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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 36.404°N
  • 25.396°E

  • 367 m
    1204 ft

  • 212040
  • Latitude
  • Longitude

  • Summit

  • Volcano

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Basic Data

Volcano Number

Last Known Eruption



1950 CE

367 m / 1204 ft


Volcano Types

Lava dome(s)

Rock Types

Andesite / Basaltic Andesite
Basalt / Picro-Basalt
Trachyte / Trachyandesite

Tectonic Setting

Subduction zone
Continental crust (> 25 km)


Within 5 km
Within 10 km
Within 30 km
Within 100 km

Geological Summary

Renowned Santorini (Thera), with its steep-walled caldera rim draped by whitewashed villages overlooking an active volcanic island in the center of a caldera bay, is one of the scenic highlights of the Aegean. The circular island group is composed of overlapping shield volcanoes cut by at least four partially overlapping calderas. The oldest southern caldera was formed about 180,000 years before present (BP), followed by the Skaros caldera about 70,000 years BP, and then the Cape Riva caldera about 21,000 years BP. The youngest caldera formed about 3600 years BP during the Late-Bronze-Age Minoan eruption that forced abandonment of the thriving Aegean Sea island. Post-Minoan eruptions beginning in 197 BCE constructed a series of lava domes and flows that form two islands near the center of the caldera. A submarine eruption took place in 1650 AD outside the caldera NE of Thera. The latest eruption at Santorini produced a small lava dome and flow in 1950, accompanied by explosive activity.


The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography.

Barton M, Huijsmans J P P, 1986. Post-caldera dacites from the Santorini volcanic complex, Aegean Sea, Greece: an example of the eruption of lavas of near-constant composition over a 2,200 year period. Contr Mineral Petr, 94: 472-495.

Druitt T H, Edwards L, Mellors R M, Pyle D M, Sparks R S J, Lanphere M, Davies M, Barreirio B, 1999. Santorini volcano. Geol Soc London Mem, 19: 1-165 and 1:20,000 geol map.

Druitt T H, Francaviglia V, 1992. Caldera formation on Santorini and the physiography of the islands in the late Bronze age. Bull Volc, 54: 484-493.

Druitt T H, Mellors R A, Pyle D M, Sparks R S J, 1989. Explosive volcanism on Santorini, Greece. Geol Mag, 126: 95-126.

Fouque F, 1879. Santorini et ses Eruptions. Masson G (ed), Libraire l'Academie de Medicine, Paris, 440 p (English translation by A R McBirney published by Johns Hopkins Univ Press, 1998).

Friedrich W L, 2000. Fire in the Sea, The Santorini Volcano: Natural History and the Legend of Atlantis. London: Cambridge Univ Press, 258 p.

Friedrich W L, Kromer B, Friedrich M, Heinemeier J, Pfeiffer T, Talamo S, 2006. Santorini eruption radiocarbon dated to 1627-1600 B.C.. Science, 312: 548.

Fytikas M, Kolios N, Vougioukalakis G, 1990. Post-Minoan volcanic activity of the Santorini volcano: volcanic hazard and risk, forecasting possibilities. In: Hardy D (ed) {Thera and the Aegean World III}, London: Thera Foundation, 2: 183-198.

Georgalas G C, 1962. Greece. Catalog of Active Volcanoes of the World and Solfatara Fields, Rome: IAVCEI, 12: 1-40.

Gertisser R, Preece K, Keller J, 2009. The plinian Lower Pumice 2 eruption, Santorini, Greece: magma evolution and volatile behavior. J Volc Geotherm Res, 186: 387-406.

Hardy D (ed), 1990. Thera and the Aegean World III. London: Thera Foundation.

Heiken G, McCoy F, 1984. Caldera development during the Minoan eruption, Thira, Cyclades Greece. J Geophys Res, 89: 8441-8462.

Higgins M D, 1996. Magma dynamics beneath Kameni volcano, Thera, Greece, as revealed by crystal size and shape measurements. J Volc Geotherm Res, 70: 37-48.

