Doggerland is a term applied to a shallow region (Fig.1) of the North Sea between Denmark and the North of England that covers an area of around 10,000 sq. miles. The existence of Doggerland was first suggested in a late 19th-century novel by H.G. Wells entitled A Story of the Stone Age. The appellation was coined by Professor Bryony Coles in 1998. However, the name has been applied recently(f) to nearly the totality of the Celtic Shelf (Fig.2). Ulf Erlingsson who had promoted his theory(b) that Atlantis had been located in Ireland (with 98.9% confidence!) has explained that the Egyptian story of Atlantis is the result of an account of megalithic Ireland conflated with a report of the inundation of Doggerland in 6200 BC resulting from a Norwegian storegga(ad)*.
According to some, this flooding may have been the inspiration behind the ‘impassable shoals’ described by Plato following the submergence of Atlantis.
However, it was Rachael Carson who was probably the first to suggest the Dogger Bank as the home of Atlantis in her 1951 book, The Sea Around Us. Later a Scandinavian writer, Nils Olof Bergquist, in his 1971 book, Ymdogat-Atlantis. who appeared next to support this idea.
Other writers such as Jean Deruelle(a), Sylvain Tristan(c) and Guy Gervis(d) have also linked the Dogger Bank with Atlantis. Gervis has written two related papers(k)(l) on the subject. The earliest suggestion of such a connection was briefly supported by Robert Graves[342.39-3]. Rob Waugh, a British journalist, has offered an illustrated article(g) with the provocative title of Britain’s Atlantis found at the Bottom of the North Sea, in which he touches on some of the discoveries made on Doggerland.
>In 2003, Georg Lohle put forward the idea that Atlantis had been situated in the North Sea between Denmark and Britain and destroyed around 2200 BC. He based this speculation on the content of the controversial Oera Linda Book(ac).<
Some have combined Doggerland with exposed land further north, now known as the Viking-Bergen Banks, as having constituted the territory of Atlantis(x).
In 2009 a book was published with the subtitle of The Rediscovery of Doggerland, based on the research of a team led by Professor Vincent Gaffney of the University of Birmingham. In July 2012 the UK’s Daily Mail published(h) an extensive article on Doggerland.
The flooding of the Dogger Bank has been attributed to a 6200 BC event apparently caused by either an outpouring of meltwater from Lake Agassiz in North America or a huge tsunami generated by a Norwegian storegga(e). This event was covered in an extensive article in the November 2012 edition of the BBC Focus magazine. The same article has a sidebar on Atlantis which suggests that there is “perhaps just one archaeological theory that has any serious claim on the myth.” Then, not for the first time, the BBC offered tacit support for the Minoan Hypothesis in spite of the fact that, at least ostensibly, it does not match Plato’s description of Atlantis in terms of either time, size or location and offers no rationale for its stance.
In December 2020, a degree of revisionism was offered in a New Scientist article, which suggested that storegga tsunami may have been less than previously thought. Furthermore, it proposes that parts of what is now the submerged Dogger Bank was not completely flooded by the tsunami, but that parts continued as dry land, perhaps for centuries!(y)
“For a long time, scientists assumed that a tsunami of this kind also caused the Dogger Bank, which was still protruding from the sea, to sink completely. According to a study by researchers at the University of Bradford, however, there was no single, all-destroying tsunami.
Rather, by examining sediments, the researchers were able to prove that only the northern part of Doggerland was submerged after the tsunami and that the destructive force of its floods was probably slowed down by hills or forests on the island.
However, after the water receded, the flooded area recovered over the years, as is demonstrated by the fact that evidence of plants and animals can be found again in the sediment layers above the disrupted tsunami layer.” There is a suggestion that Heligoland may be the last remnant of Doggerland.(ab)
It has been estimated that over a period of a couple of hundred years, the English Channel was also created in a comparable manner(n).
The December 2012 edition of National Geographic magazine also published an informative article on Doggerland and the ongoing work by archaeologists in the region. It considers the Storegga or the Lake Agassiz meltwater to be the cause of Doggerland’s final inundation. For me, it was interesting that a map in the article showed a small area around where I live as the last glaciated region of Ireland.
