Long short-term memory networks for earthquake detection in Venezuelan regions

Reliable earthquake detection and location algorithms are necessary to properly catalog and analyze the continuously growing seismic records. This paper reports the results of applying Long Short-Term Memory (LSTM) networks to single-station three-channel waveforms for P-wave earthquake detection in western and north central regions of Venezuela. Precisely, we apply our technique to study the seismicity along the dextral strike-slip Boconó and La Victoria - San Sebastián faults, with complex tectonics driven by the interactions between the South American and Caribbean plates.Peer ReviewedPostprint (author's final draft

Artificial neural networks as emerging tools for earthquake detection

As seismic networks continue to spread and monitoring sensors become more ef¿cient, the abundance of data highly surpasses the processing capabilities of earthquake interpretation analysts. Earthquake catalogs are fundamental for fault system studies, event modellings, seismic hazard assessment, forecasting, and ultimately, for mitigating the seismic risk. These have fueled the research for the automation of interpretation tasks such as event detection, event identi¿cation, hypocenter location, and source mechanism analysis. Over the last forty years, traditional algorithms based on quantitative analyses of seismic traces in the time or frequency domain, have been developed to assist interpretation. Alternatively, recentadvancesarerelatedtotheapplicationofArti¿cial Neural Networks (ANNs), a subset of machine learning techniques that is pushing the state-of-the-art forward in many areas. Appropriated trained ANN can mimic the interpretation abilities of best human analysts, avoiding the individual weaknesses of most traditional algorithms, and spending modest computational resources at the operational stage. In this paper, we will survey the latest ANN applications to the automatic interpretation of seismic data, with a special focus on earthquake detection, and the estimation of onset times. For a comparative framework, we give an insight into the labor of human interpreters, who may face uncertainties in the case of small magnitude earthquakes.Peer ReviewedPostprint (published version

Dragon-kings: mechanisms, statistical methods and empirical evidence

This introductory article presents the special Discussion and Debate volume "From black swans to dragon-kings, is there life beyond power laws?" published in Eur. Phys. J. Special Topics in May 2012. We summarize and put in perspective the contributions into three main themes: (i) mechanisms for dragon-kings, (ii) detection of dragon-kings and statistical tests and (iii) empirical evidence in a large variety of natural and social systems. Overall, we are pleased to witness significant advances both in the introduction and clarification of underlying mechanisms and in the development of novel efficient tests that demonstrate clear evidence for the presence of dragon-kings in many systems. However, this positive view should be balanced by the fact that this remains a very delicate and difficult field, if only due to the scarcity of data as well as the extraordinary important implications with respect to hazard assessment, risk control and predictability.Comment: 20 page

Applications of Geodesy to Geodynamics, an International Symposium

Geodetic techniques in detecting and monitoring geodynamic phenomena are reviewed. Specific areas covered include: rotation of the earth and polar motion; tectonic plate movements and crustal deformations (space techniques); horizontal crustal movements (terrestrial techniques); vertical crustal movements (terrestrial techniques); gravity field, geoid, and ocean surface by space techniques; surface gravity and new techniques for the geophysical interpretation of gravity and geoid undulation; and earth tides and geodesy

Psychosocial interventions in emergencies: theoretical models and their ethical and political implications in the Venezuelan context. The case of UNICEF.

This dissertation analyses of the models of psychosocial processes structuring psychosocial interventions after the emergencies. It presents a critical view on psychosocial models and the operation of the trauma discourse in society. The author discusses the ethical and political implications of psychosocial interventions in emergencies.This dissertation presents an analysis of the models of psychosocial processes structuring UNICEF’s psychosocial intervention after the emergency caused by the floods in Venezuela during 1999, and some of their political and ethical implications. I discuss how UNICEF’s intervention in the shelter of Fuerte Tiuna, in Caracas, provides a context in which discourses and practices construct the disaster as an event of a particular type, affording particular positions to those affected by it, and presenting the intervention as a reparative response that engages in different ways with these constructions. Specific issues explored by this dissertation include how practices and discourses construct the disaster and its impact on persons and communities; the nature of the psychosocial intervention; the subject; and the different forms of expertise involved in the intervention. Further, it examines how the intervention-as-designed is implemented and how the actual contact with the beneficiary population generates changes not only in the implementation itself, but also in the conceptual frameworks displayed by UNICEF. The analysis presents UNICEF’s psychosocial intervention as a practice that is simultaneously material and discursive. The participation of experts, the use of specific resources, the deployment of techniques and their devices, the organisation of time and space within the intervention, can all be considered as supporting certain notions of the disaster, its impact and its solution, which organise the models of the psychosocial. The main issues that appear as relevant for the analysis are related to the way in which the intervention constructs the disaster as a psychosocial problem; the appeal to the notion of trauma to explain the impact on those affected; the disciplinary, ethical and political implications of the different forms of understanding suffering in the Venezuelan contemporary context and how the notions put forward by UNICEF’s intervention engage with the social dynamics in Venezuela, in particular with the processes associated with the social and political polarisation.CONICIT Venezuela funded this PhD researc

Defense Technical Information Center thesaurus

This DTIC Thesaurus provides a basic multidisciplinary subject term vocabulary used by DTIC to index and retrieve scientific and technical information from its various data bases and to aid DTIC`s users in their information storage and retrieval operations. It includes an alphabetical posting term display, a hierarchy display, and a Keywork Out of Context (KWOC) display

Locating Zika

The emergence of Zika virus challenged conventional ideas of mosquito-borne diseases, tested the resilience of health systems and embedded itself within local sociocultural worlds, with major implications for environmental, sexual, reproductive and paediatric health. This book explores this complex viral epidemic and situates it within its broader social, epidemiological and historical context in Latin America and the Caribbean. The chapters include a diverse set of case studies from scholars and health practitioners working across the region, from Brazil, Venezuela, Ecuador, Mexico, Colombia, the United States and Haiti. The book explores how mosquito-borne disease epidemics (not only Zika but also chikungunya, dengue and malaria) intersect with social change and health governance. By doing so, the authors reflect on the ways in which situated knowledge and social science approaches can contribute to more effective health