scholarly journals On the Need for a Tsunami Warning System in the North East Atlantic Area (Gulf of Cadiz)

10.5772/14068 ◽  
2011 ◽  
Author(s):  
Baptista M. ◽  
Omira R. ◽  
Matias L. ◽  
Miranda J. ◽  
Annunziato A. ◽  
...  
Keyword(s):  
Warning System ◽  
Tsunami Warning ◽  
Gulf Of Cadiz ◽  
East Atlantic ◽  
Tsunami Warning System ◽  
North East ◽  
The North ◽  
Gulf Of Cádiz ◽  
Atlantic Area

scholarly journals Thrust–wrench interference tectonics in the Gulf of Cadiz (Africa–Iberia plate boundary in the North-East Atlantic): Insights from analog models

2011 ◽  
Vol 289 (1-4) ◽  
pp. 135-149 ◽  
Author(s):  
João C. Duarte ◽  
Filipe M. Rosas ◽  
Pedro Terrinha ◽  
Marc-André Gutscher ◽  
Jacques Malavieille ◽  
...  
Keyword(s):  
Plate Boundary ◽  
Gulf Of Cadiz ◽  
East Atlantic ◽  
North East ◽  
The North ◽  
Gulf Of Cádiz ◽  
Analog Models

scholarly journals Potential deployment of offshore bottom pressure gauges and adoption of data assimilation for tsunami warning system in the western Mediterranean Sea

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Mohammad Heidarzadeh ◽  
Yuchen Wang ◽  
Kenji Satake ◽  
Iyan E. Mulia
Keyword(s):  
Data Assimilation ◽  
Warning System ◽  
Western Mediterranean ◽  
Tsunami Warning ◽  
Sensitivity Analyses ◽  
Bottom Pressure ◽  
Tsunami Warning System ◽  
Earthquake Scenarios ◽  
The North ◽  
Western Mediterranean Basin

AbstractWestern Mediterranean Basin (WMB) is among tsunamigenic zones with numerous historical records of tsunami damage and deaths. Most recently, a moderate tsunami on 21 May 2003 offshore Algeria, North Africa, was a fresh call for strengthening tsunami warning capabilities in this enclosed water basin. Here, we propose to deploy offshore bottom pressure gauges (OBPGs) and to adopt the framework of a tsunami data assimilation (TDA) approach for providing timely tsunami forecasts. We demonstrate the potential enhancement of the tsunami warning system through the case study of the 2003 Algeria tsunami. Four scenarios of OBPG arrangements involving 10, 5, 3 and 2 gauges are considered. The offshore gauges are located at distances of 120–300 km from the North African coast. The warning lead times are 20, 30, 48 and 55 min for four points of interest considered in this study: Ibiza, Palma, Sant Antoni and Barcelona, respectively. The forecast accuracies are in the range of 69–85% for the four OBPG scenarios revealing acceptable accuracies for tsunami warnings. We conclude that installation of OBPGs in the WMB can be helpful for providing successful and timely tsunami forecasts. We note that the OBPG scenarios proposed in this study are applicable only for the case of the 2003 Algeria tsunami. Further studies including sensitivity analyses (e.g., number of OBPG stations; earthquake magnitude, strike, epicenter) are required in order to determine OBPG arrangements that could be useful for various earthquake scenarios in the WMB.

Artificial reefs in the North –East Atlantic area: Present situation, knowledge gaps and future perspectives

2021 ◽  
Vol 213 ◽  
pp. 105854
Author(s):  
Bianca Reis ◽  
Pieter van der Linden ◽  
Isabel Sousa Pinto ◽  
Emanuel Almada ◽  
Maria Teresa Borges ◽  
...  
Keyword(s):  
Present Situation ◽  
Artificial Reefs ◽  
Future Perspectives ◽  
East Atlantic ◽  
Knowledge Gaps ◽  
North East ◽  
The North ◽  
Atlantic Area

scholarly journals Effect of climatic oscillations on small pelagic fisheries and its economic profit in the Gulf of Cadiz

