Volumen 10 de la Coleccion Divulgacion. Los libros que forman la coleccion responden a la demanda... more Volumen 10 de la Coleccion Divulgacion. Los libros que forman la coleccion responden a la demanda de informacion de los ciudadanos sobre los temas que mas les afectan: salud, medio ambiente, transformaciones tecnologicas y sociales, etc. Cada volumen, elaborado por un equipo de especialistas en la materia, esta coordinado por un investigador del CSIC.
Mechanisms driving song learning and conformity are still poorly known yet fundamental to underst... more Mechanisms driving song learning and conformity are still poorly known yet fundamental to understand the behavioural ecology of animals. Broadening the taxonomic range of these studies and interpreting song variation under the scope of cultural evolution will increase our knowledge on vocal learning strategies. Here, we analysed changes in fin whale (Balaenoptera physalus) songs recorded over two decades across the Central and Northeast Atlantic Ocean. We found a rapid (over 4 years) replacement of fin whale song types (different inter-note intervals - INIs) that co-existed with hybrid songs during the transition period and showed a clear geographic pattern. We also revealed gradual changes in INIs and note frequencies over more than a decade with all males adopting both rapid and gradual changes. These results provide evidence of vocal learning of rhythm in fin whale songs and conformity in both song rhythm and note frequencies.
On September 2013, the injection of the base gas in a depleted oil reservoir used as an undergrou... more On September 2013, the injection of the base gas in a depleted oil reservoir used as an underground natural gas storage (CASTOR) caused a sudden seismic activity increase in the eastern coast of Spain. As a result, a compact cluster of more than 550 earthquakes with magnitudes mbLg > 0.7 were located in the shallow offshore area of the Gulf of Valencia during two months. The largest event (Mw=4.2) occurred two weeks after the base gas injection activities had finished and was followed by two Mw=4.1 events the day after. The largest earthquakes were felt by the coastal village population, which caused a great media impact and, as a consequence, the gas storage was stopped.
The dataset consists of 14 directories, one for each earthquake analyzed, including raw data and ... more The dataset consists of 14 directories, one for each earthquake analyzed, including raw data and results. A README.txt file describes the contents of the directories.
OSA Optical Sensors and Sensing Congress 2021 (AIS, FTS, HISE, SENSORS, ES), 2021
Distributed acoustic sensing (DAS) using existing underwater optical fiber cables may provide a n... more Distributed acoustic sensing (DAS) using existing underwater optical fiber cables may provide a new way of mapping the deep Earth's interior in these scenarios. It can also lead to a better understanding of infragravity waves.
In this study, we investigate 70 days of distributed acoustic sensing (DAS) recordings in the Can... more In this study, we investigate 70 days of distributed acoustic sensing (DAS) recordings in the Canary Islands using an undersea fiber-optic telecommunication cable that links the islands of Tenerife and Gran Canaria. Two DAS interrogators connected to both ends of the cable turned the fiber into an array of 11,968 strain sensors covering a total length of ∼120 km. We present the details of the experiment, noise analysis, and examples of recorded signals. Seismic ambient noise levels assessment indicates poor local coupling of the cable due to the irregular bathymetry that results in high-amplitude acoustic oscillations in some channels. The DAS array recorded several types of nonseismic (vehicles, surface gravity waves, ships) and seismic signals. Local and regional earthquakes were detected with magnitudes mbLg≥2. Surface waves from teleseismic events at a distance of ∼3000 km were also identified in the strain recordings. Here, we report the first observations with DAS of hydroacou...
Eos, Transactions American Geophysical Union, 2001
The tectonic plate boundary between Eurasia and Africa is complex, in that it cannot be character... more The tectonic plate boundary between Eurasia and Africa is complex, in that it cannot be characterized as a single discrete plate boundary Deformation near this plate boundary varies from trans‐tensional in the Azores archipelago, through strike‐slip in the eastern Atlantic basin, to overall compressional between the European and African continents, with extensional sub‐domains in the Mediterranean Sea. This complex pattern of deformation, related plate motion, and underlying driving forces leads to strong variations in seismic hazard throughout the region. A better understanding of the plate boundary processes requires knowing crust and upper mantle structure in the region, which is best investigated with three‐component, broadband seismic data. To investigate the region's three‐dimensional crust and upper mantle structure, we are carrying out a multiinstitutional project (MIDSEA) involving seismologists from 10 countries on the northern, southern, and western sides of the plate...
... The F distribution test was then used to calculate the confidence for the estimated best mode... more ... The F distribution test was then used to calculate the confidence for the estimated best model parameters (Ugalde et al., 2002). Fig. 3 shows the best fitting energydistance curves along with the observed data for each studied frequency band. ...
Physics of the Earth and Planetary Interiors, 2004
... Fig. 2. Map of southern India showing the location of the seismic stations and earthquakes us... more ... Fig. 2. Map of southern India showing the location of the seismic stations and earthquakes used for the analysis. ... It can be observed that part of the Closepet granite intrusion as well as the eastern and western Dharwar cratons have been crossed by the scattered waves. ...
