Minoan eruption

Coordinates: 36°20′58″N 25°23′58″E / 36.34944°N 25.39944°E / 36.34944; 25.39944
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Satellite image of Thera, November 21, 2000

The Minoan eruption of Thera, also referred to as the Thera eruption or Santorini eruption, was a major catastrophic volcanic eruption (VEI = 6, DRE = 60 km3)[1] which is estimated to have occurred in the late 17th century BCE.[2] The eruption was one of the largest volcanic events on Earth in recorded history.[3][4][5] The eruption destroyed most of the island of Thera (also called Santorini), including the Minoan settlement at Akrotiri as well as communities and agricultural areas on nearby islands and on the coast of Crete, contributing to the collapse of the Minoan culture.

The eruption caused significant climatic changes in the eastern Mediterranean region, Aegean Sea and much of the Northern Hemisphere.[6] There is also evidence that the eruption caused failure of crops in China, inspired certain Greek myths, contributed to turmoil in Egypt, and influenced many of the biblical Exodus stories.[7][6][8] It has been theorized that the Minoan eruption and the destuction of the city at Akrotiri provided the basis for or otherwise inspired Plato's story of Atlantis.[9][10]

Eruption

Volcanic craters on Santorini today

Geological evidence shows the Thera volcano erupted numerous times over several hundred thousand years before the Minoan eruption. In a repeating process, the volcano would violently erupt, then eventually collapse into a roughly circular seawater-filled caldera, with numerous small islands forming the circle. The caldera would slowly refill with magma, building a new volcano, which erupted and then collapsed in an ongoing cyclical process.[11] Another famous volcano known to repeat a similar process is Krakatoa in Indonesia.

Immediately prior to the Minoan eruption, the walls of the caldera formed a nearly continuous ring of islands with the only entrance lying between Thera and the tiny island of Aspronisi.[11] This cataclysmic eruption was centered on a small island just north of the existing island of Nea Kameni in the centre of the then-existing caldera. The northern part of the caldera was refilled by the volcanic ash and lava, then collapsed again.

On Santorini, there is a 60 m (200 ft) thick layer of white tephra that overlies the soil clearly delineating the ground level prior to the eruption. This layer has three distinct bands that indicate the different phases of the eruption.[12] Since no bodies have been found at the Akrotiri site, Floyd W. McCoy, Professor of Geology and Oceanography, University of Hawaiʻi, notes that the local population had advance warning of the impending eruption, leaving the island prior to its destruction. However, the thinness of the first ash layer, along with the noticeable erosion of that layer by the first winter rains before the next layer was deposited, indicate that the volcano gave the local population only a few months warning.[13]

Recent archaeological research by a team of international scientists in 2006 revealed that the Santorini event was much larger than the original estimate of 39 cukm[convert: unknown unit] of Dense-Rock Equivalent (DRE), or total volume of material erupted from the volcano, that was published in 1991.[1] With an estimated DRE in excess of 60 cukm[convert: unknown unit],[5][1] the volume of ejecta was up to ten times what was thrown into the stratosphere by Krakatau in 1883 CE, a well-recorded event, placing the Volcanic Explosivity Index of the Thera eruption at 6. The Thera volcanic events and subsequent ashfall probably sterilized the island, as occurred on Krakatau. Only the Mount Tambora volcanic eruption of 1815 CE released more material into the atmosphere during historic times.[3][4]

Physical consequences

The Plinian eruption resulted in an estimated Template:Km to mi to Template:Km to mi high plume which extended into the stratosphere. In addition, the magma underlying the volcano came into contact with the shallow marine embayment, resulting in a violent steam eruption. The event also generated a Template:M to ft to Template:M to ft high tsunami that devastated the north coast of Crete, Template:Km to mi away. The tsunami impacted coastal towns such as Amnisos, where building walls were knocked out of alignment. On the island of Anafi, Template:Km to mi to the east, ash layers Template:M to ft deep have been found, as well as pumice layers on slopes Template:M to ft above sea level. Elsewhere in the Mediterranean there are pumice deposits which could have been caused by the Thera eruption. Ash layers in cores drilled from the seabed and from lakes in Turkey, however, show that the heaviest ashfall was towards the east and northeast of Santorini. The ash found on Crete is now known to have been from a precursory phase of the eruption, some weeks or months before the main eruptive phases, and would have had little impact on the island.[14] Santorini ash deposits were at one time claimed to have been found in the Nile delta, but this is now known to be a misidentification.[15][16]