2021 ◽  
Author(s):  
Jairo Castro-Gutiérrez ◽  
Remedios Cabrera-Castro ◽  
Ivone Alejandra Czerwinski ◽  
José Carlos Báez
Keyword(s):  
Linear Models ◽  
Supply And Demand ◽  
The Arctic ◽  
Gulf Of Cadiz ◽  
East Atlantic ◽  
European Anchovy ◽  
Climatic Oscillations ◽  
North East ◽  
Gulf Of Cádiz ◽  
First Sale

AbstractSeveral studies have shown the effect of climatic oscillations on fisheries. Small pelagic fish are of special global economic importance and very sensitive to fluctuations in the physical environment in which they live. The main goal of this study was to explore the relationship between the North Atlantic Oscillation (NAO), the East Atlantic pattern (EA), and the Arctic Oscillation (AO) on the landings and first sale prices of the most representative small pelagic commercial species of the purse-seine fisheries in the Gulf of Cadiz (North East Atlantic), the European anchovy Engraulis encrasicolus and the European sardine Sardine pilchardus. Generalised linear models (GLMs) with different data transformations and distribution errors were generated to analyse these relationships. The best results of the models were obtained by applying a moving average of order 3 to the dataset with a double weighted median. Our results demonstrate relationships between NAO, AO, and EA and European anchovy and sardine landings. These cause an indirect effect on the first sale price in markets through catch variations, which affect the price according to the law of supply and demand. The limitations of this study and management implications are discussed.

scholarly journals Tsunamigenic earthquakes in the Gulf of Cadiz: fault model and recurrence

2013 ◽  
Vol 13 (1) ◽  
pp. 1-13 ◽  
Author(s):  
L. M. Matias ◽  
T. Cunha ◽  
A. Annunziato ◽  
M. A. Baptista ◽  
F. Carrilho
Keyword(s):  
Convergence Rates ◽  
Thin Sheet ◽  
Plate Boundary ◽  
Warning System ◽  
Fault Model ◽  
Generation Model ◽  
Gulf Of Cadiz ◽  
Tsunami Warning System ◽  
Seismicity Rates ◽  
Gulf Of Cádiz

Abstract. The Gulf of Cadiz, as part of the Azores-Gibraltar plate boundary, is recognized as a potential source of big earthquakes and tsunamis that may affect the bordering countries, as occurred on 1 November 1755. Preparing for the future, Portugal is establishing a national tsunami warning system in which the threat caused by any large-magnitude earthquake in the area is estimated from a comprehensive database of scenarios. In this paper we summarize the knowledge about the active tectonics in the Gulf of Cadiz and integrate the available seismological information in order to propose the generation model of destructive tsunamis to be applied in tsunami warnings. The fault model derived is then used to estimate the recurrence of large earthquakes using the fault slip rates obtained by Cunha et al. (2012) from thin-sheet neotectonic modelling. Finally we evaluate the consistency of seismicity rates derived from historical and instrumental catalogues with the convergence rates between Eurasia and Nubia given by plate kinematic models.

Nautical Chart Standardization

1983 ◽  
Vol 36 (3) ◽  
pp. 468-479
Author(s):  
D. W. Newson
Keyword(s):  
Large Scale ◽  
East Atlantic ◽  
Nautical Chart ◽  
North East ◽  
The North ◽  
History Of ◽  
The North Sea ◽  
Successful Establishment ◽  
Atlantic Area ◽  
Two Bodies

This paper deals with the work of the International Hydrographic Organisation (IHO) during the last ten years towards the standardization of nautical charts. The work began with the devising of a regional scheme of medium- and large-scale sheets of the north-east Atlantic area, to be co-produced by member nations as contributions to an International (INT) set of charts. It subsequently became clear that, as well as the scheme, a detailed set of specifications would be necessary to secure uniformity of choice of symbols and abbreviations throughout the International series, and also in the various national chart series of which it would form a part.The history of nautical chart standardization has recently been traced by Ritchie – gradual at first after the beginning of the International Hydrographic Bureau in 1921, and later speeding up when the International Hydrographic Conference of 1967 established a study which led to two series of INT charts on very small scales. After this the process gathered further speed with the successful establishment of the two bodies with whose work this paper is primarily concerned: the North Sea International Chart Commission (NSICC) in 1972 and the Chart Specifications (later Standardization) Committee (CSC) in 1977. The ten-nation NSICC, in drawing up the network of INT sheet-lines for its area, established the principles on which such schemes would be extended worldwide and also did extensive groundwork for the Chart Specifications of the IHO. These were completed for worldwide application by the seventeen-nation CSC.

