1st Congress in Geomatics Engineering

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https://riunet7pre.upv.es/handle/10251/85669

The 1st Congress in Geomatics Engineering aims to bring together scientists, academics and PhD students to exchange and share their results of research and innovation related to any Geomatics discipline. It offers a first-class interdisciplinary platform to present and discuss the innovations, trends, concerns, challenges and solutions adopted in the different fields of Geomatics. This biennial Congress is born within the framework provided by the Interuniversity PhD program in Geomatics Engineering by the Universidad Politécnica de Valencia and the Universidad Politécnica de Madrid.

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Análisis de componentes principales de imágenes multiespectrales en el ámbito del arte rupestre
(Editorial Universitat Politècnica de València, 2017-10-23) Carrión-Ruiz, Berta; Lerma García, José Luis; Dpto. de Ingeniería Cartográfica Geodesia y Fotogrametría; Escuela Técnica Superior de Ingeniería Geodésica, Cartográfica y Topográfica; Ministerio de Economía y Competitividad
[EN] This paper tackles principal component analysis (PCA) in images that include wavelengths between 380-1000 nm. Our approach is focussed on taking advantage of the potencial of ultraviolet and infrarred images, in combination with the visible ones, to improve documentation process and rock art analysis. In this way, we want to improve the discrimination between pigment and support rock, and analyse the spectral behaviour of rock art paintings in the ultraviolet and infrared regions. Three images were used, one image from the ultraviolet (UV) region, one from the visible region (VIS) and another one from the near infrared region (NIR). Optical filters coupled to the camera optics were used to take the images. These filters capture specific wavelengths excluding radiation that we are not interested in registering. Finally, PCA is applied to the acquired images. The results obtained demonstrate the PCA usefulness with imagery in this field and also it is possible to extract some conclusions about the correspondent paint pigments.
ANÁLISIS DE LA COLABORACIÓN CIENTÍFICA EN LA UNIVERSIDAD POLITÉCNICA DE VALENCIA
(Editorial Universitat Politècnica de València, 2017-10-23) Fombuena, Arnau
[EN] The work presented in this paper is focused on employing maps for the visualization of the collaboration network of the Polytechnic University of Valencia (Spain). In this paper, a collaboration is understood as the scientific publications where at least one author is affiliated in the aforementioned university. Furthermore, a visual analysis using the maps created is performed with the goal of observing the proximity of the institutions collaborating with said university, the intensity of said collaborations, and supporting future decision-making processes for new research projects.
Análisis de sismicidad asociada al llenado de embalses. Caso del centro de producción de Pirrís (Costa Rica)
(Editorial Universitat Politècnica de València, 2017-10-23) Ruiz Barajas, Sandra; Alvarado, Guillermo E.; Benito Oterino, Belén; Climent, Álvaro
[EN] The presented work is the result of a new collaboration between the Costa Rican Institute of Electricity (ICE) and the Technical University of Madrid (UPM) for the investigation of induced seismicity issues. Triggered seismicity associated with the filling of artificial water reservoirs is known since six decades ago. However, it is the case of triggered seismicity more complicated to model their effects. More than 100 cases of reservoir induced/triggered seismicity have been collected around the world and this issue continues today being a research topic of great importance. Indeed, new developments and contributions are constantly being made with the aim of achieve a better understanding of their characteristics and genesis. The main aim of the presented work is to analyze the spatial-temporal evolution of the seismic events recorded around the Pirrís reservoir before, during and after its filled. With the analysis of the seismic events we try to know and control the influence of the reservoir operations on the seismic activity of the area. Different parameters are studied, using methodologies proposed by different authors, in order to explain the possible effects of reservoir filling in changing the stress conditions in the environment and to detect any possible anomaly. Moreover, some analysis have been done in order to find a possible correlation between the water level in the reservoir and the evolution of the seismic activity recorded. Overall, the results of this study will provide important conclusions about the sensitivity of certain parameters to evaluate and model the effects of filling reservoirs on the seismic activity in the vicinity and we will present the spatial-temporal evolution of the seismicity associated with the specific case of the Pirrís hydraulic project.