Alfred de Grazia’s online Q-Mag also published an overview of the Doggerland story in 2012(j) that was originally taken from the German magazine Der Spiegel. The same site has another paper(r) by Jean Deruelle in which he also argues that Doggerland was the location of the Great Plain of Atlantis that stretched from the east of the Dogger Bank and extended as far as what is now Denmark. Plato described the plain as being surrounded by a huge ditch. Then Deruelle, with a flash of ingenuity claims that it was not a ditch but instead was a dyke, designed to hold back the slowing advancing waters of the North Sea that were being fed by deglaciation. He endeavoured to reinforce this claim with the proposal that the Greek word for a ditch, ‘taphros’ can also be used for dyke. This interpretation seems possible according to W.K. Pritchett, a distinguished historian [1622.52.5].
Robert John Langdon has proposed that megalith builders from Africa came to Doggerland as the Ice Age ended and when Doggerland submerged they migrated to what is now mainland Britain, eventually constructing Stonehenge(i). But Langdon has gone further and also claims that Doggerland was actually Atlantis(aa).
A 2014 ‘Drowned Landscapes’ exhibition(m) organised by Dr Richard Bates of the Department of Earth Sciences at St Andrew’s University, reveals in greater detail the flora and fauna, as well as the lives of its inhabitants, of this submerged world. Much of the information was gleaned from data provided by oil and gas companies, combined with artefacts recovered from the seafloor.
Comparable discoveries have been made submerged deep under the waters of Hanö Bay near the coast of Havang, Sweden and dated to about 7000 BC(v).
In 2015 it was announced that €2.5 million in funding from the European Union has enabled a number of archaeologists from Britain’s top universities to team up for what will be the most intensive study of Doggerland so far(o)(q). Joined by experts from the University of Ghent and assisted by the Belgian Navy they located the first identifiable submerged settlements on the floor of the North Sea. Until now (2019) the only evidence of human habitation in the region were occasional artefacts caught up in fishermen’s nets.
In 2016, it was revealed(p) that the ancient footprints of both adults and children had been discovered off the coast of Northumberland, formerly a part of Doggerland. Their feet had apparently been shod.
On Sunday, January 13th, 2019. the UK’s Sunday Express delighted its readers with two Atlantis stories(t)(u). First, the online edition of the paper had a story by one of its reporters, with an ‘Atlantis Discovered’ headline claiming that the remains of an ancient 8,000-year-old city, home to ‘tens of thousands’ of people, had been discovered in the North Sea, in a huge region sometimes referred to as Doggerland. The reporter cites Dr Richard Bates in support of this account. Unfortunately, the 2012 comments by Dr Bates never mentioned ‘a city’, but a vast area occupied by ‘tens of thousands’ of people, presumably early farmers(s). Then the same edition of the same paper by the same ‘reporter’ with another ‘Atlantis Found?’ headline, offered a video clip of the Maltese island of Filfla, while the commentator told us that Plato had said that a devastating earthquake had destroyed Atlantis it was finished off by an eruption. This is factually incorrect as Plato never mentioned an eruption. These two accounts are a sad reflection of the quality of media reporting today.
In 2020, David Keys, author of Catastrophe  wrote an article for the UK’s Independent newspaper outlining the most recent research into the 6200 BC tsunami that destroyed Doggerland. “It is estimated that multiple giant waves inundated some 2,700 square miles of land – from Scotland in the north to Norfolk in the south.
New underwater research carried out by the universities of Bradford, Warwick, St Andrews and Wales has for the first time discovered that the tsunami devastated parts of East Anglia and adjacent land which is now submerged beneath the southern part of the North Sea.” (z)
(d) See: https://web.archive.org/web/20180320072706/https://nwepexplore.com/
(e) See: https://web.archive.org/web/20160303180752/https://arheologija.ff.uni-lj.si/documenta/pdf35/weninger35.pdf
(k) See: Archive: 2073
(l) See: Archive 2074
(y) Tiny island survived tsunami that helped separate Britain and Europe | New Scientist
(ac) Atlantis is a myth or real past (archive.org) *
(ad) https://www.academia.edu/437214/The_Catastrophic_Final_Flooding_of_Doggerland_by_the_Storegga_Slide_Tsunami *
Volcanoes at their most explosive have played an important part in the mythologies and histories of humans.
