proposed method can be used in the case of both separable and non-separable parametric specifications of the correlation function of the underlying Gaussian Random Field. We describe earthquake sequences comparing several Cox model specifications.

spatio-temporal pair correlation functionEnvironmental EngineeringGaussianminimum contrast methodnon-separable covariance function010502 geochemistry & geophysics01 natural sciencesPoint processGaussian random fieldSet (abstract data type)010104 statistics & probabilitysymbols.namesakeCorrelation functionEnvironmental Chemistry0101 mathematicsSafety Risk Reliability and Qualityearthquakes0105 earth and related environmental sciencesGeneral Environmental ScienceWater Science and TechnologyParametric statisticsMathematicslog-Gaussian Cox processesEstimation theoryContrast (statistics)symbolsEarthquakes Log-Gaussian Cox processes Minimum contrast method Non-separable covariance function Spatio-temporal pair correlation functionSettore SECS-S/01 - StatisticaAlgorithm
researchProduct

An algorithm for earthquakes clustering based on maximum likelihood

2007

In this paper we propose a clustering technique set up to separate and find out the two main components of seismicity: the background seismicity and the triggered one. We suppose that a seismic catalogue is the realization of a non homogeneous space-time Poisson clustered process, with a different parametrization for the intensity function of the Poisson-type component and of the clustered (triggered) component. The method here proposed assigns each earthquake to the cluster of earthquakes, or to the set of independent events, according to the increment to the likelihood function, computed using the conditional intensity function estimated by maximum likelihood methods and iteratively chang…

business.industryPattern recognitionMaximum likelihood sequence estimationPoisson distributionPoint processPhysics::Geophysicssymbols.namesakeCURE data clustering algorithmsymbolsETAS model earthquakes point process clusteringArtificial intelligenceSettore SECS-S/01 - Statisticaclustering earthquakesCluster analysisLikelihood functionbusinessAlgorithmPoint processes conditional intensity function likelihood function clustering methodRealization (probability)k-medians clusteringMathematics
researchProduct

Post-disaster mental health and psychosocial support in the areas affected by the Great East Japan Earthquake: a qualitative study

2019

Background Few studies exploring the actual practices implemented for long-term mental health and psychosocial support after a natural disaster have been published. This study aimed to reveal (1) the types of activities that were actually provided as mental health and psychosocial support (MHPSS) in the long-term phase after the Great East Japan Earthquake (GEJE) and (2) the problems that must be addressed to provide post-disaster MHPSS activities. Methods An open-ended questionnaire was sent to organizations in the Iwate, Miyagi and Fukushima prefectures that were potentially involved in providing MHPSS to communities affected by the GEJE. The organizations were asked to describe their act…

AdultMaleMental Health ServicesMHPSSlcsh:RC435-571Poison controlSuicide preventionOccupational safety and healthDisasters03 medical and health sciences0302 clinical medicineJapanlcsh:PsychiatrySurveys and QuestionnairesEarthquakesHumans030212 general & internal medicineHuman resourcesNatural disasterQualitative Researchbusiness.industryPsychosocial supportSocial SupportHuman factors and ergonomicsPublic relationsMental health030227 psychiatryLong-term after a disasterPsychiatry and Mental healthMental HealthDisasterFemalebusinessPsychologyResearch ArticleQualitative research
researchProduct

Stochastic seismic analysis of multidegree of freedom systems

1984

Abstract A unconditionally stable step-by-step procedure is proposed to evaluate the mean square response of a linear system with several degrees of freedom, subjected to earthquake ground motion. A non-stationary modulated random process, obtained as the product of a deterministic time envelope function and a stationary noise, is used to simulate earthquake acceleration. The accuracy of the procedure and its extension to nonlinear systems are discussed. Numerical examples are given for a hysteretic system, a duffing oscillator and a linear system with several degrees of freedom.

