Search results for "submarine"

Active north-vergent thrusting in the northern Sicily continental margin in the frame of the quaternary evolution of the Sicilian collisional system

2021

Abstract A three-stage evolution has characterized the Sicilian Fold and Thrust Belt (SFTB) during the last 15 My: two main thin-skinned shortening events involving mainly Meso-Cenozoic carbonate units, followed by thick-skinned thrusting involving Plio-Pleistocene deposits in the frontal area as well as the crystalline basement in the inner and deeper sector of the chain. We investigated the northern Sicily continental margin, by using differently-penetrative seismic reflection data and new field surveys, which revealed, both offshore and onshore, north-vergent compressional structures that affected the tectonic edifice during Quaternary time. These structures, correlated with the kinemati…

Pantelleria island (Strait of Sicily): volcanic history and geomorphological landscape

2017

Pantelleria is a volcanic island located in the Strait of Sicily, 95 km far from the Sicilian coastline and 67 km from Cape Bon (Tunisia). The volcanological history of the island begins approximately 324 ka BP and the last eruptive event was a submarine eruption that occurred on 1891 A.D. Eruptive activity was characterized by seven very intense explosive events, the latest being the Green Tuff (44 ka). They have all produced ignimbrite sheets that covered large sectors of the island. The landscape of the island mirrors the variety of the eruptive styles and their interplay with volcano-tectonics. The most evident geomorphological features are represented by: (i) the mantle-like distributi…

Undersea optical cable network and cyber threats

2019

Almost all services and most of the traditional services are totally dependent on the digital environment. Few users are aware of the revolutionary nature of modern technology. We use day-to-day real-time access to existing digital services in our home country or we use social media (Some) to communicate with friends locally or elsewhere in the world. We can communicate with them in real time with text messages or even through real-time video feed. People have the choice of millions of movies to watch anytime, anywhere. Modern communications connect data centers and data networks of different continents together, enabling real-time communications throughout the world. We can order different…

Human activity and damaging landslides and floods on Madeira Island

2011

Abstract. Over the last few decades, the island of Madeira has become an important offshore tourism and business center, with rapid economic and demographic development that has caused changes to the landscape due to human activity. In Madeira's recent history, there has been an increase over time in the frequency of occurrence of damaging landslide and flood events. As a result, the costs of restoration work due to damage caused by landslide and flood events have become a larger and larger component of Madeira's annual budget. Landslides and floods in Madeira deserve particular attention because they represent the most serious hazard to human life, to property, and to the natural environme…

Enabling Energy Savings in Offshore Mechatronic Systems by using Self-Contained Cylinders

2019

This paper proposes a novel actuation system for an offshore drilling application. It consists of three self-contained electro-hydraulic cylinders that can share and store regenerated energy. The energy saving potential of the proposed solution is analyzed through a multibody system simulation. The self-contained system demonstrates superior energy efficiency compared to the benchmark system representing the state-of-the-art approach used today (i.e., valve-controlled cylinders by means of pressure-compensated directional control valves and counter-balance valves, supplied by a centralized hydraulic power unit). Due to the power on demand capability, the cancellation of the throttling losse…

Okręty podwodne typu Vanguard jako podstawa brytyjskiego systemu odstraszania militarnego w XXI wieku

2016

W świecie pozimnowojennym arsenał atomowy bogatych państw Zachodu przestał odgrywać decydującą rolę w polityce międzynarodowej. Nie znaczy to jednak, iż państwa te całkowicie zrezygnowały z tego narzędzia wywierania wpływu i wyznacznika pozycji siły. Broń atomowa w XXI w. nadal pozostaje najbardziej śmiercionośnym narzędziem pozostającym w arsenale wojskowym. W związku z tym każde państwo dysponujące tego typu uzbrojeniem poszukuje co rusz nowych metod i środków przenoszenia, użycia i modernizacji tejże. W przypadku Wielkiej Brytanii sytuacja jest szczególna, ponieważ flota strategicznych okrętów podwodnych o napędzie atomowym typu Vanguard jest jedynym brytyjskim rodzajem uzbrojenia zdolny…

Submarine Slope Failures Along the Northern Sicilian Continental Margin (Southern Tyrrhenian Sea) and Possible Implications for Geo-Hazard

2013

Mass wasting and downslope movements are common processes that have contributed to shape the northern Sicilian continental margin (southern Tyrrhenian Sea) since the Late Quaternary. Nevertheless, processes controlling their evolution are still partially unknown and a variety of geologic factors can be responsible for their formation. In this work we present an overview of the main mass wasting features (submarine canyons, landslides, debris flows) observed and mapped in different sectors of the northern Sicilian margin. The margin is characterized by a narrow, steep continental shelf (1-2°) and a very irregular and steep (6-8°) upper slope. The main aims of this work are: (1) to outline th…

Submarine canyon of the north-western Sicilian offshore (Southern Tyrrhenian Sea): variability in morphologies, sedimentary processes and tectonic se…

2013

Gas geochemistry of shallow submarine vents in the Aegean sea (Greece)

2017

The Aegean area, which is geodynamically very active, is characterised by intense seismic activity, presence of active volcanic systems and anomalous geothermal gradients. Like other regions of intense geodynamic activity it is also characterized by extensive geogenic degassing. Gas manifestations are not only widespread on land but are also very frequent underwater. Many of these, as for example those of Milos and Santorini, are known since long time and have been previously studied although the targets were generally the hot waters or the sediments affected by the emissions (Smith and Cronan 1978, Dando et al. 1995, Price et al. 2013, Megalovassilis 2014).The present study aims at produci…

Arctic Connect Project and Cyber Security Control, ARCY

2019

The submarine communication cables form a vast network on the seabed and transmit massive amounts of data across oceans. They provide over 95% of international telecommunications — not via satellites as is commonly assumed. The global submarine network is the “backbone” of the Internet, and enables the ubiquitous use of mail, social media, phone and banking services. To these days no any other technology than submarine cables systems has not been such a strategic impact to our society without being known it as such by the people. This also means that it is at the same time a very interesting destination for hackers, cyber attackers, terrorist and state actors. They seek to gain access to in…