A recent Irish Times article (10/2/22) observed “Despite the small number of volcanoes here, European culture has been deeply influenced by volcanic activity. In ancient Greek mythology, volcanoes were where the Olympian gods had imprisoned their rivals, the Titans. When the Romans adopted the Greek religion, Mount Etna became the home of Vulcan, the god of fire and blacksmiths, who worked his forges underneath the mountain.”(u)
Volcanism is not part of the Atlantis story as related by Plato. His narrative clearly attributes the destruction of Atlantis and the Athenians to flooding and earthquake. Admittedly, flooding can be the result of some volcanic activity, but in the absence of any evidence to support this view in the case of Atlantis, the idea is only supposition. While most accept that Atlantis was named after its first king, Atlas, Frank Joseph’s fertile imagination suggests that ‘the island of Atlantis was named after its chief mountain, a dormant volcano’. For those that place Atlantis in the Atlantic the idea of volcanic or seismic activity as the cause of the flooding of Atlantis AND Athens is hard pressed to suggest a location for this activity that would explain two catastrophes two thousand miles or more apart.
However, the red, white and black stone that Plato may be related to volcanic eruptions that produce rocks of tufa (red), pumice (white) and lava (black). Pumice has been found at various locations in Egypt(v) and identified as originating not only from Thera but also from eruptions on the Greek islands of Nisyros and Giali as well as the Italian Lipari Islands(o). Pumice has a chemical fingerprint which enables its source to be identified(t).
Jelle Zeilinga de Boer and Donald Sanders are the authors of Volcanoes in Human History which supports the idea that the eruption of Thera was a factor in the development of the Atlantis story and also suggests a link with the Flood of Deucalion.
Nevertheless, a recent book by William Lauritzen, The Invention of God, makes a convincing case for accepting volcanic activity as the inspiration behind some of the imagery of ancient mythologies and most major religions. A recent article(i) on the BBC website expanded on this further. Lauritzen also suggests that the pyramids were meant to represent volcanoes.
The most active volcanic region of Europe is to be found in Italy, where Etna and Stromboli have been continuously erupting for thousands of years(b). There is a report that a 6000 BC extreme eruption of Etna resulted in a tsunami 130 feet in height which swept the Mediterranean(c). However, the most devastating prehistoric volcanic eruption discovered so far seems to have been in Siberia 252 million years, which may have led to the most extensive mass extinction of life on earth(e). This is now rivalled by Tamu Massif in the Pacific mentioned below.
The cataclysmic volcanic eruption of Thera in the second millennium BC has had a strong level of support as the cause of Atlantis’ collapse, a view endorsed by recent television documentaries and an IMAX film. The Greek volcanologist, George Vougioukalakis, whose research is featured in the aforementioned film, is convinced that the eruption of Santorini offers the most rational explanation for the truth behind Plato’s story(a). However, he dissents from the recently expressed view that pumice found on the Northern Sinai Peninsula was transported there by a tsunami generated by the eruption of Thera and prefers to believe their transportation there was by normal sea currents.
Apart from Santorini, Jim Allen had initially proposed the Andean village of Quillacas, which lies on top of a volcano, as the site of Atlantis, but later found that the nearby site of Pampa Aullagas had a greater correspondence with the description of Atlantis. More recently Richard W. Welch has suggested the eruption of a supervolcano in the Atlantic as the cause of Atlantis’ demise. And so the idea of the volcanic destruction of Atlantis still has some support!
Since January 2011, Santorini has shown some signs of a volcanic reawakening(d).
In September 2013 studies revealed(f) what may be the location of the largest volcano ever to have erupted on our planet. It would have been the size of the British Isles and situated underwater in the northwest Pacific and known as Tamu Massif. It would have rivalled the Olympus Mons on Mars, but fortunately, has been dormant for 140 million years.
March 2014 saw a post on Dale Drinnon’s website(g) take the linkage between Atlantis and a volcano rather further with the suggestion that “the capital city of Atlantis in Plato’s description was built in the caldera of an extinct volcano and that many of the features of the description are volcanic in origin. The “Poseidon’ temple is the pyramidal volcanic neck, an erosional feature that stood out like a conical mound some hundreds of feet in diameter and possibly some hundreds of feet high on the outside. there was a tunnel bored through this aligned East and West, to allow the sunlight in at the beginning and the end of the day for certain rituals.”
In December 2014 a report from Princeton University revealed that a massive series of volcanic eruptions 66 million years ago can be aligned with the extinction of the dinosaurs and should be included as part of the cause of that extinction along with the Yucatan meteorite impact(h). However, in February 2021, a report from Harvard proposed that the Yucatan impactor was a comet rather than an asteroid or meteor(s).
