Santorini

Photo of this volcano
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 36.404°N
  • 25.396°E

  • 367 m
    1204 ft

  • 212040
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

The Global Volcanism Program has no activity reports for Santorini.

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The Global Volcanism Program has no Bulletin Reports available for Santorini.

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.

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).
See title for photo information.
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).
See title for photo information.
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).
See title for photo information.
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).
See title for photo information.
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).
See title for photo information.
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).
See title for photo information.
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).
See title for photo information.
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).
See title for photo information.
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).
See title for photo information.
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).
See title for photo information.
Palaea Kameni (Thia) Island in the center of the photo was formed by the extrusion of lava flows during a 46-47 CE 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).
See title for photo information.
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 BCE.

Photo by Lee Siebert, 1994 (Smithsonian Institution)
See title for photo information.
The crater in the foreground was formed during an eruption from 1570-1573 CE. 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)
See title for photo information.
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)
See title for photo information.
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)
See title for photo information.
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 CE, and the gentler slopes in front of it date back to 726 CE. The highly explosive eruption of the summer of 726 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)
See title for photo information.
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 BCE. 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 BCE.

ASTER satellite image, 2000 (NASA, http://eol.jsc.nasa.gov/).
See title for photo information.

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

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