Analysis of repeatability on videogrammetry for infants' cranial deformation
(Editorial Universitat Politècnica de València, 2017-10-23) Barbero García, Inés; Lerma García, José Luis; Marqués Mateu, Ángel; Miranda, Pablo; Dpto. de Ingeniería Cartográfica Geodesia y Fotogrametría; Escuela Técnica Superior de Ingeniería Geodésica, Cartográfica y Topográfica; Centro Valenciano de Estudios sobre el Riego; Universitat Politècnica de València; Instituto de Investigación Sanitaria La Fe
[EN] Cranial deformation affects a large number of infants. The methodologies commonly employed to measure the deformation include, among others, calliper measurements and visual assessment for mild cases and radiological imaging for severe cases, where surgical intervention is considered. Visual assessment and calliper measurements usually lack the required level of accuracy to evaluate the deformation. Radiological imaging, including Computed Tomography (CT) and Magnetic Resonance Imaging (MRI), are costly and highly invasive. The use of smartphones to record videos that can be used for three-dimensional (3D) modelling of the head has emerged as a low-cost, noninvasive methodology to extract 3D information of the patient. To be able to analyse the deformation, a novel technique is employed: the obtained model is compared with an ideal head. In this study we have tested the repeatability of the process. For this purpose, several models of two patients have been obtained and the differences between them are evaluated. The results show that the differences in the ellipsoid semiaxis for the same patient are usually below 4 mm, although they increase up to 6.4 mm in some cases. The variability in the distances to the ideal head, which are the values used to evaluate deformity, reaches a maximum value of 2.7 mm. The errors obtained are comparable to those of classical measurement techniques and show the potential of the methodology in development.
Aplicación de índices de forma en la determinación de polígonos slivers derivados de las dimensiones lineales de una figura y su área
(Editorial Universitat Politècnica de València, 2017-10-23) Sánchez Marco, Miguel; Gallego Salguero, Áurea; Dpto. de Ingeniería Cartográfica Geodesia y Fotogrametría; Escuela Técnica Superior de Ingeniería Agronómica y del Medio Natural
[EN] Nowadays cartography is more and more required by users, companies and government agencies. A lot of tasks need digital, updated and quality cartography: Civil work design, planning, landscaping, environmental impact, conservation, etc. This need of cartography is mostly solved by spatial data infrastructures and map servers that make downloading and getting maps easy. Later, using Geographical Information Systems (GIS) it is quite easy to perform queries and geoprocessing operations in order to get valuable information which is difficult to get with other tools. However slivers polygons are a serious problem. They can alter the results in spatial analysis, queries and map portray. A map with sliver polygons is a map with false polygons and therefore with errors. We need to remove them. Removing sliver polygons is simple once they have been located. The real problem is to manage to locate them. Some sliver polygons are small, others are large but in both cases sliver polygons are difficult to locate and tell them apart from other polygons. Scientists have used formulas to calculate the shape of objects for many years. Today there are dozens of formulas available that could be used in the characterization and location of polygons slivers. In this article many of these shape formulas are analyzed and conclusions are drawn on whether they can be used in locating sliver polygons.
