Examinando por Autor "Silva, Pablo G."
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Publicación Active landscapes of Iberia(Springer, 2020) Galve Arnedo , Jorge Pedro; Pérez Peña, José Vicente; Azañón, José Miguel; Insua Pereira, Diamantino M.; Cunha, Pedro P.; Pereira, Paulo; Viaplana Muzas, M.; Gracia Prieto, Francisco Javier; Remondo Tejerina, Juan; Jabaloy, Antonio; Bardají Azcárate, Teresa; Silva, Pablo G.; Zazo Cardeña, Caridad; Goy Goy, José Luis; Dabrio, Cristino José; Cabero, Ana; Ortuño Casanova, María del Rocío; Lario Gómez, JavierThe recent geodynamic evolution of Iberia is recorded in its topography. Geomorphic markers and their dating; morphometric indices estimated through cutting-edge DEM analysis techniques; and the link of all this data with results of geophysical studies allow discussing why Iberia displays the highest average elevation in Europe and shows a particular topography with such diversity of landscapes. For example, the region of the Iberian (or Hesperian) Massif, the western sector of Iberia, shows an anomalous average elevation without a satisfactory explanation. On the other hand, different explanations about the recent evolution of the Alpine mountain ranges of the eastern sector of Iberia have come to light after macroscale landscape analyses. This is strengthening the debate on the driving force behind the actual topography of the Pyrenees, Cantabrian Mountains, Iberian Chain and Betics.Publicación Improving the coastal record of tsunamis in the ESI-07 scale: Tsunami Environmental Effects Scale (TEE-16 scale)(Universidad Politécnica de Barcelona, 2016-06) Bardají Azcárate, Teresa; Silva, Pablo G.; Zazo Cardeña, Caridad; Goy Goy, José Luis; Lario Gómez, JavierThis paper discusses possibilities to improve the Environmental Seismic Intensity Scale (ESI-07 scale), a scale based on the effects of earthquakes in the environment. This scale comprises twelve intensity degrees and considers primary and secondary effects, one of them the occurrence of tsunamis. Terminology and physical tsunami parameters corresponding to different intensity levels are often misleading and confusing. The present work proposes: i) a revised and updated catalogue of environmental and geological effects of tsunamis, gathering all the available information on Tsunami Environmental Effects (TEEs) produced by recent earthquake-tsunamis; ii) a specific intensity scale (TEE-16) for the effects of tsunamis in the natural environment at coastal areas. The proposed scale could be used in future tsunami events and, in historic and paleo-tsunami studies. The new TEE- 16 scale incorporates the size specific parameters already considered in the ESI-07 scale, such as wave height, run-up and inland extension of inundation, and a comprehensive and more accurate terminology that covers all the different intensity levels identifiable in the geological record (intensities VI-XII). The TEE-16 scale integrates the description and quantification of the potential sedimentary and erosional features (beach scours, transported boulders and classical tsunamites) derived from different tsunami events at diverse coastal environments (e.g. beaches, estuaries, rocky cliffs,). This new approach represents an innovative advance in relation to the tsunami descriptions provided by the ESI-07 scale, and allows the full application of the proposed scale in paleoseismological studies. The analysis of the revised and updated tsunami environmental damage suggests that local intensities recorded in coastal areas do not correlate well with the TEE-16 intensity (normally higher), but shows a good correlation with the earthquake magnitude (Mw). Tsunamis generated by earthquakes can then be considered efficient processes in the direct transference of the “energy” released by offshore seismogenic sources to the nearest coastal areas, even over distances of hundreds of kilometres (>200km). This scale, as the previous ones, is independent of the earthquake type (i.e. style of faulting) and only focuses on the environmental effects triggered by tsunamis of seismic origin.Publicación Positive correlation between CO2 daily peaks and micro-earthquakes occurrence in deep fault-caves: an empirical model(Istituto Nazionale di Geofisica e Vulcanologia, 2015) Pérez López, Raúl; Bañón, E.; López Gutiérrez, J.; Rodríguez Pascua, Miguel Ángel; Martín Velázquez, S.; Giner Robles, Jorge Luis; Silva, Pablo G.; Moral., B. del; Pueyo Morer, E. L.; Lario Gómez, JavierThe south-eastern part of Spain is determined by different active faults affecting limestone terrains. These terrains have been affected by endokarstic processes. The Benis Cave is the deepest explored cave in the region and it was related to an active fault. Evidence of recent paleoseismic activity and the peculiar topography of the cave, encouraged us to monitor the daily CO2 content in the air composition at depth (-280m), and for a time period of four months. Our results show a preliminary positive correlation between micro-seismic activity in the surroundings (up to 60 km away), and the CO2 concentration (daily increasing of 40ppm for the closest microearthquakes). Moreover, there is an empirical relationship between the daily increment value and the distance to the epicentre. Therefore, we propose an increase in the CO2 concentration into the air karst related to the microseismic activity. Despite this preliminary worthy results, more data are needed to establish an accurate model for earthquake forecasting.