Paraskevi Nomikou

Paraskevi Nomikou
National and Kapodistrian University of Athens | uoa · Faculty of Geology and Geoenviromment

About

256
Publications
89,285
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2,811
Citations
Additional affiliations
August 2002 - present
National and Kapodistrian University of Athens
Position
  • Professor (Associate)

Publications

Publications (256)
Article
Full-text available
The purpose of this particular study is the assessment of landslide susceptibility of Heraklion prefecture area of Crete Island through geospatial analysis in order to present the general susceptibility zonation, so that it may be used as a basis in future extensive and detailed landslide susceptibility research, which will lead to the prevention o...
Article
Full-text available
Volcanic island sector collapses have the potential to trigger devastating tsunamis and volcanic eruptions that threaten coastal communities and infrastructure. Considered one of the most hazardous volcano‐tectonic regions in the world, the Christiana‐Santorini‐Kolumbo Volcanic Field (CSKVF) lies in the South Aegean Sea in an active rift zone. Prev...
Article
Santorini Volcano, located in the central sector of the South Aegean volcanic arc, is one of the most active and potentially dangerous volcanoes in Europe. It has hosted Plinian eruptions over the last 350 ka of which at least four eruptions were accompanied by caldera collapses. Even though Santorini Volcano is considered a major threat, the main...
Conference Paper
Full-text available
Recent studies have shown high-grade Au-ores result from Au remobilization from preexisting mineralization, assisted by fluid-induced, coupled dissolution-reprecipitation (CDR) replacement reaction and scavenging by sulfosalt melts rich in low-melting point chalcophile elements (LMCE). However, these processes are poorly understood in modern, arc-r...
Conference Paper
Full-text available
Zegkinoglou N, Kilias S.P., Zygouri E, Nomikou P, Keith M, Vaněk A, Mihaljevič Vaňková M, Smith D.J., Polymenakou P (2022) Deciphering thallium deportment and remobilization in shallow-water massive sulfides at the Kolumbo arc-volcano, Greece: evidence from in situ LA-ICPMS study and thallium-isotope fractionation. In: Christie AB (ed.) Proceedings...
Conference Paper
Full-text available
Kolumbo is a shallow, submarine arc-volcano, located in the Aegean volcanic arc in Greece. It hosts an active hydrothermal system currently forming polymetallic massive sulfides on the seafloor (SMS) with anomalously high As, Ag, Au, Hg, Sb and Tl contents. It is one of the few known SMS deposit associated with continental margin volcanism. The Kol...
Article
Full-text available
At a time when traditional fieldwork is coming under pressure, be it from shrinking budgets, reducing carbon footprints, increased concerns for personal safety or the desire to make field skills accessible to all, how do we ensure that the key skills of observation, data collection and landscape analysis can still be developed in our students? This...
Conference Paper
The Christiana-Santorini-Kolumbo (CSK) volcanic field lies on the Hellenic Volcanic Arc in the southern Aegean Sea. Its volcanic centers form a NE-SW oriented lineament founded on thinned continental crust in a 100-km-long and 45-km-wide rift zone of en-echelon basins. Having produced devastating events, including the iconic 1600 BCE Minoan Eruptio...
Article
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Immersive virtual reality can potentially open up interesting geological sites to students, academics and others who may not have had the opportunity to visit such sites previously. We study how users perceive the usefulness of an immersive virtual reality approach applied to Earth Sciences teaching and communication. During nine immersive virtual...
Article
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A hydrographic survey of the southwestern coastal margin of Lesvos Island (Greece) was conducted by the Naftilos vessel of the Hellenic Hydrographic Service. The results have been included in a bathymetric map and morphological slope map of the area. Based on the neotectonic and seismotectonic data of the broader area, a morphotectonic map of Lesvo...
Article
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Hydrographic survey of the southeastern coastal margin of Lesvos Island (Greece) was conducted in January 2018 by R/V METEOR. The main morphological characteristic of the southern margin of Lesvos Island is a sub-parallel to the coast elongated basin, 30 km long, 5–10 km wide, and 700 m deep. It is interrupted by an oblique NW–SE narrow channel of...
Article
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The tsunami generation potential of pyroclastic density currents (PDCs) entering the sea is poorly understood, due to limited data and observations. Thus far, tsunami generation by PDCs has been modeled in a similar manner to tsunami generation associated with landslides or debris flows, using two‐layer depth‐averaged approaches. Using the adaptive...
Article
Full-text available
The Christiana-Santorini-Kolumbo volcanic field (CSKVF) in the Aegean Sea is one of the most active volcano-tectonic lineaments in Europe. Santorini has been an iconic site in volcanology and archaeology since the 19th century, and the onshore volcanic products of Santorini are one of the best-studied volcanic sequences worldwide. However, little i...
Conference Paper
Full-text available
The shallow submarine Kolumbo volcano, located in the 5 Ma-to-present Aegean volcanic arc in Greece, hosts an active hydrothermal system currently forming polymetallic seafloor massive sulfide (SMS) mineralization on the seafloor, with high As, Ag, Au, Hg, Sb and Tl contents. It is one of the few known SMS deposits associated with continental margi...
Conference Paper
Full-text available