Stochastic processMathematical analysisLinear systemDegrees of freedom (statistics)stochastic analysisDuffing equationAcceleration (differential geometry)earthquakes; probability theory; stochastic analysisSeismic analysisNonlinear systemEarthquake simulationControl theoryprobability theoryearthquakesCivil and Structural EngineeringMathematics
researchProduct

Models and methods for space and space-time interactions in complex point processes with applications on earthquakes

spatial covariatespatial point processeearthquakes; hybrids of Gibbs point processes; spatial covariates; spatial point processes; hypothesis testing; local indicators of spatio-temporal association; permutation-based tests; second-order product density function; log-Gaussian Cox process; spatial anisotropy; spatio-temporal point process; clustering detectionlog-Gaussian Cox proceearthquakehybrids of Gibbs point processehypothesis testinglocal indicators of spatio-temporal associationpermutation-based testspatial anisotropysecond-order product density functionspatio-temporal point proceSettore SECS-S/01 - Statisticaclustering detection
researchProduct

Search without rescue? Evaluating the international search and rescue response to earthquake disasters

2020

Earthquakes around the world are unnecessarily lethal and destructive, adversely affecting the health and well-being of affected populations. Most immediate deaths and injuries are caused by building collapse, making search and rescue (SAR) an early priority. In this review, we assess the SAR response to earthquake disasters. First, we review the evidence for the majority of individuals being rescued locally, often by relatives and neighbours. We then summarise evidence for successful live rescues by international SAR (ISAR) teams, along with the costs, ethics and other considerations of deployment. Finally, we propose an alternative approach to postdisaster ISAR, with the goal of reducing …

010504 meteorology & atmospheric sciencesprevention strategies0211 other engineering and technologiesenvironmental health02 engineering and technology01 natural sciencesBuilding collapselcsh:Infectious and parasitic diseasesDisastersEarthquakesRescue WorkHumanshealth economicslcsh:RC109-2161506Health policySearch and rescueRetrospective StudiesOriginal Research0105 earth and related environmental scienceslcsh:R5-920021110 strategic defence & security studiesHealth economicsHealth PolicyPublic Health Environmental and Occupational HealthPeer reviewCross-Sectional StudiesRisk analysis (engineering)Software deploymentCase-Control StudiesepidemiologyBusinesslcsh:Medicine (General)VDP::Samfunnsvitenskap: 200::Urbanisme og fysisk planlegging: 230BMJ Global Health
researchProduct

Psychometric properties of the Haitian Creole version of the Resilience Scale with a sample of adult survivors of the 2010 earthquake

2015

Abstract Background Resilience is defined as the ability of people to cope with disasters and significant life adversities. The present paper aims to investigate the underlying structure of the Creole version of the Resilience Scale and its psychometric properties using a sample of adult survivors of the 2010 earthquake. Methods A parallel analysis was conducted to determine the number of factors to extract and confirmatory factor analysis was performed using a sample of 1355 adult survivors of the 2010 earthquake from people of specific places where earthquake occurred with an average age of 31.57 (SD = 14.42). All participants completed the Creole version of Resilience Scale (RS), the Imp…

AdultMaleGerontologyAdolescentPsychometricslcsh:RC435-571media_common.quotation_subjectPoison controlDisastersStress Disorders Post-TraumaticYoung AdultSocial supportHaitian CreoleCronbach's alphalcsh:PsychiatrySurveys and QuestionnairesEarthquakesHumansSurvivorsAgedmedia_commonAged 80 and overPsychiatric Status Rating ScalesDepressionBeck Depression InventorySocial SupportConstruct validityMiddle AgedResilience PsychologicalHaitilanguage.human_languageConfirmatory factor analysisPsychiatry and Mental healthClinical PsychologylanguageFemalePsychological resiliencePsychologyClinical psychologyComprehensive Psychiatry
researchProduct

Mixed estimation technique in semi-parametric space-time point processes for earthquake description

2013

An estimation approach for the semi-parametric intensity function of a particular space-time point process is introduced. In particular we want to account for the estimation of parametric and nonparametric components simultaneously, applying a forward predictive likelihood to semi-parametric models. For each event, the probability of being a background event or one belonging to a seismic sequence is therefore estimated.

point proceNonparametric estimationSettore SECS-S/01 - Statisticaforward predictive likelihoodearthquakesETAS model
researchProduct