Aplicaciones de los índices de fragmentación de los usos del suelo para caracterizar la expansión urbana
(Editorial Universitat Politècnica de València, 2017-10-23) Sapena, Marta; Ruiz Fernández, Luis Ángel; Dpto. de Ingeniería Cartográfica Geodesia y Fotogrametría; Escuela Técnica Superior de Ingeniería Geodésica, Cartográfica y Topográfica; Grupo de Cartografía Geoambiental y Teledetección; Ministerio de Economía y Competitividad
[EN] The growing number of people living in urban areas implies the need for more sustainable landscape management. The analysis and monitorization of urban areas allows for the quantification and characterization of urban sprawl processes. Currently, new geospatial and statistical databases are being developed in Europe (Urban Atlas and Urban Audit) with up-to-date and homogeneous information on urban areas, easing its comparison and monitorization, as well as the development of tools for computing urban fragmentation metrics by means of these data, such as IndiFrag. In this work, three applications of fragmentation metrics in multiple scales are presented. Firstly, an intra-urban analysis has been conducted by municipalities in Rome in two dates. Secondly, a massive analysis, comparing at the inter-urban level the fragmentation degree for one date and their growth patterns in a sample of 68 European urban areas. Finally, multiple regression models were tested to explore the prediction of socio-economic variables using the fragmentation metrics of the 68 urban areas. The outcomes show that fragmentation metrics for the analysis of morphology, composition, and urban growth, allow for quantifying urban sprawl patterns at intra- and inter-urban levels, facilitating its relation with socioeconomic variables.
Determinación de trayectorias de bloques rocosos en ensayos mediante videogrametría
(Editorial Universitat Politècnica de València, 2017-10-23) Prades, Albert; Matas, Gerard; Núñez-Andrés, Amparo; Buill, Felipe; Lantada, Nieves; Corominas, Jord; Ministerio de Economía y Competitividad
[EN] Determining the trajectory of a block that falls down on a slope is not straightforward due to the high number of variables involved. Because of this, the appropriate understanding of how these variables may affect the trajectories is required. In this work, we estimate some magnitudes that affect the trajectories of the blocks such as the coefficient of restitution and the energy thresholds for fragmentation of the blocks among others. We have chosen the controlled scenario of a quarry in which targets and high speed video cameras were arranged to capture images of the blocks falling from the top of a slope. The position of the blocks over time has been measured from video frames applying photogrammetric methods. From here, the velocities and the accelerations have been determined, and with the estimated mass of each block, we have calculated the energy balance.
Diferentes paisajes y análogas represenaciones. Interpretación arqueológica con tecnologías de ingeniería inversaq
(Editorial Universitat Politècnica de València, 2017-10-23) Otero, Xosefina; Farjas, Mercedes; Santos, Manuel; Angás, Jorge; Ministerio de Economía y Competitividad
[EN] In this paper we present new methods of the documentation and registration of the petroglyphs of the exceptional archaeological site located on Khor Fakkan, emirate of Sharjah, on the east coast of the United Arab Emirates along the Gulf of Oman, and coordinates 24º59'06.06'' N - 56º20'36.70'' E. The engravings on the surface of the serpentine rock fragments, of the Semail ophiolite complex that was generated when the Saudí plate was introduced under the IranZagros, in the Cretaceous, are made with the technique and striped characteristic of the Bronze Age and Iron Age. We conducted the study respecting its conservation without any intervention on them, using the latest available technologies and performing aerial, terrestrial and near object digital photogrammetry and applying at the same time the methodology of Landscape Archaeology.
