Modelo estructural de densidades de la Caldera del Teide obtenido a partir de observaciones gravimétricas

Comunicación presentada en la “VI Asamblea Nacional de Geodesia y Geofísica”, Madrid, 1988.A partir de los resultados de las campañas gravimétricas efectuadas en la zona de la Caldera del Teide se ha construido un primer modelo estructural de densidades que justifique las anomalías observadas. En este primer ensayo, se ha prescindido de cualquier tipo de hipótesis, tanto geológica como geofísica, al margen de los datos gravimétricos. Se presenta en esta comunicación el proceso de desarrollo del modelo y los resultados de los constrastes de densidades obtenidos.Peer reviewe

Deformaciones de origen térmico del edificio de la Facultad de Ciencias Geológicas de Oviedo detectadas a partir de las observaciones de marea gravimétrica

Comunicación presentada en la “VI Asamblea Nacional de Geodesia y Geofísica”, Madrid, 1988.Durante el periodo comprendido entre marzo y octubre de 1986 estuvo en funcionamiento en un sótano de la Facultad de Ciencias Geólogicas de Oviedo una estación de registro contínuo de la gravedad constituida por un gravímetro LaCoste Romberg mod. G modificado como instrumento de cero y sus elementos complementarios. Los resultados de los análisis de estas observaciones mostraban unas perturbaciones importantes que han sido estudiadas, a partir del análisis de los residuales, teniendo en cuenta la geología local, las características del propio edificio y de su estructura metálica, posibles causas instrumentales y la influencia de parámetros climáticos. Como conclusión se ha encontrado que existe una óptima crorrespondencia entre el espectro de dichos residuales y el de las temperaturas externas. Una vez eliminadas todas las demás causas, esta correspondencia se explica por los efectos que sobre la sensibilidad del sensor han tenido deformaciones, en forma de inclinación del edificio, que se producen por el fuerte gradiente térmico existente entre sus fachadas, principalmente en los meses de verano, y cuyos efectos se acentuan por la estructura metálica externa que para consolidar el edificio, con problemas de estabilidad por posibles causas de asentamiento, se colocó posteriormente a la construcción del mismo.Peer reviewe

Structure of Alluvial Valleys from 3-D Gravity Inversion: The Low Andarax Valley (Almería, Spain) Test Case

This paper presents a gravimetric study (based on 382 gravimetric stations in an area about 32 km2) of a nearly flat basin: the Low Andarax valley. This alluvial basin, close to its river mouth, is located in the extreme south of the province of Almería and coincides with one of the existing depressions in the Betic Cordillera. The paper presents new methodological work to adapt a published inversion approach (GROWTH method) to the case of an alluvial valley (sedimentary stratification, with density increase downward). The adjusted 3D density model reveals several features in the topography of the discontinuity layers between the calcareous basement (2,700 kg/m3) and two sedimentary layers (2,400 and 2,250 kg/m3). We interpret several low density alignments as corresponding to SE faults striking about N140?145°E. Some detected basement elevations (such as the one, previously known by boreholes, in Viator village) are apparently connected with the fault pattern. The outcomes of this work are: (1) new gravimetric data, (2) new methodological options, and (3) the resulting structural conclusions

Structural and oceanic effects in the gravimetric tides observations in Lanzarote (Canary Islands)

Trabajo presentado en el XI International Symposium on Earth Tides, Helsinki, 1989.Since 1987, and as part of the research project that the I.A.G. is carrying out in the Canary Islands, records are obtained of gravimetric and ocean tides, pressure, temperature, etc. on the island of Lanzarote. The structural and geodynamic features of the island make our observations especially interesting because they may help to further research of the possible correlations of responses to tidal forces and other parameters such as crust structure and thickness, geothermic anomalies, etc. In this paper, we present the results obtained until now and a preliminary appraisal is given of these results in view of various previous hypotheses.Peer reviewe

Habitat Constraints in Epikarstic Waters of an Iberian Peninsula Cave System

14 páginas, 6 figuras, 11 tables et al..The epikarstic waters of a restricted sector of the Ojo Guareña cave (north Iberian Peninsula) were investigated to characterize the physico-chemical variation in an annual cycle, to improve the scarce knowledge of the aquatic cave fauna on the Iberian Peninsula, to look for distribution patterns of species per habitat along the annual cycle, and to search for the environmental basis (either physico- or hydro-geochemical) that could explain species distribution in the epikarst. The habitats studied included all puddles and gours present in the sector selected making a total of 51 chemical and 42 biological samples for the entire cycle. The waters show no appreciable contaminationand exhibit small chemical variations throughout the year which are patently affected by external weather conditions. The 53 taxa found belong to ten higher taxonomic groups (Oligochaeta, Turbellaria, Mollusca, Copepoda, Ostracoda, Isopoda, Bathynellacea, Tardigrada, Acarina and Cnidaria), and consist mainly of crustacea with a total of 27 species. Fourteen species were stygobionts (belonging to ten genera), nine of which are new to science and ten of which are endemic. Cave pools that appeared to be more stable in terms of water volume and mineralization, had a lower pCO2 and were carbonate oversaturated, harboured the greatest number of taxa. It is these pools that can maintain strictly cave dwelling species. Pools with lower levels of mineralization and greater water volume fluctuations had a lower diversity of fauna and in general lacked stygobiotic species.Projects PASCALIS EVK2-CT-2001-00121; Convenio Junta de Castilla y León-CSIC (2002-2004) and BTE2002-04492-C02-02.Peer reviewe