In 2009, it was reported(q) that another example of contemporaneous meteorite impact and flood volcanism was identified in Belarus.
The Laki volcano in Iceland erupted in 1783, killing 9,000 local people but more dramatically causing the Nile Valley population to be cut by a sixth, according to a study published by scientists at Rutgers, The State University of New Jersey. “The study is the first to conclusively establish the linkage between high-latitude eruptions and the water supply in North Africa”(j).
A 2015 report(k) suggests that a series of North American volcanic eruptions in 536 AD had such a detrimental effect on the climate of Europe that contributed to the demise of the Roman Empire.
Furthermore, there is now evidence(m) that the eruption of El Chicon volcano in Southern Mexico around 540 AD led to the disruption of the Maya civilisation. Can there be a connection between these two events? In 2020, it was reported that the massive Tierra Blanca Joven eruption of the Ilopango volcano in El Salvador had been accurately dated to within a year or two of 431 AD, which also devastated Maya communities within an eighty-kilometre radius(r).
However, David Keys in his book, Catastrophe, has proposed that a massive eruption of Krakatoa around 535 AD caused disruption on a global scale. Matthew Toohey from the GEOMAR Helmholtz Centre for Ocean Research in Kiel, Germany, has suggested the possibility of a double event involving both El Chicon and Krakatoa!
Recently the longest (1,200 miles) continental volcano chain was identified in Australia(l).
The BBC reported(n) in 2016 that “Deep-sea volcanoes are so remote until recently we did not even know they existed” and although “We do not see them erupt, yet more than half of the Earth’s crust can be attributed to their dramatic explosions” and “In fact, the mid-ocean ridges form the largest volcanic systems on Earth. But as they are largely hidden from sight, they have long remained elusive.”
In July 2017, the BBC offered an interesting article on the potential ongoing threat from supervolcanoes around our globe(p) and the inevitability of a future eruption.
(s) https://www.cbsnews.com/boston/news/comet-asteroid-dinosaurs-killed-harvard-theory-chicxulub-impactor/ *
(v) https://www.santorini.com/santorinivolcano/atlantisaffect-egypt.htm *
A Tsunami was probably first described in the 5th century BC by Thucydides when he wrote “in my opinion, the cause of the phenomenon was this: where the earthquake was most violent, the sea receded and was then pushed back with even greater violence, thus bringing about a flood. Such a thing would not have happened without an earthquake” (Peloponnesian War, Book III.89)(b). However, there are also conditions that can produce tsunamis inland, such as occurred around 500 AD inundating Geneva in the Alps(k)(m).
The word ‘tsunami’ first appeared in an English language publication in the September 1896 edition of National Geographic Magazine in which the devastation caused by an earthquake wave in Japan was graphically described.
Recent studies(g) indicate that a similar tsunami saved the Greek town of Nea Poteidaia from a Persian attack in 479 BC. Herodotus in reporting the event attributed the Persian defeat to divine intervention by Poseidon, god of the sea.
A similar event on an even greater scale has been one of the suggestions as the possible cause of the flooding of Atlantis. A 2002 paper(a), by Louisiana State University geologist, Gary Byerly and his team, identified an ancient asteroid impact that generated a tsunami that “swept around the earth several times, inundating everything except the mountains”. The study of ancient tsunamis is at a very early stage of development.
A 2019 report was published online in 2022 in which it was revealed that the Yucatan asteroid impact credited with wiping out the dinosaurs 65 million years ago generated mile-high tsunamis that travelled halfway around the world. One wave was estimated to have been 1.8 miles high(ae).
Ivan T. Sanderson in one of his books, Investigating the Unexplained , recounts an 1863 report of a 200-foot high tsunami that sped up the Ganges and Houghli Rivers in India killing tens of thousands of people without ‘snapping-off’ trees. He contrasts this with the tree stumps covering acres around East Creek, New Jersey that have all been broken off at the same height and where he suggested that only a tsunami could have caused such widespread and uniform destruction. In view of the fact that some of these cedar trees had six-foot diameter trunks, he speculates on the possible size of a tsunami that could bring about such extreme damage.
Perhaps even more relevant to the study of Atlantis is the evidence gathered by Jürgen Spanuth in his chapter on the ‘Natural Catastrophes of the 13th Century’ including an interesting section on tsunamis [015.167].