Difusión del Arte rupestre a través de aplicaciones móviles de realidad aumentada: un enfoque práctico
(Editorial Universitat Politècnica de València, 2017-10-23) Blanco Pons, Silvia; Lerma García, José Luis; Dpto. de Ingeniería Cartográfica Geodesia y Fotogrametría; Escuela Técnica Superior de Ingeniería Geodésica, Cartográfica y Topográfica; Ministerio de Economía y Competitividad
[EN] Rock art of the Mediterranean Basin of the Iberian Peninsula was declared World Heritage Site by UNESCO, it has an outstanding cultural value hence its dissemination is essential. Over the years, rock art paintings have been deteriorated and even some have disappeared. Consequently, it is quite difficult to recognise them in situ without experts. At this point, non-invasive and novel techniques can offer great potential, on the one hand, avoiding direct contact with the surface promoting its conservation, and on the other hand, through dissemination and analysis of these elements. One of the most promising techniques is Augmented Reality (AR). By means of AR applications, the visitor can see any kind of virtual content related to cultural heritage, through its mobile or tablet screen. Thus, any virtual content that is considered of interest can be added, offering in this way additional information that complements the real element. In this study, two approaches are presented for the rock art dissemination of the Cova dels Cavalls. The first is based on a marker recognition, which launches the application that displays an image of the motif and a descriptive text about it. In the second proposal, the camera device recognises the real image of the painting and the virtual information is overlapped. The study aims at evaluating the use of these AR techniques applied to rock art dissemination and shows the methodology for its development
Diseño de estrategias de crowdsourcing en sistemas de información geográfica voluntaria
(Editorial Universitat Politècnica de València, 2017-10-23) Gómez Barrón Sierra, José Pablo; Manso-Callejo, Miguel-Ángel; Alcarria, Ramón
[EN] This work addresses voluntary geographic information (VGI) as an information system that facilitates organizations to achieve specific goals by outsourcing processes and activities to an online community. A definition of a voluntary geographic information system (VGIS) is proposed, identifying its core components (Project, Participants, Technology), then, crowdsourcing, the most relevant process for managing information within these type of systems, is analysed. We analyse several types of crowdsourcing models in the context of VGIS, and it is proposed a classification built around the different ways of organizing a community, which include different levels of participation according to the use of three processes: contributory, collaborative and participatory. Based on the study of the different typologies intrinsically linked to the existing levels of involvement and engagement, and the use of participants' cognitive skills, a continuum of participation is identified, presenting two opposite tendencies when designing VGI projects: crowd-based and community-driven, the latter with higher levels of collaboration or even co-creation. Based on the above, it is proposed a set of criteria for the design of the crowdsourcing strategy of a VGIS, as a roadmap that directs the project. This design and planning tool helps to characterize and define in a simple way the general requirements of the processes and activities of a VGIS that will be implemented through a crowdsourcing task, being the first step in the interdependent design of the project, participation and technological components. The design of subsequent strategies related to the other components of the system must be aligned and linked to the crowdsourcing strategy, and altogether will guide the development of tasks, functionalities and the specific technological tools of the system.
Dispersión urbana y sostenibilidad ambiental en la Comunitat Valenciana
(Editorial Universitat Politècnica de València, 2017-10-23) Miñana-Fayos, Salvador; Gielen, Eric Madeleine Pierre; Riutort-Mayol, Gabriel; Dpto. de Urbanismo; Escuela Técnica Superior de Ingeniería de Caminos, Canales y Puertos
[EN] The territory is configured by different urban models. During the last decades the tendency in many European countries has been forward to an urban sprawl development model. This kind of development causes several economic, social and environmental effects. This paper is focused on studying the environmental effects of the urban sprawl model for all municipalities of Valencia. These effects are measured over a set of 14 environmental indicators. First of all, an urban sprawl index is calculated by means of the Principal Component Analysis technique from the three more characteristic variables of the sprawl phenomenon. Finally, a regression model with spatially correlated effects is formulated with the aim of estimating the effects of the urban sprawl model on the environmental indicators. It is concluded that the sprawl model causes significant effects on most of the environmental indicators.
Documentación 3D de la cova dels cavalls y de su entorno (Tírig, Castellón)
(Editorial Universitat Politècnica de València, 2017-10-23) Cabrelles, Miriam; Lerma García, José Luis; Dpto. de Ingeniería Cartográfica Geodesia y Fotogrametría; Escuela Técnica Superior de Ingeniería Geodésica, Cartográfica y Topográfica; Ministerio de Economía y Competitividad
[EN] Archaeological cultural heritage is a precious resource that should be transmitted to future generations. The 3D digital representation of monuments and sites has proven to be a reliable method for this aim. This article shows the geomatics workflow undertaken for the complex rock art documentation of the Cova dels Cavalls (Tírig, Castellón). The paintings are part of the Rock art of the Mediterranean Basin of the Iberian Peninsula declared a UNESCO’s World Heritage Site in 1998. The various stages are reviewed, from the acquisition phase up to the delivery of part of the derived metric products, such as 3D models and photorealistic models.