There were significant climatic changes during the aftermath of the eruption. Based on the observed changes to the bristlecone pines of California; the bog oaks of Ireland, England, and Germany, and the grain crops of China, it is believed that the plume from the eruption added sufficient particulates to the atmosphere to have reduced temperatures worldwide.[6][4]

Dating

The Minoan eruption provides a fixed point for aligning the entire chronology of the 2nd millennium BCE in the Aegean, because evidence of the eruption is found throughout the region. Despite this evidence, the exact date of the eruption has been difficult to determine. Current estimates based on radiocarbon dating indicate that the eruption occurred between 1630 and 1600 BCE.[17] However, this range of dates conflicts with the previous estimate of approximately 1550 BCE based on archaeological studies utilizing Conventional Egyptian chronology.[7]

Archaeologists developed the Late Bronze Age chronologies of eastern Mediterranean cultures by analyzing the origin of artifacts (for example, items from Crete, mainland Greece, Cyprus or Canaan) found in each archaeological layer.[18] If the artifact's origin can be accurately dated, then it gives a reference date for the layer in which it is found. If the Thera eruption could be associated with a given layer of Cretan (or other) culture, chronologists could use the date of that layer to date the eruption itself. Since Thera's culture at the time of destruction was similar to the Late Minoan IA (LMIA) culture on Crete, LMIA is the baseline to establish chronology elsewhere. The eruption also aligns with Late Cycladic I (LCI) and Late Helladic I (LHI) cultures, but predates Peloponnesian LHI.[19] Archeological digs on Akrotiri have also yielded fragments of nine Syro-Palestinian Middle Bronze II (MBII) gypsum vessels.[18]

At one time, it was believed that data from Greenland ice cores and tree-ring dating, could be useful in ascertaining the exact date of the eruption. A large eruption, identified in ice cores and dated to 1644 BCE (+/- 20 years) was suspected to be Santorini. Previously, it was assumed that the ice core and tree-ring data were related. However, volcanic ash retrieved from an ice core demonstrated that this was not from Santorini, leading to the conclusion that the eruption may have occurred on another date.[14] The late Holocene eruption of the Mount Aniakchak, a volcano in Alaska, is proposed as the most likely source of the minute shards of volcanic glass in the Greenland ice core.[20]

Tree-ring data showed that a large event interfering with normal tree growth in North America occurred in 1629-1628 BCE.[21] Further evidence of an eruption of Thera around 1628 BCE was found in studies of growth depression of European oaks in Sweden.[22]

In 2006, two research papers were published arguing that new radiocarbon analysis dated the eruption between 1627 and 1600 BCE. Samples of wood, bone, and seed collected from various locations in the Aegean, including Santorini, Crete, Rhodes and Turkey, were analyzed at three separate labs in Oxford, Vienna, Austria, and Heidelberg, Germany in order to minimise the chance of a radiocarbon dating error. Results of the analysis indicated a broad dating for the Thera event between 1660 to 1613 BCE.[23]

The date of the eruption of Thera was recently narrowed to between 1627-1600 BCE, with a 95% probability of accuracy, after researchers analyzed material from an olive tree that was found buried beneath a lava flow from the volcano.[24] Because the tree grew on the island, the results may have been affected by volcanic outgassing, which would have skewed the accuracy of the radiometric studies.

