Varvara E Antoniou

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

Submarine hydrothermal systems along active volcanic ridges and arcs are highly dynamic, responding to both oceanographic (e.g., currents, tides) and deep-seated geological forcing (e.g., magma eruption, seismicity, hydrothermalism, and crustal deformation, etc.). In particular, volcanic and hydrothermal activity may also pose profoundly negative s...

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...

Detailed mapping and evaluating of its findings is a critical element of post-disaster period, for assessing the impacts and their spatial distribution, helping recovery by facilitating aid allocation, coordinating relief efforts, monitoring lifelines status, monitoring of clean-up, and assessing secondary effects or induced hazards. Recently, new...

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...

Thorough faunal (benthic foraminifera, ostracods, molluscs) and palynomorph analyses as well as magnetic susceptibility measurements performed on the Piraeus coastal plain sedimentary sequences have shed light on the paleoenvironmental evolution of the area since ca. 9000 cal BP. Benthic and palynomorph assemblages along with magnetic susceptibilit...

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...

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...

Thorough analyses of benthic foraminifera, ostracods, molluscs, pollen and non-pollen palynomorphs as well as magnetic susceptibility measurements in the Piraeus coastal plain deposits shed light on the palaeoenvironmental evolution of the area during the Holocene. The main factors that feature the evolution of the Piraeus coastal landscape have be...

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...

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...

We present a GIS-based crowdsourcing application that was launched soon after the first COVID-19 cases had been recorded in Greece, motivated by the need for fast, location-wise data acquisition regarding COVID-19 disease spread during spring 2020, due to limited testing. A single question was posted through a web App, to which the anonymous partic...

Direct outcrop observation and field data collection are key techniques in research, teaching and outreach activities in volcanic areas. However, very often outcrops are of difficult or impossible access, such as in areas with active volcanoes or steep cliffs. Classical remote-sensing surveys by satellites or airplanes are expensive, rarely reach s...

Climate change is undoubtedly a big issue due to its devastating consequences. The enhanced resilience to natural hazards due to climate change belongs to the concept of smart cities. This Editorial proposes different uses of Geographic Information Systems to handle and disseminate data for natural disasters. Data are gathered from various data sou...

Η λεκάνη απορροής του ρ. Πίκας βρίσκεται στη Δυτική Αττική και αποστραγγίζει τα νότια πρανή των Γερανείων, εκβάλοντας στην πεδινή έκταση που αναπτύσσεται ο οικισμός της Κινέτας. Το ρ. Πίκας διοχετεύεται προς τη θάλασσα σε διεύθυνση (ΝΝΑ) κάθετη ή περίπου κάθετη με την κύρια διεύθυνση στην οποία αναπτύσσονται οι ανθρώπινες υποδομές και ο οικισμός. Η...

This paper is a guide for the NE Attica metamorphic rocks. NE Attica, the area between Pentelikon Mt. and Southern Evoikos Gulf (Fig. 1), represents the northwestern prolongation of Attic-Cycladic Crystalline Complex (ACCC). In the first part of this guide we discuss the geological structure and tectonometamorphic evolution of the NE Attica units....

The contribution of Unmanned Aircraft Systems (UAS, UAV or RPAS) is increasingly acknowledged, researched, tested and applied in a vast variety of fields. Earth Sciences are among the greatest beneficiaries of this development, in terms of having more than an eye in the sky during field work, approaching inaccessible locations and applying Structur...

This work describes the innovative outreach initiative held at the University of Milano-Bicocca (Italy) related to the EGU 2018 Public Engagement Grant awarded for the project titled: “Shaping geological 3D virtual field-surveys for overcoming motor disabilities”. The Public Engagement project aims to create equal opportunities for all students in...

The contribution of Unmanned Aircraft Systems (UAS, UAV or RPAS) is increasingly acknowledged, researched, tested and applied in a vast variety of fields. Earth Sciences are among the greatest beneficiaries of this development, in terms of having more than an eye in the sky during field work, approaching inaccessible locations and applying Structur...

In this study, the research team summarizes the experience obtained during their involvement in natural disaster mapping of recent (2017-2018) significant catastrophic events in Greece. A survey team equipped with cost effective drones was deployed during and/or after disastrous earthquake, mass movement, flash flood and wildfire events. This resul...

On June 12, 2017, an Mw 6.3 earthquake struck Lesvos Island (Northeastern Aegean, Greece). Building damage was observed in its southeastern part with very heavy structural damage limited in the settlement of Vrissa. Taking into account that Vrissa is located further inland from the epicenter than other settlements with less damage, Vrissa looks lik...

Story maps are used as an interactive tool for communication and information dissemination. A web-based application using story mapping technology is presented to explore the Methana peninsula. This volcanic area is characterized by specific volcanic geoforms, unique flora and rich history. The story map combines maps, narrative texts and multimedi...