Kaloyeropoyloy A (ed), 1971. Acta of the 1st International Science Congress on the Volcano of Thera, held in Greece, 15th-23rd September, 1969. Athens: Arch Serv Greece, 436 p.

Manning S W, Ramsey C B, Kutschera W, Higham T, Kromer B, Steier P, Wild E M, 2006. Chronology for the Aegean Late Bronze Age 1700-1400 B.C.. Science, 312: 565-569.

McCoy F W, Heiken G, 2000. The late-Bronze age explosive eruption of Thera (Santorini), Greece: regional and local effects. In: McCoy F W, Heiken G (eds), {Volcanic Hazards and Disasters in Human Antiquity}, Geol Soc Amer Spec Pap, 345: 43-70.

Sigurdsson H, Carey S, Alexandri M, Vougioukalaki G, Croff K, Roman C, Sakellariou D, Angagnostsu C, Rousakis G, Ioakim C, Gogou A, Ballas D, Misaridis T, Nomikou P, 2006. Marine investigations of Greece's Santorini volcanic field. Eos, Trans Amer Geophys Union, 87: 337, 342.

Taddeucci J, Wohletz K H, 2001. Temporal evolution of the Minoan eruption (Santorini, Greece), as recorded by its Plinian fall deposit and interlayered ash flow beds. J Volc Geotherm Res, 109: 299-317.

Vespa M, Keller J, Gertisser R, 2006. Interplinian explosive activity of Santorini volcano (Greece) during the past 150,000 years. J Volc Geotherm Res, 153: 262-286.

Vougioukalakis G, 1996. Santorini, Guide to "The Volcano". Institute for the Study and Monitoring of the Santorini Volcano, 82 p.

Eruptive History

Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
1950 Jan 10 1950 Feb 2 Confirmed 2 Historical Observations Nea Kameni (Liatsikas dome)
1939 Aug 20 1941 Jul 2 ± 1 days Confirmed 2 Historical Observations Nea Kameni (Triton, Ktenas, Fouque domes)
1928 Jan 23 1928 Mar 17 Confirmed 2 Historical Observations Nea Kameni (Naftilos dome)
1925 Aug 11 1926 May Confirmed 2 Historical Observations Nea Kameni (Dafni dome)
1866 Jan 26 1870 Oct 15 Confirmed 2 Historical Observations Georgios, Afroessa and Reka domes
1707 May 23 1711 Sep 14 Confirmed 3 Historical Observations Nea Kameni
1650 Sep 27 1650 Dec 6 Confirmed 4 Historical Observations Colombo Bank (6.5 km NE of Thera)
1570 1573 Confirmed 3 Historical Observations Mikri Kameni
0726 Jul 15 ± 45 days Unknown Confirmed 4 Historical Observations NE side of Thia Island
0046 Dec 31 0047 Feb 1 ± 30 days Confirmed 3 Historical Observations Thia Island
[ 0019 ] [ Unknown ] Discredited    
0197 BCE Unknown Confirmed 3 Historical Observations Hiera Island
1610 BCE ± 14 years Unknown Confirmed 7 Radiocarbon (corrected)

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.


Thera | Thira


Feature Name Feature Type Elevation Latitude Longitude
Aspronisi Tuff ring
Cape Balos Pyroclastic cone
Cape Columbos Tuff ring
Cape Kokkinopetra Pyroclastic cone
Cape Mavrorachidi Pyroclastic cone
Kokkino Vouno Pyroclastic cone 292 m
Megalo Vouno Pyroclastic cone 329 m
Peristerria Shield volcano 300 m
Skaros Shield volcano 300 m


Feature Name Feature Type Elevation Latitude Longitude
Bm-caldera Pleistocene caldera
Bu-caldera Pleistocene caldera
Colombo Bank
    Columbo Bank
Minoan caldera Caldera
Pleistocene caldera


Feature Name Feature Type Elevation Latitude Longitude
Dafni Dome
Fouque Dome
Georgios Dome
Kamenae Dome
Ktenas Dome
Liatsikas Dome
Naftilos Dome
Niki Dome
Reck Dome
Smith Dome
Triton Dome


Feature Name Feature Type Elevation Latitude Longitude
Nea Kameni Island - Composite
Palea Kameni Island - Composite
Thera Island - Caldera rim fragment
Island - Caldera rim fragment 295 m

Photo Gallery

The gentle outer flanks of the Santorini caldera, mantled by deposits of the 3500-year-old Minoan eruption, provide a setting for croplands and island villages. This view, looking NW from Mt. Profitis Ilias, a limestone peak forming the high point of the island of Thera, shows the northern half of the 7.5 x 11 km caldera. Its northern rim drops below sea level, leaving a channel between the tip of Thera and the island of Therasia at the left.