Although radiocarbon dating and tree-ring analysis indicate 1600 BCE eruption dating, archeologists believe that the date is contradicted by findings in Egyptian and Theran excavations. For example, some archeologists have found buried Egyptian and Cypriot pottery on Thera that is dated to a later period than the radiometric dates for the eruption. Since the Egyptian historical chronology has been established by numerous archeological studies, the exact date of the eruption remains controversial. If radiocarbon dating is accurate, there would be significant chronological realignment of several Eastern Mediterranean cultures.[25][26]

Historical impact

Minoan civilization

Excavation of Akrotiri on Thera

The Minoan eruption devastated the nearby Minoan settlement at Akrotiri on Santorini, which was entombed in a layer of pumice.[27] It is believed that the eruption also severely affected the Minoan population on Crete, although the extent of the impact is debated. Early theories proposed that ashfall from Thera on the eastern half of Crete choked off plant life, causing starvation of the local population. [28] However, after more thorough field examinations, this theory has lost credibility, as it has been determined that no more than Template:Mm to in of ash fell anywhere on Crete.[29] Other theories have been proposed based on archeological evidence found on Crete indicating that a tsunami, likely associated with the eruption, impacted the coastal areas of Crete and may have severely devastated the Minoan coastal settlements. [30][31][32][6]

Significant Minoan remains have been found above the Late Minoan I era Thera ash layer, implying that the Thera eruption did not cause the immediate downfall of the Minoans. As the Minoans were a sea power and depended on their naval and merchant ships for their livelihood, the Thera eruption caused significant economic hardship to the Minoans. Whether these effects were enough to trigger the downfall of the Minoan civilization is under intense debate. The Mycenaean conquest of the Minoans occurred in Late Minoan II period, not many years after the eruption, and many archaeologists speculate that the eruption induced a crisis in Minoan civilization, which allowed the Mycenaeans to conquer them easily. [33]

Chinese records

Some scientists correlate a volcanic winter from the Minoan eruption with Chinese records documenting the collapse of the Xia dynasty in China. According to the Bamboo Annals, the collapse of the dynasty and the rise of the Shang dynasty, approximately dated to 1618 BCE, were accompanied by "'yellow fog, a dim sun, then three suns, frost in July, famine, and the withering of all five cereals".[7][6]

Impact on Egyptian history

There are no surviving Egyptian records of the eruption, and the absence of such records is sometimes attributed to the general disorder in Egypt around the Second Intermediate Period. However, there are connections between the Thera eruption and the calamities of the Admonitions of Ipuwer, a text from Lower Egypt during the Middle Kingdom or Second Intermediate Period.[34]

Heavy rainstorms which devastated much of Egypt, and were described on the Tempest Stele of Ahmose I, have been attributed to short term climatic changes caused by the Theran eruption.[8][35][36] This theory is not supported by current archaeological evidence which show no pumice layers at Avaris or elsewhere in Lower Egypt during the reigns of Ahmose I and Thutmosis III. While it has been argued that the damage from this storm may have been caused by an earthquake following the Thera Eruption, it has also been suggested that it was caused during a war with the Hyksos, and the storm reference is merely a metaphor for chaos, upon which the Pharaoh was attempting to impose order.[37]

There is a consensus that Egypt, being far away from areas of significant seismic activity, would not be significantly affected by an earthquake in the Aegean. Furthermore, other documents, such as Hatshepsut's Speos Artemidos, depict similar storms, but are clearly speaking figuratively, not literally. Research indicates that this particular stele is just another reference to the Pharaoh overcoming the powers of chaos and darkness.[37]

Greek traditions

The eruption of Thera and volcanic fallout inspired myths of the Titanomachy in Hesiod's Theogony. The background of the Titanomachy is known to derive from the Kumarbi cycle, a Bronze Age Hurrian epic from the Lake Van region. However, the Titanomachy itself could have picked up elements of western Anatolian folk memory as the tale spread westward. Hesiod's lines have been compared with volcanic activity, citing Zeus' thunderbolts as volcanic lightning, the boiling earth and sea as a breach of the magma chamber, immense flame and heat as evidence of phreatic explosions, among many other descriptions.[38]

