3 results on '"Balan, Stefan Florin"'
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2. Characteristics And Results Of The Near Real-Time System For Estimating The Seismic Damage In Romania
- Author
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Manea Elena Florinela, Cioflan Carmen Ortanza, Balan Stefan Florin, and Toma-Danila Dragos
- Subjects
selena ,seismic risk ,loss assessment ,Seismic damage ,TA1-2040 ,Engineering (General). Civil engineering (General) ,Geology ,Seismology - Abstract
The Near Real-Time System for Estimating the Seismic Damage in Romania, implemented in 2012 at the National Institute for Earth Physics, is one of the automated systems that can directly contribute to saving many lives right after a major earthquake, by translating earthquake parameters into damage probabilities for different areas within Romanian counties and showing emergency intervention necessities, and can also lead to mitigation actions before an earthquake, through raising awareness and highlighting vulnerable aspects of the building stock and economic and social impacts. This paper aims to present the scientific background of this constantly upgrading system, and to show different results for relevant scenarios, for intermediate-depth Vrancea earthquakes and other crustal earthquakes. Several important questions are tried to be answered, like: “How credible are the estimated losses?”, “What are the most vulnerable aspects?” or “How can the damage maps be useful for authorities?”. Currently, the system uses for building loss estimation the analytical methods (as the Improved-Displacement Capacity Method - I-DCM) implemented within the open-source software SELENA (SEismic Loss EstimatioN using a logic tree Approach), together with HAZUS methods for estimating the human casualties. The building stock is defined through 48 different capacity and fragility curves, depending on construction material, height and age. As hazard data, PGA and SA values obtained through the ShakeMap System and based on real recordings and attenuation relations are used. The area currently analyzed by the system consists of 19 Romanian Counties, capital Bucharest and 9 regions in northern Bulgaria; resolution of the data is at administrative unit (commune or city) level. We aim to provide an insight of each part of this system, justify the choices made and also discuss the improvement possibilities.
- Published
- 2015
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3. BUILDINGS SAFETY THROUGH SATELLITE MONITORING.
- Author
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Balan, Stefan Florin, Poncos, Valentin, Teleaga, Delia, Toma, Stefan-Adrian, and Apostol, Bogdan Felix
- Subjects
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BUILDINGS safety measures , *NATURAL satellites , *NUCLEAR power plants , *MUNICIPAL government , *ENVIRONMENTAL physics , *EARTHQUAKE hazard analysis - Abstract
During the ongoing project "Spaceborne Multiple Aperture Interferometry and Sequential Patterns Extraction Techniques for Accurate Directional Ground and Infrastructure Stability Measurements" (DGI-SAR), between : "National Institute of RD for Earth Physics" (NIRDEP) and "Terrasigna Ltd" we learned that we can deliver to local authorities, in our case the Municipality of Bucharest and Nuclear Electric Plant at Cernavoda, Romania, important information about the safety of existing buildings through satellite monitoring. These data will be delivered through the service named: "Critical Infrastructure and Seismic Movement Monitoring Service", whose organization will be presented in the paper. Also we shall present other aspects concerning the safety of buildings during their lifetime. On a map of Bucharest, advanced InSAR interferometric techniques help locate certain regional or local anomalies exemplified by ground uplifting or subsidence. On such a map we overlap seismic intensities, periods of oscillation of Bucharest zones during a strong earthquake which could affect the behavior of constructions of the studied zone/region. This showed us possible endangered areas during an earthquake. Persistent Scatterer Interferometry (PSI) technique gave us the possibility to find out about settelemnts of some buildings and sites. This is an important factor for integrity of buildings during their lifetime and especially when they are in seismic regions, because settlement could occur because of soft soil or other reasons in the lifetime of a construction. Moreover, for the first time in the SAR industry, with the launch of the Sentinel-1 Constellation in 2014 continuous spatial and temporal (every 12 days) coverage of the whole Earth is provided and the data is available directly and free of charge. This is a great opportunity to define a robust service based on this mission. First Sentinel-1 InSAR results for Bucharest City will be presented in this paper. The satellite monitoring of areas of interest, metropolitan and industrial, gave us data, which processed, lead to mitigation of seismic risk and discover soil movements, like settlements, during the lifetime of a construction which could endanger its safety. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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