Photo by Lee Siebert, 1994 (Smithsonian Institution).
The steep inner walls of Santorini, capped by whitewashed villages, drop steeply into the caldera bay, forming one of the scenic highlights of the Aegean. Pyroclastic-flow deposits from four caldera-forming eruptions dating back to 100,000 years ago are exposed in the caldera walls in this north-looking view. The youngest caldera was formed about 3500 years ago during the noted Minoan eruption of Santorini. The flat-topped peak on the left skyline is Skaros, a remnant of a shield volcano constructed within a previous caldera.

Photo by Lee Siebert, 1994 (Smithsonian Institution).
The steep eastern caldera walls of Santorini are draped by the whitewashed houses of the town of Firá, many of which were excavated within deposits of the late Bronze Age Minoan eruption that took place about 3500 years ago. The most prominent unit in the caldera wall at this location is the Middle Tuff Sequence, the lighter-colored, cliff-forming unit halfway up the wall that is composed of a basal pumice-fall deposit overlain by lag-breccia and pyroclastic-flow deposits. The Middle Tuff and the darker bedded layers overlying it were deposited during late-Pleistocene eruptions of Santorini.

Photo by Lee Siebert, 1994 (Smithsonian Institution).
This spectacular outcrop shows light-colored deposits from the 3500-year-old Minoan eruption of Santorini volcano filling a valley cut in darker, bedded ashfall layers of Pleistocene age. The lower, beige-colored unit filling the ancient valley is a pumice-fall deposit from vertical explosions early in the eruption. It is overlain by laminated pyroclastic-surge deposits produced when water gained access to the magma reservoir as the volcano collapsed into the sea. The upper whitish layer truncating both these deposits is a pyroclastic-flow deposit.

Photo by Lee Siebert, 1994 (Smithsonian Institution).
The course of the late Bronze Age Minoan eruption of Santorini is charted by this roughly 10-m-thick exposure of deposits produced by the 3500-year-old eruption. The loosely compacted basal pinkish layer (excavated here by a circular storage tunnel) is formed of early airfall pumice deposited from powerful vertical eruption columns. It is overlain by lighter-colored, laminated deposits of pyroclastic surges produced when water gained access to the eruption column as caldera collapse began. The thicker, upper unit consists of pyroclastic-flow deposits.

Photo by Lee Siebert, 1994 (Smithsonian Institution).
During Medieval times the Skaros promontory, formed of lavas of the Skaros shield volcano, was a densely populated catholic fortress bristling with buildings. The fortress was constructed because it offered protection from pirates, but following a series of strong earthquakes accompanying the 1707-1711 and other eruptions, it was progressively abandoned, and few building remnants remain. Therasia Island lies across the caldera at the upper right, and the tip of Nea Kameni Island in the center of the caldera appears at the left.

Photo by Lee Siebert, 1994 (Smithsonian Institution).
Wave erosion has exposed a cross section through bedded scoria layers of the Cape Mavrorachidi cinder cone on the SW side of Thera Island. Behind the cone to the left are exposures of light-colored rhyodacitic tuffs of the Early Centres of the Akrotiri Peninsula. A Potassium-Argon date of 522,00 +/- 104,000 yrs Before Present (BP) and a more accurate 451,000 +/- 27,000 BP Argon-Argon date were obtained from a lava flow from the Cape Mavrorachidi cone. The cinder cone is one of several cinder and spatter cones formed on the Akrotiri Peninsula.