EPOS (European Plate Observation System)
(Editorial Universitat Politècnica de València, 2017-10-23) Fernández, José; Gallart, Josep; Carbonell, Ramón; Díaz, Jordi; Villaseñor, Antonio; Azor, Antonio; Gonzalez-Matesanz, Francisco; Geyer, Adelina; Curto, Juan; Mattesini, Maurizio; Rodríguez-Fernández, Roberto; Fernández-Turiel, José; Ministerio de Economía y Competitividad
[EN] EPOS (European Plate Observation System) (https://www.epos-ip.org/) is now established as the only European multidisciplinary and global research infrastructure in Earth Sciences. It integrates several hundred national observatories for the observation and measurement of the internal and dynamic structure of the planet, and in particular in Europe, distributed in 25 European countries, including Spain. The EPOS project, included in the 2008 ESFRI Roadmap, has been recognized by ESFRI in 2016 as a priority project for its implementation, because of its strategic relevance in the European Research Area.
Estimación del riesgo sísmico en Castilla-La Mancha para la elaboración del plan especial de emergencias
(Editorial Universitat Politècnica de València, 2017-10-23) Romero Jarén, Rocío; Quirós, Ligia; Sorondo, Fernando; Benito, Belén
[EN] An estimation of the seismic risk in Castilla - La Mancha (Spain) is set forth in the current work, in order to develop the special emergency programme. To carry out the study it has been necessary to define a multidisciplinary group of experts in each involved discipline: geology and tectonics, seismology, architecture, engineering and geographical information systems. The main aim is to develop different seismic risk maps to provide the basis to elaborate the emergency plans in Castilla - La Mancha. These plans must follow the stipulated guidelines in the seismic risk field. A probabilistic methodology is adopted to define the seismic risk, considering this as the human and material losses in presence of the expected seismic event. The seismic hazard of the area of study is evaluated through return periods of 475 and 975 years, equivalents to exceedance probabilities of 10% and 5% in 50 years respectively. These probabilities are proposed in the framework of the Spanish seismic code “Normativa Sismorresistente Española, NCSE-02”, for conventional and special buildings. In a first approach, the study attempt to estimates the expected losses in each city of the overall of Castilla - La Mancha in the presence of the probable movements in 50 and 100 years. The results allow us to make a relative estimation of the seismic risk in different areas, identify those cities which undergo highest damages indexes and which ones would require a more in-depth assessment so as to mitigate the risk. Besides, the results contribute to establish objective priorities to define emergency plans at city scale.
Influencia del espectro sísmico en los efectos de los terremotos en las edificaciones
(Editorial Universitat Politècnica de València, 2017-10-23) Navas Sánchez, Laura; Cervera Bravo, Jaime; Benito Oterino, Belén; Ministerio de Economía y Competitividad
[EN] This project aims to analyse the influence that the response spectrum form may have in the damage that a building structure suffers. In order to demonstrate, two different buildings have been modelled: the first represents a typical construction situated in Lorca, which has a long fundamental period. And another which has a short fundamental period, whose singular design allows us to extract some conclusions about the influence of certain factors such as irregularities or torsion effects. Besides, it will be applied in both buildings two different seisms: a short and a long-period response spectrum, so as to study the resonance phenomenon. In addition, it will be exposed briefly the most important changes that have suffered the seismic codes according to the seismic design of building structures.
