sexta-feira, novembro 04, 2022

Um dos mais fortes sismos do século XX foi há setenta anos, na península de Kamchatka, Rússia

  
The main earthquake struck at 16:58 GMT (04:58 local time) on November 4, 1952. Initially assigned a magnitude of 8.2, the quake was revised to 9.0 Mw in later years. A large tsunami resulted, causing destruction and loss of life around the Kamchatka peninsula and the Kuril Islands. Hawaii was also struck, with estimated damages of up to US$1 million and livestock losses, but no human casualties were recorded. Japan reported no casualties or damage. The tsunami reached as far as Alaska, Chile, and New Zealand.
The hypocentre was located at 52.75°N 159.5°E, at a depth of 30 km. The length of the subduction zone fracture was 600 km. Aftershocks were recorded in an area of approximately 247,000 km2, at depths of between 40 and 60 km. A recent analysis of the tsunami runup distribution based on historical and geological records give some indication as to the slip distribution of the rupture.
 
   
View of the Severo-Kurilsk port. In 1952 a whole settlement was located there. The modern town was rebuilt in another place.

1952 Severo-Kurilsk Tsunami was a major tsunami that hit Severo-Kurilsk, Kuril Islands, Sakhalin Oblast, Russian SFSR, USSR, which occurred on 5 November 1952 at about 5 a.m. It led to the destruction of many settlements in Sakhalin Oblast and Kamchatka Oblast, while the main impact struck the town of Severo-Kurilsk. The tsunami was generated by a major earthquake in the Pacific Ocean, 130 km from the shore of Kamchatka, with an estimated magnitude of 9.0. There were three waves about 15-18 m high. After the earthquake the majority of the Severo-Kurilsk citizens fled to the surrounding hills, where they escaped the first wave. However, most of them returned to the town and were killed by the second wave. The third wave was minor. According to the authorities, out of a population of 6,000 people, 2,336 died.
The remaining survivors were evacuated to continental Russia. The settlement was then rebuilt in another location.
 
NOTA: embora provocando poucos mortos, dada a sua magnitude, este sismo é considerado atualmente o 12º com mais elevada magnitude, segundo a Wikipédia:
 
Rank Date Location Event Magnitude
1 May 22, 1960 Chile Valdivia, Chile 1960 Valdivia earthquake 9.4–9.6
2 June 11, 1585 United States Pacific Ocean, Aleutian Islands (now Alaska, United States) 1585 Aleutian Islands earthquake 9.25 (est.)
3 July 8, 1730 Chile Valparaiso, Chile (then part of the Spanish Empire) 1730 Valparaíso earthquake 9.1–9.3 (est.)
4 March 27, 1964 United States Prince William Sound, Alaska, United States 1964 Alaska earthquake 9.2
5 December 26, 2004 Indonesia Indian Ocean, Sumatra, Indonesia 2004 Indian Ocean earthquake 9.1–9.3
6 October 17, 1737 Russia Kamchatka Peninsula, Russia 1737 Kamchatka earthquake 9.0–9.3 (est.)
7 November 17, 1837 Chile Valdivia, Chile 1837 Valdivia earthquake 8.8–9.5 (est.)
8 March 11, 2011 Japan Pacific Ocean, Tōhoku region, Japan 2011 Tōhoku earthquake 9.1
9 October 28, 1707 Japan Pacific Ocean, Shikoku region, Japan 1707 Hōei earthquake 8.7–9.3 (est.) 
10 November 25, 1833 Indonesia Sumatra, Indonesia (then part of the Dutch East Indies) 1833 Sumatra earthquake 8.8–9.2 (est.)
11 May 17, 1841 Russia Kamchatka, Russian Empire 1841 Kamchatka earthquake 9.0 (est.)
12 November 4, 1952 Russia Kamchatka, Russian SFSR, Soviet Union 1952 Severo-Kurilsk earthquake 9.0
 
 

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