Photo by Lee Siebert, 1994 (Smithsonian Institution).
The headland of Cape Thera rises above Phira harbor. The massive light-brown, cliff-forming unit above the harbor is the Cape Thera Ignimbrite. Above the cliffs is a sequence of sloping minor pyroclastics and paleosols, which underlies the prominent thinner dark-colored layer at the top of the photo. This is the Middle Pumice unit, a welded plinian pumice-fall deposit erupted about 100,000 years ago and thought to originate from a vent west of Phira. The lower-angle slopes above it are lithic breccias of the Middle Pumice eruption.

Photo by Lee Siebert, 1994 (Smithsonian Institution).
The blocky dacitic lava flow at the right is part of the Dafni lavas, erupted early in the course of an eruption that lasted from 1925 to 1926. The east wall of Santorini caldera, capped by the town of Firá, rises across the caldera bay. The 1925-1926 eruption, like many other of Santorini's post-caldera eruptions, began with submarine explosions and lava effusion. Explosive activity was unusually strong during this eruption, producing eruption columns up to 3.2 km high.

Photo by Lee Siebert, 1994 (Smithsonian Institution).
The dark-colored lava flow at the right center of the photo and the crater in the foreground were formed during an eruption from 1939 to 1941. The 1939-41 lava flows traveled to the east and west, reaching almost to the sea on the east side and extending into the caldera bay at several location on the west side on Nea Kameni island. A chain of N-S-trending craters was formed during the eruption. The crater seen in this photo cut lava flows of an earlier 1866-1870 eruption. The town of Firá caps the rim of Santorini caldera along the horizon.

Photo by Lee Siebert, 1994 (Smithsonian Institution).
Palaea Kameni (Thia) Island in the center of the photo was formed by the extrusion of lava flows during a 46-47 AD eruption. This was the second documented eruption producing a new island in the caldera bay. The black lava flows in the foreground on Nea Kameni island were emplaced during an 1866-1870 eruption. The small island in the right distance to the SW, capped by light-colored rocks of the 3600-year-old Minoan eruption, is part of the caldera wall, which extends beneath the sea surface to the Akrotíri Peninsula on the extreme left.

Photo by Lee Siebert, 1994 (Smithsonian Institution).
An aerial view from the east overlooks the outer flanks of Santorini's 7.5 x 11 km caldera. The far caldera rim, part of which is flooded by the sea, appears at the upper left and right. The towns of Firá and Merovígli cap the caldera rim, and farms drape the outer flanks of the volcano, which are underlain by deposits from the cataclysmic Minoan-age eruption about 3500 years ago. The post-caldera islands of Nea and Palaea Kameni (upper-center) were constructed in the middle of the caldera during eruptions dating back to 197 BC.

Photo by Lee Siebert, 1994 (Smithsonian Institution)
The crater in the foreground was formed during an eruption from 1570-1573 AD. The eruption was the first in more than 800 years from Santorini. Initially submarine eruptions were followed by the formation of the new island of Mikri Kameni (Little Burnt Island) NE of Palaea Kameni Island. The 1570-73 eruption created a small dome-shaped island with a diameter of about 400 m and a height of 70 m, topped by a 20-m-deep crater. The western wall of Santorini's caldera appears in the background, capped by the houses of the village of Merovígli.

Photo by Lee Siebert, 1994 (Smithsonian Institution)
The black lava flows that descend into Santorini's caldera bay are the Dafni lavas, erupted during 1925-26. During this eruption, which began in August 1925 and lasted until January 1926, Nea Kameni became a single island as the Dafni lavas united Mikra Kameni, Nea Kameni and Georgios domes. Eruptions resumed in May 1926, when small pyroclastic flows occurred. The steep-sided eastern caldera wall rises in the distance, capped by the town of Fira and the smooth-textured pyroclastic-flow deposits of the Minoan eruption.

Photo by Lee Siebert, 1994 (Smithsonian Institution)
The lava flow forming the peninsula (center) dates back to an eruption during 1707-1711. Nea Kameni Island was formed between Palaea and Mikri Kameni islands during alternating explosive and effusive activity that began with uplift of a small islet of pumice called Aspronisi (White Island). Following the eruption the new island became dotted with small churches and buildings used by residents of Santorini who came to swim in the thermal springs. The caldera-rim islands of Thirasia (left) and Thira (right) can be seen in the distance to the NW.