Matlab-based tool for drainage network ordering by Horton and Hack hierarchies
(Editorial Universitat Politècnica de València, 2017-10-23) Pastor-Martín, Candela; Antón, Loreto; Fernández-González, Carlos; Ministerio de Economía y Competitividad; Universidad Nacional de Educación a Distancia; Comunidad de Madrid
[EN] This work presents a new MATLAB-based tool designed for network extraction and drainage network orderings by Horton and Hack hierarchies. Most GIS software offers only topological network orderings, based on joining segments, such as Stahler or Shreve, providing segments between junctions but not entire streams. Differently, Hack and Horton orderings allow organizing a drainage network in a hierarchy, identifying the parent segment over the child segment, giving as a result a drainage network where the value of a river remains unchanged from the mouth upstream to the headwater, allowing extracting entire streams. Horton and Hack hierarchies ease the interpretation of a drainage system compared to Strahler and Shreve. To extract the drainage network, this tool uses TopoToolbox 2 functions, to compute the prior steps of the channel network extraction and channel network ordering processes, and develops new functions. To sort a network, this tool allows selecting the parameter that defines the network hierarchy. This parameter is the socalled hierarchy attribute and could be the distance upstream, which refers to the distance between a junction upstream to the headwater, or the upstream accumulation, which is the accumulation at the junction. In addition to these mandatory parameters, the tool offers a set of optional parameters which turns it into a competitive alternative to generate a highly tailored ordered drainage network. The continuous channel network provided by the tool facilitates the use of other multiple applications for landscape analysis, such as the extraction longitudinal profiles or basin analysis through geomorphic indices.
Procesamiento automatizado de modelos tridimensionales de úlceras cutáneas
(Editorial Universitat Politècnica de València, 2017-10-23) Sánchez-Jiménez, David; Buchón Moragues, Fernando Francisco; Palomar Vázquez, Jesús Manuel; Peris Fajarnes, Guillermo; Dpto. de Ingeniería Gráfica; Dpto. de Ingeniería Cartográfica Geodesia y Fotogrametría; Escuela Técnica Superior de Ingeniería Geodésica, Cartográfica y Topográfica; Centro de Investigación en Tecnologías Gráficas; Grupo de Cartografía Geoambiental y Teledetección; Centro de Investigación de Tecnología de la Edificación
[EN] Geomatics includes techniques such as photogrammetry, remote sensing and geographic information systems, which provide applicable tools in various areas of biomedicine, for example skin ulcer measurement. In previous projects we developed procedures for acquiring data and measuring skin ulcers using a digital photo camera, a manual scanner and photogrammetry software based on correlation. We have tested our technique in a randomized clinical trial in patients with chronic leg ulcers. In the present project an application system is created with the following objectives: automate the processing of three-dimensional models of cutaneous ulcers and generate documentation that ease the interpretation of the evolution of skin ulcers by medical personnel (including PDF report, AVI animation and XOS augmented reality project). We also created a website prototype that stores the documentation, allowing registered users to upload photographs and consult or modify the database of skin ulcers. A test is performed with 50 cutaneous leg ulcers, in order to debug and improve the application system and the website prototype
La representación gráfica georreferenciada alternativa en la coordinación catastro-registro en España. Estudio de la implantación de la norma ISO-19152 (LADM) a nivel internacional
(Editorial Universitat Politècnica de València, 2017-10-23) Velilla-Torres, Joan Manuel; Mora Navarro, Joaquín Gaspar; Femenia Ribera, Carmen; Martínez Llario, José Carlos; Instituto Universitario de Tecnologías de la Información y Comunicaciones; Dpto. de Ingeniería Cartográfica Geodesia y Fotogrametría; Escuela Técnica Superior de Ingeniería Geodésica, Cartográfica y Topográfica; Grupo de Cartografía, Geodesia y GPS
[EN] In Spain, the new Law 13/2015, dated June 24, modifying the Mortgage Law and the Cadastre Law in the search for its coordination, introduce the obligation to obtain georeferenced mapping and update the Cadastre in many cases. It is necessary to provide the graphic representation of the farms in case of: segregation, division, grouping and aggregation, and in the case of the operations of parceling, reparcelling, land consolidation, segregation, division, grouping or aggregation, forced expropriation or demarcation which determine a reordering of the land. It also requires the geographical delimitation of the area occupied by buildings declared within a farm. In all of these cases, if there is no coincidence of the farm in the field with the descriptive cadastral certification and the graphic of the farm, an alternative georeferenced graphical representation, duly accredited, is necessary, and where the adventurers are quoted to express or not their Conformity. This thesis aims to investigate an international level with the possibility of collaborating in the current developments, especially applying the ISO 19152 (On the Land Administration Domain Model) to the Spanish case and national level, applying the new Reforms of the Mortgage Law and the Cadastre Law. Performing georeferenced graphical maps, in the cases in which the law forces it. To develop GIS software for the automation of information creation, as well as, the new formats creation used to Spanish Cadastre updating. The software will be tested in the real cases that will be performed.