Volumen 10 de la Coleccion Divulgacion. Los libros que forman la coleccion responden a la demanda... more Volumen 10 de la Coleccion Divulgacion. Los libros que forman la coleccion responden a la demanda de informacion de los ciudadanos sobre los temas que mas les afectan: salud, medio ambiente, transformaciones tecnologicas y sociales, etc. Cada volumen, elaborado por un equipo de especialistas en la materia, esta coordinado por un investigador del CSIC.
Mechanisms driving song learning and conformity are still poorly known yet fundamental to underst... more Mechanisms driving song learning and conformity are still poorly known yet fundamental to understand the behavioural ecology of animals. Broadening the taxonomic range of these studies and interpreting song variation under the scope of cultural evolution will increase our knowledge on vocal learning strategies. Here, we analysed changes in fin whale (Balaenoptera physalus) songs recorded over two decades across the Central and Northeast Atlantic Ocean. We found a rapid (over 4 years) replacement of fin whale song types (different inter-note intervals - INIs) that co-existed with hybrid songs during the transition period and showed a clear geographic pattern. We also revealed gradual changes in INIs and note frequencies over more than a decade with all males adopting both rapid and gradual changes. These results provide evidence of vocal learning of rhythm in fin whale songs and conformity in both song rhythm and note frequencies.
On September 2013, the injection of the base gas in a depleted oil reservoir used as an undergrou... more On September 2013, the injection of the base gas in a depleted oil reservoir used as an underground natural gas storage (CASTOR) caused a sudden seismic activity increase in the eastern coast of Spain. As a result, a compact cluster of more than 550 earthquakes with magnitudes mbLg > 0.7 were located in the shallow offshore area of the Gulf of Valencia during two months. The largest event (Mw=4.2) occurred two weeks after the base gas injection activities had finished and was followed by two Mw=4.1 events the day after. The largest earthquakes were felt by the coastal village population, which caused a great media impact and, as a consequence, the gas storage was stopped.
The dataset consists of 14 directories, one for each earthquake analyzed, including raw data and ... more The dataset consists of 14 directories, one for each earthquake analyzed, including raw data and results. A README.txt file describes the contents of the directories.
OSA Optical Sensors and Sensing Congress 2021 (AIS, FTS, HISE, SENSORS, ES), 2021
Distributed acoustic sensing (DAS) using existing underwater optical fiber cables may provide a n... more Distributed acoustic sensing (DAS) using existing underwater optical fiber cables may provide a new way of mapping the deep Earth's interior in these scenarios. It can also lead to a better understanding of infragravity waves.
In this study, we investigate 70 days of distributed acoustic sensing (DAS) recordings in the Can... more In this study, we investigate 70 days of distributed acoustic sensing (DAS) recordings in the Canary Islands using an undersea fiber-optic telecommunication cable that links the islands of Tenerife and Gran Canaria. Two DAS interrogators connected to both ends of the cable turned the fiber into an array of 11,968 strain sensors covering a total length of ∼120 km. We present the details of the experiment, noise analysis, and examples of recorded signals. Seismic ambient noise levels assessment indicates poor local coupling of the cable due to the irregular bathymetry that results in high-amplitude acoustic oscillations in some channels. The DAS array recorded several types of nonseismic (vehicles, surface gravity waves, ships) and seismic signals. Local and regional earthquakes were detected with magnitudes mbLg≥2. Surface waves from teleseismic events at a distance of ∼3000 km were also identified in the strain recordings. Here, we report the first observations with DAS of hydroacou...
Eos, Transactions American Geophysical Union, 2001
The tectonic plate boundary between Eurasia and Africa is complex, in that it cannot be character... more The tectonic plate boundary between Eurasia and Africa is complex, in that it cannot be characterized as a single discrete plate boundary Deformation near this plate boundary varies from trans‐tensional in the Azores archipelago, through strike‐slip in the eastern Atlantic basin, to overall compressional between the European and African continents, with extensional sub‐domains in the Mediterranean Sea. This complex pattern of deformation, related plate motion, and underlying driving forces leads to strong variations in seismic hazard throughout the region. A better understanding of the plate boundary processes requires knowing crust and upper mantle structure in the region, which is best investigated with three‐component, broadband seismic data. To investigate the region's three‐dimensional crust and upper mantle structure, we are carrying out a multiinstitutional project (MIDSEA) involving seismologists from 10 countries on the northern, southern, and western sides of the plate...
... The F distribution test was then used to calculate the confidence for the estimated best mode... more ... The F distribution test was then used to calculate the confidence for the estimated best model parameters (Ugalde et al., 2002). Fig. 3 shows the best fitting energydistance curves along with the observed data for each studied frequency band. ...
Physics of the Earth and Planetary Interiors, 2004
... Fig. 2. Map of southern India showing the location of the seismic stations and earthquakes us... more ... Fig. 2. Map of southern India showing the location of the seismic stations and earthquakes used for the analysis. ... It can be observed that part of the Closepet granite intrusion as well as the eastern and western Dharwar cratons have been crossed by the scattered waves. ...
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Papers by Arantza Ugalde