Biblical traditions

Researchers have claimed that some of the ten plagues resulted from the eruption of Thera; however, the presumed dates of the events of Exodus, approximately 1450 BCE is almost 150 years after the radiometric date of the eruption.[39] According to the Bible, Egypt was beset by such misfortunes as the transforming of their water supply to blood, the infestations of frogs, gnats, and flies, darkness, and violent hail. These effects are compatible with the catastrophic eruption of a volcano in different ways. While the "blood" in the water could have been red tide which is poisonous to human beings, the frogs may have been displaced by the eruption, and their eventual death would have given rise to large numbers of scavenging insects. The darkness could have been the resulting volcanic winter, and the hail the large chunks of ejecta that spewed from the volcano. The tsunami that resulted from the Thera eruption could have been the basis for the parting of the sea, when the sea receded from the shore immediately prior to the arrival of the tsunami. Shallow areas of the sea would have allowed the Israelites, under Moses, safe passage across the Red Sea, while the ensuing tsunami devastated the Egyptian army. Exodus mentions that the Israelites were guided by a "pillar of smoke" during the day and a "pillar of fire" at night, which many scholars have speculated that it refers to volcanic activity.

A recent work attempts to connect the storms and darkness recorded on the Tempest Stele of Ahmose I and the resulting exodus of the Hyksos, with the eruption of Thera and also with the biblical account of storms and darkness during the Israelite's dispute with pharaoh and their Exodus.[40][41] Significantly, the biblical account says that the 'plagues' were caused by an ashfall, a description that would accord well with the expected long-range fallout of ash from Thera.[40][42] However, unambiguous radiometric dating of Thera eruption places it at a date significantly different from the proposed dates of the Exodus from Egypt.[43][44][6]

Panoramic view of caldera rim

References

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  34. ^ Galanopoulos, Angelos Georgiou (1969). Atlantis: The Truth Behind the Legend. Bobbs-Merrill Co. ISBN 978-0672506109. {{cite book}}: Cite has empty unknown parameter: |coauthors= (help)
  35. ^ Goedicke, Hans (1995). 'Studies about Kamose and Ahmose'. Baltimore: David Brown Book Company. pp. Chapter 3. ISBN 0-9613805-8-6. {{cite book}}: Cite has empty unknown parameter: |coauthors= (help)
  36. ^ Foster, KP & Ritner, RK (1996). "Texts, Storms, and the Theran Eruption". Journal of Near Eastern Studies. 57. University of Chicago Press: 1–14.{{cite journal}}: CS1 maint: multiple names: authors list (link)
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  38. ^ Luce, John Victor (1969). The end of Atlantis: New light on an old legend (New Aspects of Antiquity). London: Thames & Hudson. ISBN 978-0500390054. {{cite book}}: Cite has empty unknown parameter: |coauthors= (help)
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  41. ^ Bible: Exodus 9:22-23, 10:21-22.
  42. ^ Bible: Exodus 9:8-10.
  43. ^ Phillips, G (2003). Atlantis and the Ten Plagues of Egypt: The Secret History Hidden in the Valley of the Kings. Bear & Company. ISBN 978-1591430094.
  44. ^ Phillips, G. "Act of God". Graham Phillips. Retrieved 2007-05-22.

Bibliography

  • Callender, G (1999). The Minoans and the Mycenaeans: Aegean Society in the Bronze Age. Oxford University Press. ISBN 0195510283.
  • Forsyth, PY (1997). Thera in the Bronze Age. Peter Lang Publishing. ISBN 0-8204-4889-3.
  • Friedrich, WL (1999). Fire in the Sea, the Santorini Volcano: Natural History and the Legend of Atlantis. Cambridge University Press. ISBN 0-521-65290-1.
  • Greene, MT (2000). Natural Knowledge in Preclassical Antiquity. Johns Hopkins University Press. ISBN 978-0801863714.
  • Phillips, G (2003). Atlantis and the Ten Plagues of Egypt: The Secret History Hidden in the Valley of the Kings. Bear & Company. ISBN 978-1591430094.

External links

36°20′58″N 25°23′58″E / 36.34944°N 25.39944°E / 36.34944; 25.39944

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