• Educational Activities for Students

    The educational program for children at Thissio Visitor Center

  • Doridis Telescope

    Doridis Telescope

  • WMO certificate
  • ttod_photo01
  • August

    August 2017 | Photo: Theofanis Matsopoulos


    Julius Schmidt, CHARTE DES GEBIRGE DES MONDES, 1878, ΝΟΑ Library

  • simonvouet English2

    Simon Vouet (1590 - 1649), The Muses Urania and Calliope (1634)

    National Gallery of Art, USA

  • Τηλεσκόπιο Αρίσταρχος English

    Aristarchos Telescope, Helmos Observatory

  • Helmos National Geographic English

    Helmos Observatory, Photography: Harry Katzjaeger
    Source: "Top Shots," National Geographic, June 2012

  • Eskimo Nebula NGC2392 English

    Eskimo Nebula (NGC2392), Aristarchos Telescope, Observer: Dr. Ioannis Alikakos (NOA)

    Digital Image Processing: Theofanis Matsopoulos.

  • Μουσείο Γεωαστροφυσικής English

    Geoastrophysics Museum, Thissio

  • Εκπαίδευση στο ΕΑΑ English

    Summer School in Astrophysics

  • Τηλεπισκόπηση-Γή English

    Remote Sensing & Earth Observation

  • Greece from ISS English

    Greece from the International Space Station

    Photography: Paolo Nespoli, ESA astronaut

  • 3D Sun English

    3D Image of the Sun from the Solar Dynamics Observatory (SDO) mission of NASA.

    Source: NASA's Solar Dynamics Observatory

  • Helicorder English

    Analogue seismograph recorder

  • Geothermal English
  • Παλιρροιογραφος English

    Tide-gauge of the Instittute of Geodynamics at Vlyhada, Santorini.

  • Πειραμα Ulusses English
    Recovered  Ocean Bottom Seismometers on board of research vessel in the frame of the ULYSSES scientific program
  • Meteo historic archive english

    The historic archive of NOA/IERSD with recordings of climatic observations dated from the mid-19th century is one of the oldesr sources of climatic information for Eastern Medirranean.

  • Meteo time-series graph English

    The evolution of the average annual temperature in Athens from the mid-19th century until today, according to the records of the historic station NOA/IERSD (Hill Nymphs Thission).

  • Researchers Night 2014

    Pnyx Hill: Citizens observe the night sky through telescopes of NOA

    Researchers Night 2014

  • Researchers Night 2014

    Pnyx Hill: Citizens observe the night sky through telescopes of NOA

    Researchers Night 2014

ULYSSE research program

ulusse experiment photo1sULYSSE research program responds to the catastrophe of the unexpected occurrence of the Tohoku subduction giga-earthquake and tsunami in Japan by trying to complete on the SW Hellenic Arc the deep structural investigations missing in Japan, but successfully initiated in Greece (STREAMERS, SEISGREECE, THALES WAS RIGHT). The unexpected giga Japan earthquake and tsunami illustrated that the understanding of seismic hazard in subduction environments is inadequate. Subduction zones are tectonic boundaries where an oceanic plate slides beneath another plate causing the largest earthquakes on Earth (Magnitudes larger than 8). Because these events happen in the coastal domain they often generate destructive tsunami waves.

The subduction zone of the Hellenic Arc is responsible of the highest seismic activity of Europe and Mediterranean area. Its 400 km long south-western segment has been responsible for the largest known earthquake in Europe: the AD 365 ~M 8 earthquake which occurred offshore South of Peloponnesus near SW Crete Island and generated a devastating tsunami that spread into the Nile Delta region. As for all major earthquakes (in Japan the last earthquake larger than M 8 preceding that of Tohoku occurred in 869 AD ) it will occur again. However, we miss reliable and accurate structural information on the location, size and geometry of the seismogenic portion of the subduction mega-thrust fault plane ,that is offshore.

ulusse experiment photo2To achieve our targets and image the deep structure of the subduction mega-thrust fault the Institute of Geodynamics with Dr. Maria Sachpazi performed a seismic marine campaign with reflection and refraction legs between South Peloponnesus and SW of Crete (November 2012) . The methodology uses a source that discharges air under high pressure into the water. The propagated energy is reflected at depth and recorded by the hydrophones deployed along the seismic streamer, a long cable towed behind the vessel. Unfortunately such infrastructure is not available in Greece. The campaign could be realized by using the French academic research vessel POURQUOI PAS of IFREMER thanks to collaboration with the scientific group of the University of Nice-Sofia Antipolis (Dr. Mireille Laigle). Coincident multi-channel reflection and refraction seismics including two 250 km long transects crossing the subduction SW Arc were carried out. For the refraction investigation, 40 sites were occupied by Ocean-Bottom Hydrophones (OBS) provided by GEOMAR (Kiel University).

The Institute of Geodynamics with Dr. Maria Sachpazi has recently surveyed the same area during one year by installing 40 marine seismographs (OBS) provided by Universities of Kiel and of Sofia Antipolis in order to detect the offshore seismicity. First results validate our research efforts by revealing “irregular” seismic patterns and confirm that seismic hazard approach by merely monitoring on land the seismic activity of an offshore seismogenic zone is not enough.

Some of the key questions attempted to be addressed by the joint interpretation of marine profiles and accurate location of offshore seismic events thanks to the OBS monitoring are :Where is the mega-thrust fault in map and depth, and its potentially seismogenic part that could generate a major earthquake, with respect to the coastal region where people are living? What is the maximum possible magnitude of such an event?

Mon Tue Wed Thu Fri Sat Sun

Penteli Visitor Center
Thissio Visitor Center
Educational program on Meteorology
Multiple Events

Real Time Seismicity

Institute of Geodynamics
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Weather Forecast


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The Sky Today


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