Photo by Lee Siebert, 1994 (Smithsonian Institution)
Palaea Kameni Island (right-center) rises from Santorini's caldera bay SE of the foreground cliffs of Thirasia Island. The higher, flat-topped part of the island was formed during 46-47 AD, and the gentler slopes in front of it date back to 726 AD. The highly explosive eruption of the summer of 726 AD produced great quantities of pumice and ash that were transported as far as the islands of Abydos and Lesbos, Asia Minor, and Macedonia. Extrusion of the Ayios Nikolaos lavas followed, which eventually joined the NE tip of Thia (Palaea Kameni) Island.

Photo by Lee Siebert, 1994 (Smithsonian Institution)
The dramatic mostly submerged caldera of Santorini volcano is seen from space in this satellite image from NASA. The 11 x 7.5 km caldera was formed during at least four major explosive eruptions, the last of which occurred during the Bronze Age about 1650 BC. The arcuate islands of Thira (right) and Therasia (left) form the outer flanks of the caldera. The darker area near the center of the caldera is Nea Kameni Island, which along with Palea Kameni Island to its left, is part of a post-caldera cone formed during historical eruptions dating back to 197 BC.

ASTER satellite image, 2000 (NASA,

Smithsonian Sample Collections Database

The following 31 samples associated with this volcano can be found in the Smithsonian's NMNH Department of Mineral Sciences collections. Catalog number links will open a window with more information.

Catalog Number Sample Description
NMNH 111123-862 Augite andesite
NMNH 111123-863 Augite andesite
NMNH 111123-864 Augite andesite
NMNH 111123-865 Augite andesite
NMNH 111123-866 Glaucophane schist
NMNH 112461 Basalt
NMNH 112462 Basalt
NMNH 116000 Dacite pumice
NMNH 116710-1 Pumice
NMNH 116710-2 Pyroclastic-rock
NMNH 116710-3 Pyroclastic-rock
NMNH 62893-1 Lava
NMNH 98686 Andesite
NMNH 98687 Pyroxene andesite
NMNH 98688 Pyroxene andesite
NMNH 98689 Pyroxene andesite
NMNH 98690 Pyroxene andesite
NMNH 98691 Pyroxene andesite
NMNH 98693 Lava
NMNH 98694 Lava
NMNH 98695 Lava
NMNH 98696 Lava
NMNH 98697 Lava
NMNH 98698 Lava
NMNH 98699 Lava
NMNH 98700 Lava
NMNH 98702 Lava
NMNH 98703 Lava
NMNH 98704 Lava
NMNH 98705 Lava
NMNH 98706 Schist

Affiliated Sites

Large Eruptions of Santorini Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).
WOVOdat WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.
EarthChem EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS).
MODVOLC - HIGP MODIS Thermal Alert System Using infrared satellite Moderate Resolution Imaging Spectroradiometer (MODIS) data, scientists at the Hawai'i Institute of Geophysics and Planetology, University of Hawai'i, developed an automated system called MODVOLC to map thermal hot-spots in near real time. For each MODIS image, the algorithm automatically scans each 1 km pixel within it to check for high-temperature hot-spots. When one is found the date, time, location, and intensity are recorded. MODIS looks at every square km of the Earth every 48 hours, once during the day and once during the night, and the presence of two MODIS sensors in space allows at least four hot-spot observations every two days. Each day updated global maps are compiled to display the locations of all hot spots detected in the previous 24 hours. There is a drop-down list with volcano names which allow users to 'zoom-in' and examine the distribution of hot-spots at a variety of spatial scales.
MIROVA Middle InfraRed Observation of Volcanic Activity (MIROVA) is a near real time volcanic hot-spot detection system based on the analysis of MODIS (Moderate Resolution Imaging Spectroradiometer) data. In particular, MIROVA uses the Middle InfraRed Radiation (MIR), measured over target volcanoes, in order to detect, locate and measure the heat radiation sourced from volcanic activity.