Target settings to secure sustainable access to raw materials include seafloor massive sulphide (SMS) resources. Gold-rich SMS deposits, are often the result of complex interplay of multiple Au enrichment events. Recent studies have shown that high-grade Au ores result from Au remobilization from preexisting mineralization, driven by fluid-induced...
Article
Full-text available
In extending volcanic arcs such as the Aegean, tectonic processes exert a significant control on magmatism. Spanning scales from 1 to 10s of km, volcanic vents, edifices, and eruptive centers follow the orientation of, and are located near, fault zones. Whether this tectonic control on magmatism results from individual faults/fractures weakening th...
Article
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Almost three-quarters of known volcanic activity on Earth occurs in underwater locations. The presence of active hydrothermal vent fields in such environments is a potential natural hazard for the environment, society, and economy. Despite its importance for risk assessment and risk mitigation, the monitoring of volcanic activity is impeded by the...
Article
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Phytoplankton community was investigated during two contrasting periods using offshore plankton samples in the volcanic area of Methana peninsula (Saronikos Gulf): the first at early autumn (warm period, September 2016) and the second one at early spring (cold period, March 2017). In order to investigate the phytoplankton community structure in the...
Article
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We document and show a state-of-the-art methodology that could allow geoheritage sites (geosites) to become accessible to scientific and non-scientific audiences through immersive and non-immersive virtual reality applications. This is achieved through a dedicated WebGIS platform, particularly handy in communicating geoscience during the COVID-19 e...
Article
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The active Kos-Nisyros-Tilos volcanic field is located in the eastern sector of the Aegean Volcanic Arc resulting from the subduction of the African plate beneath the Aegean plate. The volcanic activity is developed since Middle Pleistocene and it occurs within a tectonic graben with several volcanic outcrops both onshore and offshore. Data obtaine...
Data
Back-arc basins open in response to extensional processes of the overriding plate, which in turn is controlled by the subduction of oceanic lithosphere. These systems are usually controlled at wide-scale by plates convergence, as for the cases of the Mediterranean basins, differently from what happen for the two basins in the Atlantic belonging to...
Book
Full-text available
Back-arc basins open in response to extensional processes of the overriding plate, which in turn is controlled by the subduction of oceanic lithosphere. These systems are usually controlled at wide-scale by plates convergence, as for the cases of the Mediterranean basins, differently from what happen for the two basins in the Atlantic belonging to...
Article
Full-text available
Natural seeps occur at the seafloor as loci of fluid flow where the flux of chemical compounds into the ocean supports unique biologic communities and provides access to proxy samples of deep subsurface processes. Cold seeps accomplish this with minimal heat flux. While individual expertize is applied to locate seeps, such knowledge is nowhere cons...
Article
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Submarine volcanic eruptions have the potential to generate tsunamis, which can cause destruction well beyond the range of the eruption itself. Here, we present a series of underwater eruption experiments in which a non‐condensing gas was injected into a water tank with a range of water depths and applied pressures. This study proposes an effective...
Article
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A submarine volcanic eruption has the potential to generate a dangerous local tsunami. To better understand the free surface disturbance generated by an underwater volcanic eruption, which will form the initial condition for any subsequent wave generation, we conducted a series of laboratory experiments. In these experiments, compressed air was inj...
Article
Submarine hydrothermal activity is responsible for heat and chemical exchanges through the seafloor. Shallow-water hydrothermal systems (SWHS), while identified around the globe, are often studied in a way that is less comprehensive than their deep-ocean counterparts (e.g., along ridges), where systematic optical and acoustic mapping is more preval...
Article
Full-text available
Santorini is located in the central part of the Hellenic Volcanic Arc (South Aegean Sea) and is well known for the Late-Bronze-Age "Minoan" eruption that may have been responsible for the decline of the great Minoan civilization on the island of Crete. To use gravity to probe the internal structure of the volcano and to determine whether there are...
Article
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The volcanic island of Nisyros (Greece) is here presented as it presents unique characteristics being a Quaternary volcano in the eastern Aegean Sea, composed of volcanic rocks, and featuring a central caldera that is surrounded by volcanic domes and thick lavas. Its history is strongly connected to the volcano impressing the visitors with steaming...
Article
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Marine microbial communities are an untapped reservoir of genetic and metabolic diversity and a valuable source for the discovery of new natural products of biotechnological interest. The newly discovered hydrothermal vent field of Santorini volcanic complex located in the Aegean Sea is gaining increasing interest for potential biotechnological exp...
Article