Lesvos Island is part of an old volcanic center in the east Aegean Sea that was active 15-19 My ago, located west of the coast of NW Asia Minor (Turkey). Geological, seismological and geodesy data indicate that the region’s deformation is driven by transtensional tectonics, including E-W normal and NE-SW strike-slip faulting. The abovementioned com...

On June 12, 2017, a shallow crustal strong earthquake with magnitude 6.3 occurred offshore, south of Lesvos (12:28 GMT), 35.8 km SSW of the capital of Lesvos Island, Mytilene, causing one fatality, extensive earthquake environmental effects and severe structural damage in the SE part of the island. A set of the scientific data acquired in the field...

On June 12, 2017, an Mw 6.3 earthquake struck Lesvos (Northeastern Aegean, Greece). Building damage was observed in its southeastern part with very heavy structural damage limited in the traditional settlement of Vrissa. Taking into account that Vrissa is located inland, further from the epicenter than other settlements with less damage, it looks l...

On June 12, 2017 (12:28 GMT) a strong earthquake struck Lesvos Island (Northeastern Aegean, Greece). Its southeastern part suffered the most in its natural environment, buildings and infrastructures. The data acquired after performing a rapid field macroseismic reconnaissance comprising building-by-building inspection and mapping by using UAS and G...

A major earthquake (Mw=6.3) occurred on the 12th of June 2017 (12:28 GMT) offshore, south of the SE coast of Lesvos Island, at a depth of 13km, in an area characterized by normal faulting with an important strike-slip component in certain cases. Over 900 events of the sequence between 12 and 30 June 2017 were manually analyzed and located, employin...

On June 12, 2017 an Mw 6.3 earthquake struck the southeastern part of Lesvos Island (Northeastern Aegean Sea, Greece). Damage was localized in Vrissa area, in the western part of the affected area. Based on this damage distribution and on the fact that Vrissa is located further inland from the epicenter than other settlements with less damage, an e...

On June 12, 2017 an Mw 6.3 earthquake struck Lesvos Island (Northeastern Aegean, Greece). Its epicenter is located offshore southeastern Lesvos at depth of about 13 km. The main shock was generated by a NW-SE striking and SW-dipping normal fault that constitutes the northern margin of the offshore Lesvos basin. It caused extensive secondary environ...

Vrissa settlement was devastated by the Mw 6.3 earthquake generated offshore southern Lesvos. A rapid damage assessment was implemented during the first post-disaster hours. (a) Building-by-building inspection, upload of points and photos of damaged buildings to ArcGIS online platform, so that all interested agencies have access to critical informa...

On June 12, 2017 an Mw 6.3 earthquake struck the southeastern part of Lesvos Island (Northeastern Aegean Sea, Greece). Damage was localized in Vrissa area, in the western part of the affected area. Based on this damage distribution and on the fact that Vrissa is located inland further from the epicenter than other settlements with less damage, an e...

On June 12, 2017, an Mw 6.3 earthquake struck Lesvos Island (Northeastern Aegean Sea) with epicenter located offshore southeastern Lesvos (Fig. 1) resulting in extensive environmental effects and heavy structural damage in Vrissa settlement (Papadimitriou et al., 2017; Lekkas et al., 2017). Based on the fact that the most affected settlement of Vri...

Preliminary Report on the Mw 6.3 earthquake in Lesvos, Greece (June 12, 2017)

On 12 June 2017 (12:28 GMT) an offshore destructive earthquake occurred approximately 15 km south of the SE coast of Lesvos Island, NE of Chios. There was one fatality in Vrissa village, caused by building collapse and fifteen people were injured due to collapsing buildings and falling debris. Damage was widespread throughout the southeastern part...

A hands-on course on the Management of Disaster Victims was organized and took place in Rhodes (Greece) in the framework of the curricula of two masters degree programs by the School of Medicine and the Department of Geology and Geoenvironment of the National and Kapodistrian University of Athens, in cooperation with the Municipality of Rhodes (Gre...

Santorini volcanic group form the central part of the modern Aegean volcanic arc, developed within the Hellenic arc and trench system, because of the ongoing subduction of the African plate beneath the European margin throughout Cenozoic. It comprises three distinct volcanic structures occurring along a NE-SW direction: Christianna form the southwe...

Kallidromo Mt. consists of alpine formations which in places are unconformably covered by Neogene and Quaternary sediments. The ophiolites are overthrusted on the massive Mesozoic platform carbonate sequence, which forms the basement unit. The base of the tectonic nappe is characterized by a tectonic melange that consists of sandstones, clay stones...

This paper focuses on the study of the Quaternary morphotectonic evolution of the Lefkas Island using morphological and tectonic data. Based on our mainly morphological stud-ies, two principal tectonic structures have been distinguished: (i) the Nydri-Vasiliki Fault Zone (NVF) and (ii) the Ionian Zone overthrust onto the Paxos Zone, which both divi...