Raise your hand if you knew Newfoundland was devastated by a major tsunami in 1929

Reposted from Polar Bear Science

Posted on December 10, 2020 |

Only a few months ago, I discovered that the Burin Peninsula on the south shore of Newfoundland in eastern Canada was devastated by a major tsunami in 1929, which inspired my new short novel, UPHEAVAL. My story is about an ice tsunami that devastates Cape Breton Island in 2026 (an ocean wave triggered by an earthquake or underwater landslide becomes an ice tsunami when it travels under sea ice before it comes ashore). Here are the details on that little-known 1929 tsunami event – which even a colleague who is a tsunami advisor for his area of Alaska and family members who had lived in Nova Scotia had never heard of before.

Summary

On 18 November 1929 a tsunami struck Newfoundland’s Burin Peninsula and caused considerable loss of life and property. Giant waves hit the coast at 40 km/hr, flooding dozens of communities and washing entire homes out to sea. The disaster killed 28 people and left hundreds more homeless or destitute. It was the most destructive earthquake-related event in Newfoundland and Labrador’s history and occurred at the beginning of a worldwide depression.

Despite the magnitude of the earthquake which precipitated the tsunami, no one in Newfoundland and Labrador anticipated the approaching danger. Large-scale seismic events are rare in eastern North America and virtually non-existent in Newfoundland and Labrador; in 1929, the country did not even possess a seismograph or tide gauge which could warn of the tsunami. Moreover, a recent storm had severed the single telegraph line linking the Burin Peninsula with the rest of the island; it was not until almost three days after the tsunami struck that the Squires government learned of the disaster and was able to send help.

‘Grand Banks’ Earthquake

At 5:02 p.m. on Monday 18 November 1929, an underwater earthquake occurred on the southern edge Grand Banks, about 265 kilometres south of Newfoundland’s Burin Peninsula. It measured 7.2 on the Richter scale and was recorded in locations as far west as New York and Montreal and as far east as Portugal. On the Burin Peninsula, ground tremors lasted for about five minutes but did not cause any serious damage to houses or other structures. No one in the area had experienced an earthquake before, and although a few people understood what was happening, none imagined the tsunami that would follow.

On the Grand Banks, the earthquake triggered a sizeable underwater landslide, which in turn forced a series of large waves across the ocean’s surface. The tsunami raced towards Newfoundland at speeds of up to 140 km/hr, before slowing to about 40 km/hr in shallower water. It registered on tide gauges in Bermuda, Portugal, the Azores, and along the United States’ eastern coast. Newfoundland, however, had no knowledge of the giant waves that were quickly approaching its southern coast.
Tsunami Reaches Burin Peninsula

At about 7:30 p.m., residents along the Burin Peninsula noticed a rapid drop in sea level as the lowest point of the tsunami’s first wave, known as a trough, reached the coast. As the water receded, it exposed portions of the ocean floor that were normally submerged and caused boats docked at various harbours to tumble over onto their sides. Minutes later, three successive waves hit the shore and water levels rose dramatically. In most places, the sea level swelled three to seven metres above normal, but in some of the peninsula’s long narrow bays, such as at Port au Bras, St. Lawrence, and Taylor’s Bay, the water rose by between 13 and 27 metres.

The force of the waves lifted houses off their foundations, swept schooners and other vessels out to sea, destroyed stages and flakes, and damaged wharves, fish stores, and other structures along the peninsula’s extensive coastline. Approximately 127,000 kilograms of salt cod were also washed away by the tsunami, which affected more than 40 communities on the Burin Peninsula. At Point au Gaul, giant waves destroyed close to 100 buildings as well as much of the community’s fishing gear and food supplies; St. Lawrence lost all of its flakes, stages, and motor boats. Government assessment later placed property damage on the Burin Peninsula at $1 million.

Worse than the damage to property, however, was the loss of human life. The tsunami killed 28 people in southern Newfoundland, which is more than any other documented earthquake-related event in Canadian history. Twenty-five victims drowned during the disaster (six bodies were washed out to sea and never found) and another three later died from shock or other tsunami-related conditions. The deaths were confined to six communities: Allan’s Island, Kelly’s Cove, Point au Gaul, Lord’s Cove, Taylor’s Bay, and Port au Bras. Fortunately, the tsunami struck on a calm evening when most people were still awake and could quickly react to the rising water; many managed to evacuate their homes and flee to higher ground.

Read the whole thing here.

See also The 1929 Magnitude 7.2 “Grand Banks” earthquake and tsunami

’90 years later, a tsunami in southern Newfoundland still brings vivid memories‘ (CBC News report, Nov. 18 2019):

The Newfoundland Tsunami of November 18, 1929: An Examination of the Twenty-eight Deaths of the “South Coast Disaster” (2006):

Ruffman, Alan. 1994. The November 18, 1929 ‘ Tidal Wave’: Canada’s Most Tragic Earthquake [Abstract]. Atlantic Geology, Vol. 30, No. 2, July, pp. 157-158.

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December 12, 2020 at 08:56AM

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