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2021): Applying planetary mapping methods to submarine environments: onshore-offshore geomorphology of Christiana-Santorini-Kolumbo Volcanic Group, Greece, Journal of Maps, ABSTRACT Geologic maps are foundational products for natural hazard assessments but developing them for submarine areas is challenging due to a lack of physical access to the st...
Article
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The project Novel EOSC Services for Emerging Atmosphere, Underwater & Space Challenges (NEANIAS) targets Open Science practices, finally deployed through the European Open Science (EOSC) hub. From a technological perspective, NEANIAS aims to deliver innovative thematic services that are flexible and open to accommodate the needs of communities beyo...
Article
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On 30 October 2020, a strong earthquake of magnitude 7.0 occurred north of Samos Island at the Eastern Aegean Sea, whose earthquake mechanism corresponds to an E-W normal fault dipping to the north. During the aftershock period in December 2020, a hydrographic survey off the northern coastal margin of Samos Island was conducted onboard R/V NAFTILOS...
Conference Paper
Full-text available
The Christiana-Santorini-Kolumbo (CSK) volcanic field in the South Aegean Sea is one of the most active volcanic-tectonic lineaments in Europe, having produced numerous explosive eruptions, catastrophic earthquakes, and disastrous tsunamis in the past 350,000 years. The present-day Santorini caldera is located in the centre of the NE-SW trending CS...
Article
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Dacite lavas erupted from Kameni Islands volcanic centre (Greece) during the last 2000 years have a limited range in chemical composition (SiO2 = 64.0–68.5%) which contrasts with their wide range in plagioclase abundance (3–22%) and crystal size distributions. Most plagioclase crystals have simple zoning and occur independently or in loose clusters...
Article
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Although the rise of antibiotic and multidrug resistant bacteria is one of the biggest current threats to human health, our understanding of the mechanisms involved in antibiotic resistance selection remains scarce. We performed whole genome sequencing of 21 Pseudomonas strains, previously isolated from an active submarine volcano of Greece, the Ko...
Article
The Pico-Faial ridge is a steep WNW-ESE volcanic ridge that has developed within the Nubia-Eurasia diffuse plate boundary, close to the Azores Triple Junction. The ridge comprises two islands, Pico and Faial, separated by a shallow (< 100 m depth) and narrow (< 8 km) channel. Despite some similarities, the two islands show contrasting features stil...
Poster
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Volcanic hazards and risk lie at the heart of global geoscience, with about 800 million people threatened by eruptions. Volcanoes impact humans and the environment through submarine explosions, tephra fallout, pyroclastic flows, earthquakes, tsunamis, and ocean acidification. Some large eruptions, such as the Late Bronze Age eruption of Santorini,...
Technical Report
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On 30 October 2020, an M 7.0 earthquake occurred north of Samos Island. The fault rupture caused sudden lowering of the seafloor, which produced a tsunami that mainly impacted nearby Samos Island as well as a series of Anatolian cities along the coast of Seferihisar Bay, with maximum runup and inundation lengths of about 3.8 m and 2500 m, resulting...
Article
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In the present work we highlight the effectiveness of integrating different techniques and tools for better surveying, mapping and collecting data in volcanic areas. We use an Immersive Virtual Reality (IVR) approach for data collection, integrated with Geographic Information System (GIS) analysis in a well-known volcanological site in Santorini (M...
Article
Full-text available
Reaching the underwater world is undoubtedly an incomparable adventure. Impressive geological structures, flourishing ecosystems, shipwrecks, and submerged landscapes lie beneath the sea surface in wait for discovery. However, this world is accessible only to those who have the chance to dive or to scientists conducting underwater research. By mean...
Chapter
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The Aegean Sea, as part of the Mediterranean, is an ecologically and geologically diverse marine system, with a wide range of habitats including coastal and deep-sea oxic sediments, and submarine volcanoes with seafloor hydrothermal vents and CO2-venting active, and inactive, polymetallic (Au, Ag, Sb, Cu, Pb, Zn) hydrothermal chimneys. Generally, o...
Article
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In this work, we present a methodology for precise 3D modelling and multi-source geospatial data blending for the purposes of Virtual Reality immersive and interactive experiences. We evaluate it on the volcanic island of Santorini due to its formidable geological terrain and the interest it poses for scientific and touristic purposes. The methodol...
Article
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In this contribution, we propose a versatile image-based methodology for 3D reconstructing underwater scenes of high fidelity and integrating them into a virtual reality environment. Typically, underwater images suffer from colour degradation (blueish images) due to the propagation of light through water, which is a more absorbing medium than air,...
Conference Paper
Full-text available
Identification of terrestrial hydrothermal processes, as signals of volcanic unrest or causes of explosive volcanic behaviour, is crucial in volcanic hazard assessment. However, the role of hydrothermal processes in triggering volcanic hazards in the marine environment remain poorly understood, hindering effective assessment. Hydrothermal vents in...