Marc-André Gutscher of the University of Western Brittany in Plouzané, France, has discovered evidence of an ancient tsunami on Spartel Island, an Atlantis candidate, in the Gulf of Cadiz. Georgeos Diaz-Montexano has pointed out that Josephus, the 1st-century Jewish historian, seems to describe the devastation caused by its assault on the Atlantic coast of Spain and Portugal at the time of the Lusitanians and Cantabrians in the 1st millennium BC.
In the late 1970s, Booth & Fitch suggested in Earthshock that tsunamis may have been responsible for the devastation of Atlantis, an idea that has gained in popularity.
Sergio Frau has postulated that the Atlantean civilisation on Sardinia was destroyed by a tsunami.
Professor Stefano Tinti of Bologna University visited Sardinia and explained(r) “that until the 1980s no one was aware that tidal waves had occurred in the Mediterranean. But since 2004 scientists have identified 350 events of this type over a 2,500-year period,” and regarding the Sardinian tsunami “So what would have been required in our case?” he then asked. “We’re talking about a huge volume of water, some 500 metres high [the elevation up to which the nuraghi were affected]. Only a comet could do that if the impact occurred very close to the coast and in a very specific direction,” he asserted. An event of this sort may have occurred near Cagliari, with the resulting wave devastating the plain of Campidano.”
Tinti has also noted(w) that generally speaking, the majority of tsunamis are generated by seismic rather than volcanic activity. Globally, volcanic tsunamis account for only 2% of the total, however, the profusion of volcanoes in Southern Italy has considerably increased this percentage. Furthermore, according to a recent article on the BBC website “The scale of the tsunami hazard from volcanoes that collapse into the sea has been underestimated.”(x)
A 2022 report of a recent study(ac) revealed some new interesting information.
“Archaeologists have found evidence of the largest known earthquake in human history — a terrifying magnitude-9.5 megaquake that caused a 5,000-mile-long (8,000 kilometres) tsunami and prompted human populations to abandon nearby coastlines for 1,000 years.
The earthquake struck about 3,800 years ago in what is now northern Chile when a tectonic plate rupture lifted the region’s coastline. The subsequent tsunami was so powerful, it created waves as high as 66 feet (20 meters) and travelled all the way to New Zealand, where it hurled car-size boulders hundreds of miles inland, the researchers found.”
More recently, Dhani Irwanto has written about the probable effect of tsunamis on his Indonesian Atlantis(y). Studies of the sedimentary record in a sea cave in Sumatra have revealed the frequency and strength of tsunamis in the region over a five-thousand-year span from 5900 BC until 900 BC(u).
Tsunamis are also associated with the destruction on Crete following the eruption of Thera in the 2nd millennium BC. A TV documentary entitled Sinking Atlantis(i), provided graphic evidence of tsunami damage on Minoan Crete(h).
J.V.Luce cited[120.119] a number of local legends from around the Aegean that may have originated with the tsunami that followed the eruption on Thera.
However, the extent of this damage is strongly contested by W. Sheppard Baird(j) and he proposes instead that it was in fact more likely to have been a pyroclastic surge from the Theran eruption that caused the most damage.
A recent report(d) concludes that a large tsunami generated by the volcanic activity of Mt. Etna around 6000 BC produced waves up to 43 feet high that struck the coasts of Greece and Libya. This event would have caused devastation on nearby Malta, where evidence of past tsunamis was published in the journal Zeitschrift für Geomorphologie. The research was carried out over three years by scientists from the University of Portsmouth, led by Dr Malcolm Bray with assistance from colleagues at the Department of Geography at the University of Malta(n). A 1693 earthquake generated the earliest recorded tsunami on Malta and as recent as 1908 Malta was hit by a tsunami that resulted from a catastrophic earthquake in the vicinity of the Strait of Messina(p).
On the Atlantic west coast of Ireland, we have a 250 km2 region, in County Clare, known as the Burren, which consists of limestone denuded of soil cover. Recently, strong evidence was discovered suggesting a 4000 BC tsunami in the region(o). For me, the karst landscape of the Burren is reminiscent of parts of Malta.
