Publications Evaluación de Riesgo Sísmico para Santiago de los Caballeros Share Facebook LinkedIn Download 2022 | Report El presente documento es el resultado del esfuerzo colaborativo entre la Fundación GEM, el Servicio Geológico de los Estados Unidos, la oficina del Plan de Ordenamiento Territorial del Ayuntamiento de Santiago de los Caballeros y el Servicio Geológico Nacional. El objetivo de este reporte es presentar los resultados de la evaluación de riesgo urbano para el municipio de Santiago de los Caballeros, obtenidos dentro del contexto del Proyecto para la Comunicación y Formación en la Evaluación de Riesgos por Terremotos (TREQ), financiado por la Oficina de Ayuda Humanitaria de los Estados Unidos (BHA, por sus siglas en inglés).

Publications GEM1 Executive Summary Share Facebook LinkedIn Download 2010 | Report The Global Earthquake Model (GEM) is a public/private partnership initiated and approved by the Global Science Forum of the Organisation for Economic Co-operation and Development (OECD-GSF). GEM aims to provide uniform, independent standards to calculate and communicate earthquake risk worldwide. With committed backing from academia, governments, and industry, GEM will contribute to improved modelling of earthquake risk worldwide. More information is available on the GEM website: www.globalquakemodel.org. As a first step in developing a global earthquake model, a focused pilot project named GEM1 was launched to generate GEM’s first products and develop GEM’s initial IT infrastructure. GEM1 formally started in January 2009 and ended on March 31st 2010, whilst ETH Zurich was appointed as the coordinator, with EUCENTRE (Italy), GFZ (Germany), NORSAR (Norway) and the USGS (USA) as contributing partners (and a number of other institutions and individuals, named in the companion reports, also provided models, data and feedback). The main objective of GEM1 was that it would provide a basis upon which the future development of the full GEM computing environment and product set could be built. The aim as spelled out in the GEM1 implementation plan was to largely use existing tools and datasets in hazard and risk, connected through a unified IT infrastructure. The GEM1 deliverables are therefore to be considered ‘proof-of-concept’ rather than final products, hence any resulting outputs should be conceived as conceptual only and are thus not suitable for application. This report briefly summarizes the achievements of GEM1.

Publications User guide Geospatial tools for building footprint and homogenous zone extraction from imagery Share Facebook LinkedIn Download 2014 | User manual Thisreportdescribes the tools required toextractbuildinginformation from remotely-sensed satelliteand aerialimagery.Itprovidesastep-by-stepuserguideforasetofopen-sourcesoftwaretoolsforgenerating data for the Global Exposure Database. IDCT has proposed an expansive suite of tools for inventory and damage data collection. The opens source image processing and GIS software, Quantum GIS (QGIS) and GRASS provide the core functionality for pre-processing imagery. Algorithms for automatically extracting building footprints are provided as a plug-in toolbar to QGIS. These have evolved from the Building RECognitiontool (BREC),developedbytheUniversityofPavia,andhavebeencustomisedforuseintheIDCT suite. Protocols formodifying GIS information are also provided. For regional exposure development, and generating information for use in mapping schemes, areas of homogenous land use can be manually extracted.ThiscanalsobeachievedinQGIS,howevertheuseofGoogleEarthforgeneratingthesedataare alsodescribed.

Publications Earthquake early warning for Portugal: part 2 – where is it beneficial? Share Facebook LinkedIn Download 2023 | Peer-reviewed An earthquake early warning system (EEWS) can provide valuable alerts before the destructive seismic waves arrive. This warning time can allow the adoption of protective measures by the population, which can translate into reduced casualties and economic savings. In the last centuries, Portugal was struck by several strong earthquakes (e.g., 1755 M ~ 8.5 Lisbon, 1969 M7.8 Algarve), whose magnitude and epicentre might allow large warning times. In this study, a probabilistic seismic hazard analysis (PSHA) model was used to generate a large stochastic event set for mainland Portugal, and the expected human impact (i.e., fatalities and injured) were estimated for each seismic event with and without the consideration of an EEWS. We evaluated different options for the reduction in the casualties considering the duration of the warning time, human reaction time, and the size of the buildings. The potential reduction in the human impact was converted into an economic benefit considering hospitalization costs and the statistical value of a human life in Portugal. The results indicate that such a system could significantly reduce the human and related economic losses in the Southwest of the country.