Leintz gatzaga landslide: geotechnical analysis and monitorization with terrestial and radar techniques (eoslide project

[ES] La inestabilidad de ladera que afecta a la villa de Leintz Gatzaga (Gipuzkoa) y su entorno ha producido desde hace siglos daños estructurales en viviendas, muros y viales, que van desde moderados a intensos. Esto ha obligado a ejecutar diferentes actuaciones de reparación y consolidación. Se realiza en este trabajo una discusión geológico/geotécnica de los datos disponibles sobre el deslizamiento que afecta a la ladera, así como de los resultados obtenidos a partir de su monitorización con inclinómetros, piezómetros y fisurómetros en los últimos años. Complementariamente, este deslizamiento ha sido elegido como zona test del proyecto EOSLIDE, en el que se han desarrollado e implementado metodologías de vigilancia que combinan técnicas terrestres clásicas con Técnicas Avanzadas de Interferometría Diferencial Radar de Satélite (A-DInSAR), además de utilizar técnicas gravimétricas para la el estudio de estructuras bajo superficie. Se describen las actuaciones realizadas en el marco de este proyecto y los resultados obtenidos.[EN] Leintz Gatzaga village settles on a slope which whose instability has caused the former moderate to severe structural damages for centuries. Different remedial and consolidation solutions have been adopted in order to mitigate the landslide effects. In this work, we analyse and discuss the geological and geotechnical characteristics of the landslide, and the monotorization monitorization results obtained by inclinometers, piezometers and fisurometers in recent years. This landslide has been chosen as a test case to for the EOSLIDE project, which aims is to develop and implement surveillance methodologies combining classic terrestial techniques with Advanced Differential Radar Interferometry (A-DInSAR). Furthermore, gravimetric techniques have been applied in order to study subsoil structures. We describe the procedures and results obtained in within the framework of this project.Este trabajo se ha desarrollado en el marco del proyecto EOSLIDE del MINECO (IPT-2011-1234-310000) de la convocatoria INNPACTO 2011. La investigación de AGC, JFP y JF ha sido también parcialmente sufragada por los proyectos GEOSIR (AYA2010-17448) y AQUARISK (ESP2013-47780-C2-I-R) del MINECO.Peer reviewe

Deslizamiento de leintz gatzaga: instrumentación geotécnica y monitorización del movimiento con técnicas terrestres y espaciales.

La inestabilidad de ladera que afecta a la villa de Leintz Gatzaga (Gipuzkoa) y su entorno ha producido desde hace siglos daños estructurales en viviendas, muros y viales, que van desde moderados a intensos. Esto ha obligado a ejecutar diferentes actuaciones de reparación y consolidación. Se realiza en este trabajo una discusión geológico/geotécnica de los datos disponibles sobre el deslizamiento que afecta a la ladera, así como de los resultados obtenidos a partir de su monitorización con inclinómetros, piezómetros y ?surómetros en lo

Clinical potential of mesenchymal stem cell-derived exosomes in bone regeneration

Bone metabolism is regulated by osteoblasts, osteoclasts, osteocytes, and stem cells. Pathologies such as osteoporosis, osteoarthritis, osteonecrosis, and traumatic fractures require effective treatments that favor bone formation and regeneration. Among these, cell therapy based on mesenchymal stem cells (MSC) has been proposed. MSC are osteoprogenitors, but their regenerative activity depends in part on their paracrine properties. These are mainly mediated by extracellular vesicle (EV) secretion. EV modulates regenerative processes such as inflammation, angiogenesis, cell proliferation, migration, and differentiation. Thus, MSC-EV are currently an important tool for the development of cell-free therapies in regenerative medicine. This review describes the current knowledge of the effects of MSC-EV in the different phases of bone regeneration. MSC-EV has been used by intravenous injection, directly or in combination with different types of biomaterials, in preclinical models of bone diseases. They have shown great clinical potential in regenerative medicine applied to bone. These findings should be confirmed through standardization of protocols, a better understanding of the mechanisms of action, and appropriate clinical trials. All that will allow the translation of such cell-free therapy to human clinic applications

Interaction of 8 He with 208Pb at near-barrier energies: 4 He and 6 He production

Spanish Ministry of Economy and Competitiveness-FPA-2010-22131-CO2-01 (FINURA) y FPA2013-47327-C2-1-RMinistry of Science and Higher Education of Poland-N202 033637National Science Centre of Poland-2013/08/M/ST2/00257 (LEA-COPIGAL) y 2014/14/M/ST2/00738 (COPIN-INFN Collaboration)European Science Foundation-EUI2009-04163432 (EUROGENESIS

Geodetic Study of the 2006–2010 Ground Deformation in La Palma (Canary Islands): Observational Results

La Palma is one of the youngest of the Canary Islands, and historically the most active. The recent activity and unrest in the archipelago, the moderate seismicity observed in 2017 and 2018 and the possibility of catastrophic landslides related to the Cumbre Vieja volcano have made it strongly advisable to ensure a realistic knowledge of the background surface deformation on the island. This will then allow any anomalous deformation related to potential volcanic unrest on the island to be detected by monitoring the surface deformation. We describe here the observation results obtained during the 2006–2010 period using geodetic techniques such as Global Navigation Satellite System (GNSS), Advanced Differential Synthetic Aperture Radar Interferometry (A-DInSAR) and microgravimetry. These results show that, although there are no significant associated variations in gravity, there is a clear surface deformation that is spatially and temporally variable. Our results are discussed from the point of view of the unrest and its implications for the definition of an operational geodetic monitoring system for the islan