Software development for colourimetric and spectral data processing: pycolourimetry
(Editorial Universitat Politècnica de València, 2017-10-23) Molada Tebar, Adolfo; Lerma García, José Luis; Marqués Mateu, Ángel; Dpto. de Ingeniería Cartográfica Geodesia y Fotogrametría; Escuela Técnica Superior de Ingeniería Geodésica, Cartográfica y Topográfica; Centro Valenciano de Estudios sobre el Riego; Ministerio de Economía y Competitividad
[EN] Archaeological documentation is a complex process where the technical measurement and specification of colour is a key aspect. In the last years heritage documentation processes have largely benefited from the application of digital recording methods, imagery analysis software and technologies that offers great advantages over the traditional methods. The rigorous processing of colourimetric data requires software packages with specific colourimetric technical characteristics. In this paper we report on our in-house pyColourimetry software that was developed and tested taking into account the recommendations of the Commission Internationale de l'Éclairage (CIE). The objective is to apply a rigorous procedure for the characterisation of cameras based a priori on polynomial models. Most of the digital cameras capture colour information in the well-known RGB format, but the signals generated by the digital camera are device dependent. By means of the characterisation we establish the relationship between device dependent RGB values and the tristimulus coordinates defined by the CIE standard colourimetric observer. Once the camera is characterised, users have the potential to obtain output images in the sRGB space that is independent of the sensor of the camera. pyColourimetry software allows users to control the entire digital image processing and the colourimetric data workflow proposed. We applied the methodology on a set of pictures targeting Levantine rock art motifs in Cova dels Cavalls (Castellón, Spain) which is considered part of a UNESCO World Heritage Site. The outcomes obtained are satisfactory and very promising for proper colour documentation in cultural heritage estudies.
Stress transfere and statistical analysis of 2012 Ahar-Varzeghan siesmic sequence, Northwestern Iran
(Editorial Universitat Politècnica de València, 2017-10-23) Yazdi, Pouye; Gaspar Escribano, Jorge; Santoyo, Miguel Angel
[EN] In 11 of August 2012, two destructive earthquakes with Mw= 6.4 and 6.2 occurred between cities Ahar and Varzeghan (Northwest Iran). They had a close epicentral distance of 6 Km and also had a short time lag of 11 minutes. Following that, a high-rate of aftershock activity began where during the first month more than 2000 events (M≥0.7) affected several villages in the area. The seismic released energy induced significant damage and losses in an extensive zone. Right after the seismic doublet occurrence, a surface rupture with a primarily east-west orientation was observed. The idea of having an almost vertically dipped fault plane for the first shock is more consistent with the trace of the upper edge on the surface and the focal mechanism solutions which propose a steady dipping EW. Previous studies propose different geometries for the generating faults of the second earthquake. In this study, we associate the surface rupture with the first mainshock and both nodal plane explaining the relationship between the two main seismic events are discussed after Coulomb failure stress calculation due to the first shock. Then the stress transfer because of the doublet is analyzed in order to determine its consistency with the statistical modeling prediction for the aftershock population and spatial distribution. For statistical modeling a temporal version of Epidemic Type Aftershock Sequence (ETAS) is applied on one-year seismicity including events with minimum magnitude of 2.5.

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