News TREQ Project Updates: Site Effects Modelling and Urban Exposure Models By: Jun 3, 2021 Share Facebook LinkedIn Site Effects Modelling and Urban Exposure Models Over the past year, TREQ has made significant progress in the risk and hazard assessment for the selected cities: Santiago (Dominican Republic), Quito (Ecuador) and Cali (Colombia). This includes compiling and preparing existing PSHA models for hazard calculations; and the development of detailed exposure and vulnerability models. Urban Hazard Assessment For Santiago de los Caballeros, Dominican Republic, the project team worked with local experts from the National Geological Survey (SGN) and the Autonomous University (UASD) at compiling, reviewing, and preparing a new seismic catalogue to be used in hazard calculations for Hispaniola. The team has also prepared the national database of active faults, using the information compiled in the CCARA project and additional information provided by SGN (i.e. data and reports). The project is now using the catalogue and fault data to construct the national probabilistic seismic hazard model for the Dominican Republic. A preliminary version has been completed, and construction of the final model is underway. For Cali, Colombia, the project improved the national model proposed by Arcila et al. (2020) by adding a new fault located underlying the city (i.e. Cauca-Cali-Patia fault), consistent with the seismic zonations used in the microzonation study for Cali (Ingeominas-Dagma, 2005), and the Colombian building code (AIS, 2009). For Quito, Ecuador, the project selected the model of Beauval et al. (2018), composed of shallow and subduction seismic sources characterized using an ISC-based catalogue and active shallow fault sources considering geodetic slip-rates assuming a 50% of aseismic slip. Now, the project is consolidating the available geological, geophysical, and geotechnical data for each of the three cities needed to compute site-response (amplification of ground shaking in surficial sediments (or soil) during an earthquake). Future versions of the OpenQuake engine will support the calculation of site response through detailed site/soil amplification functions and their corresponding uncertainty. Urban Risk Assessment GEM has already developed exposure datasets at the subnational level in the Dominican Republic, Colombia and Ecuador. However, the risk assessment activities planned within the context of TREQ require exposure datasets at urban scale. To this end, GEM has focused on the development of high-resolution exposure models. These have been established with support from the municipal governments in each city, namely, Oficina de Planeamiento Territorial (Santiago de los Caballeros), Oficina de Planeación y la Secretaría de Gestión del Riesgo de Emergencias y Desastres (Cali), and Dirección Metropolitana de Gestión del Riesgo (Quito). The exposure models were developed using dedicated databases from each city. These databases include the most recent information from the census, cadaster, and urban planning offices. As a result, they feature better estimates for the number of occupants, building counts, replacement costs and vulnerability classification of structures. In close collaboration GEM and the USGS are validating the exposure models by means of assessing the potential impacts of earthquake scenarios at a neighborhood level. The objective is to use recorded/estimated damage and economic losses from relevant historical scenarios to assess the accuracy of the exposure and hazard model data. The risk metrics that are being analyzed in each city include building damage, economic losses and fatalities. No images found. GALLERY 1/0 Gallery VIDEO RELATED CONTENTS

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Publications Executive summary Urban seismic risk assessment for the cities of Quito, Cali and Santiago de los Caballeros Share Facebook LinkedIn Download 2022 | Report This seismic risk component at urban level covers the development of uniform, open and transparent datasets for the urban building inventory (exposure model), the physical response of the infrastructure under seismic loads (vulnerability model), and the assessment of the impact from earthquakes, along with risk metrics required for the development of risk reduction plans.

Publications Probabilistic Seismic Hazard Analysis (PSHA) Training Manual Share Facebook LinkedIn Download 2021 | User manual An example-based guide to building PSHA models using open-source data and tools.

Publications GEM1 report on the review of probabilistic seismic hazard analysis (PSHA) software as a basis for development of the OpenQuake Engine Share Facebook LinkedIn Download 2010 | Report The present report reviews a set of probabilistic seismic hazard analysis (PSHA) computer programs (CRISIS, EQRM, NSHMP, OpenSHA, and SEISHAZ) proposed as possible platforms for the development of the GEM1’s hazard engine. The analysis is supplemented by including a number of additional software (FRISK88M, MoCaHAZ, MRS, OHAZ, and SEISRISK IIIM) considered important to obtain a more comprehensive understanding of the current state-of-the-art in PSHA. The report is organized into two sections. The first describes the main properties of each PSHA program on the technical (e.g. the programming language) and scientific level (e.g. the PSHA source typologies supported). The second illustrates, for a subset of the selected software, a simple benchmarking exercise aimed at understanding the behaviour of the programs, and to compare the results provided for very simple cases. The review of the selected PSHA software proved to be a very useful exercise to delineate the desirable properties for the GEM1 seismic hazard engine and shows that OpenSHA can accommodate the GEM1 IT and hazard specifications better than the other evaluated software.

Publications Seismic Hazard Results (rock and soil conditions) Share Facebook LinkedIn Download 2021 | Report Description of the hazard results on rock and soil for the three cities in the urban hazard assessment component of TREQ.