FYI May 03, 2019

On This Day

1481 – The largest of three earthquakes strikes the island of Rhodes and causes an estimated 30,000 casualties.
The 1481 Rhodes earthquake occurred at 3:00 in the morning on 3 May. It triggered a small tsunami, which caused local flooding. There were an estimated 30,000 casualties. It was the largest of a series of earthquakes that affected Rhodes, starting on 15 March 1481, continuing until January 1482.

Tectonic setting

The island of Rhodes lies on part of the boundary between the Aegean Sea and African plates. The tectonic setting is complex, with a Neogene history that includes periods of thrusting, extension and strike slip. It sits in what is known as the Hellenic arc and is a modern-day Grecian city.[1] Greece and specifically the Hellenic arc is in an area that is highly vulnerable to seismic activity, and historically always has been, dating back to the 226 BC Rhodes earthquake.[2] This is because the region sits on many fault lines, including the Turkish-Greek plate boundary. Currently the island of Rhodes is undergoing a counter-clockwise rotation (17° ±5° in the last 800,000 years) associated with the south Aegean sinistral strike-slip fault system.[3] The island had also been tilted to the northwest during the Pleistocene, an uplift attributed to a reverse fault lying just to the east of Rhodes.

Sources refer to destruction in Rhodes Town; the Palace of the Grand Master of the Knights of Rhodes was sufficiently damaged to require immediate rebuilding (Rhodes was at the time under siege by the Turks).[4] The damage caused by the earthquakes led to a wave of rebuilding after 1481.[5] Damage from the tsunami was said to be greater than from the earthquake. The tsunami caused a large ship to break free from its moorings. It (or another ship) later sank with loss of all its crew after running onto a reef.[6]


The tsunami appears to have been relatively minor, estimated at a maximum 1.8 m. However, it was observed on the Levantine coasts and a tsunami sediment layer found at Dalaman, on the southwest coast of Turkey. Although the studies on sediment transport from tsunamis are limited, it is probable that the tsunami can be dated 1473 ±46. The sediment found and studied appears to be consistent with the aforementioned tsunami.[7][8]

There was a major foreshock on 15 March of that year. Following the mainshock on 3 May, earthquakes (presumably aftershocks) continued until January 1482, with large aftershocks on 5 May, 12 May, 3 October and 18 December. The estimated magnitude for the mainshock is 7.1 on the surface wave magnitude scale.[6]


Born On This Day

1695 – Henri Pitot, French physicist and engineer, invented the Pitot tube (d. 1771)
Henri Pitot (May 3, 1695 – December 27, 1771) was a French hydraulic engineer and the inventor of the pitot tube.

In a pitot tube, the height of the fluid column is proportional to the square of the velocity of the fluid at the depth of the inlet to the pitot tube. This relationship was discovered by Henri Pitot in 1732, when he was assigned the task of measuring the flow in the river Seine.

He rose to fame with the design of the Aqueduc de Saint-Clément near Montpellier (the construction lasted thirteen years), and the extension of Pont du Gard in Nîmes. In 1724, he became a member of the French Academy of Sciences, and in 1740 a fellow of the Royal Society.

The Pitot theorem of plane geometry is named after him.

Rue Henri Pitot in Carcassonne is named after him.


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