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Mt. Thera

Kenneth Zelada

Julian Alter

Mt. Thera’s geological history

  • Thera, in the modern greek Thíra, also called Santoríni.
  • Santorini is an active volcano, although it has been in a dormant state since the end of the last eruption in 1950.
  • The volcano erupted in the Bronze ages.
  • The last eruption was extremely explosive.
  • The magma below the volcano came into contact with the reservoir under the volcano and caused a violent eruption of steam.
  • the eruption was of pliniana type that gave result to 35 km of ash that extended to the atmosphere.

Mt. Thera location

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  • Eruption of Thera may inspired to Hesiod’s Theology about the Titanomachy.
  • The eruption destroyed the Minoan settlement located at Akrotiri, on Santorini.
  • The eruption was the source of the legend of Atlantis and of stories in the Old Testament book of Exodus.

Historical significance

Excavation of Akrotiri on Thera

  • The first destruction happen ranging from 1645 Bc to 1500 Bc.
  • The eruption was as the power of several hundred atomic bombs.
  • Volcanic Explosivity Index (VEI) of 6 or 7.
  • Dense Rock Equivalent (DRE)
  • of 60 km3 (14 cu mi).

Thera’s energy released

  • Hydrogeologist Philip LaMoreaux claimed in 1995 that the Minoan eruption caused climate change.
  • The eruption caused Apocalyptic rainstorms, which devastated much of Egypt.
  • Earthquakes with the eruption, shattered Knossos and damaged other settlements in northern Crete.

Climate effects.

Title

  • The primary hazards associated with the dome-forming eruptions that have occurred during the past 500 years on Santorini include:
  • Phreatic (steam) explosions, ballistic ejecta, ash fallout, gas emissions and rockfalls/slope instability.
  • Fine particles of ash may contaminate water supplies, damage crops and disrupt air traffic.
  • Gas emissions from both lava flows and the eruption plumes may present a health hazard. Sulphur dioxide, steam, hydrogen chloride and other gases released from the eruption vent,
  • when hot lava flows enter the sea, may lead to the formation of an acidic volcanic smog (vog).

Hazard Elements of Thera

Thera’s Silica content, viscosity levels

  • The viscosity levels in thera are high in the magma.
  • The Silica content in the magma is around 75%.
  • Which is pretty high and makes it more explosive.

Video

https://www.youtube.com/watch?v=WRBC-TFtxHw

Topic 6

Question

A. Which Myth is associated with the Thera eruption?

B. Where is located Mt. Thera?

C. What was the VEI of Thera ?

A.The Titanomachy

B. Greece

C. 6 or 7

Answers

sources

Topic 6

  • https://www.livescience.com/4846-eruption-thera-changed-world.html
  • https://www.britannica.com/place/Thera
  • https://en.wikipedia.org/wiki/Minoan_eruption
  • http://santorini.earth.ox.ac.uk/hazards

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