Plato’s description does not support the idea of a tsunami as the primary cause of Atlantis’ inundation since tsunamis will eventually subside and return to the ocean, whereas Atlantis was still underwater centuries after the event, causing a permanent navigation hazard. John Michael Greer makes a similar point [345.126] in relation to the megatsunami which struck Madagascar in 2800 BC. Evidence of other ancient megatsunamis in Hawaii was presented at the 2012 meeting of the American Geophysical Union(l). The power of megatsunamis is highlighted in an article on the UK’s MailOnline website(t). Atlantisforschung also offers a lengthy article about megatsunamis(af).
Recent excavations at Olympia on the Peloponnese peninsula, the location of the original Olympic Games, have pointed to the site having been repeatedly hit by devastating tsunamis during the past 7,000 years(c).
The Bunurong tribe in Australia has a ‘myth’ that explains the creation of Melbourne’s Port Philip Bay. A recent article(e) has linked this to a tsunami that resulted from the impact of Comet Manhuika southwest of New Zealand in the 15th century. A more cautious view of this event is expressed elsewhere(f).
The excellent livescience.com website has an interesting list of ten history-making tsunamis(q), while Wikipedia offers an extensive list of European tsunamis from prehistoric times until the present(s).
A 100-metre-high tsunami, caused by a landslide, one of the highest ever recorded was experienced in a remote area of Greenland in June 2017. Four lives were lost and eleven houses were destroyed in the fishing village of Nuugaatsiaq, located on an island about 20 kilometres away(v).
The Greenland event would have been greatly overshadowed, literally, by the tsunami generated by the asteroid that struck Mexico’s Yucatán Peninsula around 66 million years ago that killed off the dinosaurs. According to a 2021 report(z) it has been estimated that the impact produced a tsunami nearly a mile high!
In 2020, David Keys, author of Catastrophe  wrote an article for the UK’s Independent newspaper outlining the most recent research into the 6200 BC tsunami that destroyed Doggerland. “It is estimated that multiple giant waves inundated some 2,700 square miles of land – from Scotland in the north to Norfolk in the south.
New underwater research carried out by the universities of Bradford, Warwick, St Andrews and Wales has for the first time discovered that the tsunami devastated parts of East Anglia and adjacent land which is now submerged beneath the southern part of the North Sea.” (ab)
Stuart L. Harris published a paper in 2020 entitled 5760 BC: tsunami at Rhine Valley caused by Planet X(ad). This was based on a translation of a long inscription written on a cliff face in Germany. Harris explains that in 5760 BC “satellites from a mysterious Planet X struck the continental shelf of Texas “that pushed a piece of the shelf the size of Massachusets into the Gulf. Above the displaced shelf, the sea towered 1.9 km high. The resulting tsunami dispersed in all directions and obliterated coastal communities around the North Atlantic.
In Germany, it surged over the Ruur Mountains west of the Rhine Valley, flooded the middle Rhine between Mainz and Karlsruhe, and continued over the eastern escarpment toward Heilbronn. It left extensive ripple marks in the Rhine Valley and the eastern plateau.” Harris offers some interesting data to support this claim.”
On August 12, 2021, within minutes of each other, two earthquakes struck the South Sandwich Islands of the South Atlantic. National Geographic reported “These rumblings, which occurred on August 12, 2021, were not unusual on their own, since the islands sit atop a combative meeting of tectonic plates. The odd part is that they were followed by a tsunami powerful enough to show up on distant shores along the Atlantic, Pacific, and Indian Oceans. Although the swell wasn’t destructive, it was the first since the catastrophic tsunami of 2004 to be recorded in three different oceans(aa).“
>The Live Science website reported(ag) “On Jan. 15, 2022, the Hunga Tonga-Hunga Ha’apai submarine volcano — a large, cone-shaped mountain located near the islands of the Kingdom of Tonga in the South Pacific — erupted with a violent explosion. The eruption generated the highest-ever recorded volcanic plume, which reached 35 miles (57 kilometers) tall. The outburst triggered tsunamis as far away as the Caribbean, as well as atmospheric waves that traveled around the globe several times.” and “The Tonga underwater volcanic eruption rivaled the strength of the largest U.S. nuclear bomb and produced a “mega-tsunami” nearly the height of a 30-story skyscraper.”<
(a) See: Archive 2931
(c) Olympia hypothesis: Tsunamis buried the cult site on the Peloponnese (archive.org)
(h) Sinking Atlantis | Full Episode | Secrets of the Dead | PBS (archive.org)
(k) Tsunamis in the Alps? (archive.org)
(l) See: https://web.archive.org/web/20161209170519/https://www.livescience.com/25293-hawaii-giant-tsunami-landslides.html
(u) 5,000-Year-Long Tsunami Record Found in Guano-Encrusted Sumatran Cave – Seeker (archive.org)
(z) Chicxulub Asteroid Impact Created a Giant Tsunami Nearly a Mile High | Mysterious Universe
(aa) Source of mysterious global tsunami found near Antarctica (nationalgeographic.com)
(ac) Scientists find evidence for biggest earthquake in human history | Live Science
(ae) Tsunami from dinosaur-killing asteroid had mile-high waves and reached halfway across the world | Live Science
(af) Mega-Tsunami – Atlantisforschung.de (atlantisforschung-de.translate.goog)
(ag) 1st mega-tsunami on record since antiquity was triggered by Tonga volcanic eruption | Live Science *
Krakatoa, the Indonesian volcano that erupted so violently in 1883, produced many recorded effects that are frequently used as yardsticks when discussing the possible consequences of similar events in the past, particularly the second millennium BC destruction of Thera, a leading contender in the Atlantis stakes. The Krakatoan eruption had a detrimental effect on global climates for some years.
