An Italian scientist team announced the discovery of Wembo-Nyama crater, a gigantic impact crater in Congo. The new crater, which measures between 36 and 46 kilometres in diameter, is claimed by some scientists to be one of the largest craters discovered in the past ten years or so.
Italian researchers who have had a chance to look at the feature proposed a number of causes for its creation, but eventually they themselves came to the conclusions that nothing but a space impact – most likely an asteroid or a comet – could have formed this hole.
The Unia River flows around the ring structure, underlining its round shape.
Some of the largest craters are:
– Vredefort: S Africa, 300km-wide, 2 billion years old
– Sudbury: Canada, 250km-wide, 1.8 billion years old
–Chicxulub: Mexico, 170km-wide, 65 million years old (buried under Mexico’s Yucatan Peninsula)
– Popigai: Russia, 100km-wide, 35.7 million years old
– Manicouagan: Canada, 100km-wide, 214 million years old
Sources:
caused devastating tsunamis along the Indian Ocean, including Indonesia, Sri Lanka, India, and Thailand. Its magnitude was between 9.1 and 9.3. It is one of the deadliest natural disasters in recorded history, killing nearly 230,000 people.
Kamchatka earthquakes: 
The 1868 Arica Earthquake occurred near Arica, which was part of Peru at the time. The earthquake caused tsunamis in the Pacific Ocean, causing damage to Peru, Hawaii, and New Zealand’s Charham Islands. Arica, Tacna, Ilo, Torata, Mollendo, Iquique, and Arequipa were almost completely destructed, with an estimated 25,000 casualties. The earthquake has an estimGgated magnitude range from 8.5 to 9.0, with about 400 aftershocks recorded.
coast of Japan, and is possibly linked to the Bonneville slide. Evidence of this earthquake includes records of the Japanese tsunami not tied to any other Pacific Rim earthquake, and studies of tree rings that show red cedar trees with outermost growth rings formed in 1699. The Cascadia earthquake is believed to have a magnitude of 9.
The 1833 Sumatra earthquake had an estimated magnitude between 8.8 and 9.2, estimated using uplift from coral microatolls. This earthquake caused a large tsunami on the island of Sumatra between Pariaman to Bengkulu, and possibly damage in the Seychelles. Although there are no records of loss of life, they are described as “numerous.”
felt in much of Chile and South America, including the cities of Talcahuano, Lota, San Antonio, Arauco, Chiguayente, Cañete, and Buenos Aires. Tsunami warnings were issued in 53 countries, and a tsunami was recorded in the sea at Valparaiso, Chile. As of February 28, 2010, 723 deaths were confirmed, with many more reported missing. This earthquake was so powerful, it is estimated that it shortened day lengths by 1.26 microseconds, and altered Earth’s axis rotation by 3 inches.
Colombia. It generated a strong tsunami that killed between 500 and 1500 people in Hawaii, arriving in Hilo and Honolulu, and Kahului.
measured 8.7 magnitude. It caused cracks in wood buildings and runways. There was a tsunami 10.7 meters high on Shemya Island. There was a loss of an estimated $10,000 on Amchitka Island, and at least one recorded aftershock.