scholarly journals Artificial Reefs in the North-East Atlantic Area: Present Situation, Knowledge Gaps and Future Perspectives

2021 ◽  
Author(s):  
Bianca Reis ◽  
Pieter van der Linden ◽  
Isabel Sousa Pinto ◽  
Emanuel Almada ◽  
Maria Teresa Borges ◽  
...  
Keyword(s):  
Research Evaluation ◽  
Anthropogenic Impacts ◽  
Artificial Reefs ◽  
Fish Stock ◽  
Future Perspectives ◽  
East Atlantic ◽  
Financial Investment ◽  
North East ◽  
The North ◽  
Atlantic Area

Artificial reefs have been deployed in multiple regions of the world for different purposes including habitat restoration and protection, biodiversity and fish stock enhancement, fisheries management and recreation. Artificial reefs can be a valuable tool for ecosystem protection and rehabilitation, helping mitigate the effects of anthropogenic impacts that we face today. However, knowledge on artificial reefs is unevenly distributed worldwide, with some regions having much more quality information available and published (e.g. European Mediterranean Sea area), while others, for instance the North-East Atlantic area, do not. Here, we provide a characterization of purposely built artificial reefs in North-East Atlantic area based on all available literature (i.e. research papers and reports), highlighting the needs and gaps that are vital for establishing future perspectives for artificial reef deployment and research. In the North-East Atlantic area, sixty-one purposely built artificial reefs have been deployed since 1970, mostly between the years 1990-2009, with Spain being the country with the highest number of artificial reefs. The most reported purpose for their deployment is fisheries productivity and habitat/species protection, although, most artificial reefs are multipurpose in order to maximise the benefits of a given financial investment. The majority of artificial reefs were submerged at < 50 m, mainly between 10-20 m of depth. The most used designs were cubic blocks and complex designs made by an array of combined shapes, which mostly consist of concrete (79%). From all the analysed data on artificial reefs, 67% of the cases reported surveys to assess biodiversity after the deployment. However, in 26% of those cases, data was not available. When data was available, only 31% of cases reported long-term biomonitoring surveys (3 years or more). Based upon these findings, we noticed a general lack of scientifically robust data, including records of species and abundance of both fish and invertebrates, as well as macroalgae. Preventing an adequate determination of the best balance between shape, construction material and bio-colonization. Critiques and suggestions are discussed in the light of current available data in order to perform more efficient research, evaluation and functioning of future artificial reefs.

scholarly journals THE HELLENIC NATIONAL TSUNAMI WARNING CENTER: RESEARCH, OPERATIONAL AND TRAINING ACTIVITIES

2017 ◽  
Vol 50 (2) ◽  
pp. 1100 ◽  
Author(s):  
G.A. Papadopoulos ◽  
G.A. Tselentis ◽  
M. Charalampakis ◽  
All the scientific staff of the Institut All the scientific staff of the Institute of Geodynamics1
Keyword(s):  
Tide Gauge ◽  
Eastern Mediterranean ◽  
Warning System ◽  
Tsunami Warning ◽  
Tsunami Warning System ◽  
Warning Messages ◽  
The North ◽  
Operational Life ◽  
High Level ◽  
And Training