However, this was not the first time that the eruption of Krakatoa had calamitous global consequences. David Keys (image below), an archaeological journalist, details the effects of an eruption of Krakatoa in 534/5 AD, in his book, Catastrophe. This book was the subject of a documentary on the UK’s Channel Four(d). A few years before his book was published Keys wrote an article entitled: Comet may have caused catastrophe on Earth(e), in which he dismissed a volcanic eruption as the cause of the 6th century crop failures, plagues, wars, social unrest and widespread deaths, yet his subsequent book advocates[p.269] a massive eruption of Krakatoa as the culprit. Around the same time, Mike Baillie was about to publish his Exodus to Arthur  in which he argued
strongly that the mid-6th century range of catastrophes were caused by a cometary impact. Five years later, Baillie co-authored, with Patrick McCafferty, another book linking comets with Irish mythology, The Celtic Gods, in which they point out that Keys’ proposed huge eruption has not been reflected in any of the various Greenland ice cores in the form of a volcanic-acid spike[0112.164]!
This debate regarding the cause of the global catastrophes in the mid-6th century would appear to be far from over. A 2015 report(f) suggests that a series of North American volcanic eruptions in 536 AD had such a detrimental effect on the climate of Europe that it contributed to the final demise of the Roman Empire. Furthermore, there is now evidence(g) that the eruption of the El Chicon volcano in Southern Mexico around 540 AD led to the disruption of the Maya civilisation. Matthew Toohey from the GEOMAR Helmholtz Centre for Ocean Research in Kiel, Germany, has suggested the possibility of a double event!
Early in the 19thcentury the eruption of Tambora, also in Indonesia, was even more powerful(a). However, the most violent eruption of the last two million years also took place in Indonesia 74,000 years ago, when Mt. Toba erupted with devastating consequences for the Indian sub-continent and further afield(b). The Toba caldera is now Lake Toba. A recent study suggested(c) that the Mt.Toba event led to the near extinction of humans.
The Theran eruption was equivalent to the 19th century Krakatoa event when measured according to a volcanic explosivity index (VEI), based on quantitative criteria, as discussed in Walter Friedrich’s book on Thera.*Within a decade, the explosivity figure for Thera was reassessed by Professor Floyd McCoy of the University of Hawaii, who has written and broadcast extensively on the matter of the Late Bonze Age eruption of Thera. This included a paper delivered to the 2005 Atlantis Conference. In it, he noted that “New finds of tephra – ash and pumice – both on land and on the seafloor indicate a far larger eruption than previously assumed, suggesting a volume of at least 100 km3 of tephra (bulk volume) ejected, perhaps more. Such a volume ranks the eruption on the Volcanic Explosivity Index (VEI) at 7.0, equivalent or larger than the 1815 eruption of Tambora (‘the year without a summer’), ten times larger than the eruption of Krakatau in 1883, and approximately 100 times that of Mt. St. Helens in 1980.” [629.311]*
Today, when we watch the 20th century eruption of Mt. St. Helens or the Montserrat volcanoes on our televisions, it gives no real notion of the incredible power of these events or the absolute terror that was experienced by those living close by.
*(d) https://www.davidkeys.co.uk/davids-documentaries/ (Link broken Nov. 2018)*