The Hellenic National Tsunami Warning Center (HL-NTWC), which is a unit of the Institute of Geodynamics of the National Observatory of Athens (NOA-IG), was officially established in Greece by law in September 2010. It operates a 24/7 tsunami monitoring service for Greece and the eastern Mediterranean Sea, providing warning messages to the General Secretariat for Civil Protection in Greece. Since August 2012, HL-NTWC acts as Candidate Tsunami Service Provider (CTSP) in the framework of the North-Eastern Atlantic, the Mediterranean and connected seas Tsunami Warning System (NEAMTWS) of the IOC/UNESCO providing tsunami messages to a large number of subscribers. The HL-NTWC function is based on the national seismograph and tide gauge networks of NOA-IG and incorporates several data bases, algorithms and computational tools. Collaboration with top class research institutions in the framework of important EC funded tsunami research projects strengthens the scientific background of the center. Tests, exercises and training of the duty officers involved in the 24/7 operation of the HL-NTWC are carried on constantly, in order to maintain a high level of readiness and response in case of emergency. In its operational life since August 2012 the HL-NTWC has timely issued tsunami warning messages for 14 potentially tsunamigenic earthquake events.

scholarly journals Apseudomorph tanaidaceans (Crustacea: Peracarida) from mud-volcanoes in the Gulf of Cadiz (North-east Atlantic)

Zootaxa ◽  
2011 ◽  
Vol 2919 (1) ◽  
pp. 1 ◽  
Author(s):  
MAGDALENA BŁAŻEWICZ-PASZKOWYCZ ◽  
ROGER N. BAMBER ◽  
MARINA R. CUNHA
Keyword(s):  
Deep Sea ◽  
Morphological Features ◽  
The Other ◽  
Mud Volcanoes ◽  
Gulf Of Cadiz ◽  
East Atlantic ◽  
North East ◽  
Gulf Of Cádiz ◽  
Associated Species ◽  
High Diversity

Faunal collections from mud-volcano sites in the Gulf of Cadiz, at depths between 355 and 3061 m, have revealed a high diversity (and in some cases high density) of tanaidaceans. A previous paper has described some of the tanaidomorph species found. Records of apseudomorph species from deep-sea chemosynthetic habitats are almost non-existent. The present study reports on seven apseudomorph species from five different genera from this material; two of the species, one in each of the genera Sphyrapus and Pseudosphyrapus are new to science, although there was insufficient material available to describe fully the Pseudosphyrapus species. Two of the other species are reported herein for only the second time. A neotype is erected for Apseudes setiferus Băcescu, and a lectotype for Sphyrapus malleolus Norman & Stebbing; these two, plus Atlantapseudes nigrifrons Băcescu and Fageapseudes retusifrons Richardson are redescribed. The habitus of Apseudes grossimanus is figured. None of the taxa appear to show any morphological features specifically adapted to the peculiar habitat around mud-volcanoes. The genus Collossella is relegated to the synonymy of Fageapseudes. The nonchemosynthetic-habitat-associated species Apseudes coriolis is moved to Taraxapseudes.

New tanaidomorph Tanaidacea (Crustacea: Peracarida) from submarine mud-volcanoes in the Gulf of Cadiz (North-east Atlantic)

Zootaxa ◽  
2011 ◽  
Vol 2769 (1) ◽  
pp. 1 ◽  
Author(s):  
MAGDALENA BŁAŻEWICZ-PASZKOWYCZ ◽  
ROGER N BAMBER ◽  
MARINA R CUNHA
Keyword(s):  
Hydrothermal Vents ◽  
Cold Seep ◽  
Cold Seeps ◽  
Mud Volcanoes ◽  
Gulf Of Cadiz ◽  
East Atlantic ◽  
Present Material ◽  
North East ◽  
Gulf Of Cádiz ◽  
High Diversity

Faunal collections from mud-volcano sites in the Gulf of Cadiz, at depths between 355 and 3061 m, have revealed a high diversity (and in some cases high density) of tanaidaceans. The present study reports on nine new tanaidomorph species from eight different genera from this material. These include representatives of genera known elsewhere from non-ventassociated deep-sea habitats, but notably only the second and third (respectively) representatives of two genera, Coalecerotanais and Cristatotanais, known previously from cold-seep-habitats in the Gulf of Mexico. The genus Spinitanaopsis is synonymized with Cristatotanais. The tanaidacean records to date from hydrothermal vents or cold seeps are collated as a context for the present material. The possibilities of habitat-endemism in tanaidacean taxa associated with reducing environments and their biogeography are discussed.

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