When a tsunami travels from deep water to shallow water, the speed of the wave crest or trough slows, the wavelength decreases, and the amplitude increases. Crustal stresses caused by earthquakes on the inter-plate thrust fault in subduction zones can also be transferred to the outer rise, triggering earthquakes on At the Tonga trench, the Pacific plate entering the subduction zone is particularly old and dense, resulting in a steep angle of descent and many normal faults near the trench. In 2009, about 950 people lived on Niuatoputapu. Moreover, tsunami generation occurred in much deeper water than normal. It resulted in many deaths and left tousands of people homeless. Since the 2009 tsunami, Samoa has taken many preparedness measures: Established a 24/7 National Earthquake and Tsunami Warning Center and built an Emergency Operations Center to support disasters Upgraded its warning dissemination systems to include island-wide sirens and SMS to essential village and national representatives, churches, schools, NGOs, and the private sectorCreated community-driven evacuation maps and signage. An earthquake happened, which triggered the tsunami.
In this region, the Pacific plate subducts westward beneath the Australia plate at the Tonga Trench.
The 2009 tsunami devastated the South Pacific islands of Tonga and Samoa On an idyllic Monday night in 2009, the palm-lined coasts of the American Samoa, Samoa, and Tonga Islands looked peaceful and serene. On the morning of September 29, 2009, a large undersea earthquake near Samoa generated a destructive tsunami that killed more than 100 people, said news reports. And the tsunami struck exactly when Samoa was already facing the full force of the global economic crisis. Wiki User. Samoa is returning to normal, rebuilding its infrastructure and clearing up the debris left by the tsunami. "Gibson says residents of the nearby islands would have felt the earthquake last for at least a minute, which is a sure sign of an impending tsunami.
However, the initial Tonga earthquake occurred up to 100 km (62 miles) from the closest tectonic plate boundary. Talks have begun on how to keep the Samoan public better informed of pending disasters. In the hopes that disasters such as this can be minimized in the future, we attempt to understand the mechanism and impact of this tsunami. It's nature giving you a warning," he says.Gibson estimates that the tsunami would have taken 20 minutes to reach the islands of Samoa and American Samoa.Reports from American Samoa say waves of up to three metres washed onto the island, causing widespread destruction.
Celui-ci a été suivi d'un tsunami qui a déjà fait plus d'une centaine de morts. A map showing the effects of an 8.3-magnitude earthquake and its resultant tsunami on Samoa and American Samoa.Scientists say the tsunami that devastated the islands of Samoa, American Samoa and Tonga was the result of a shallow rupture in the earth's crust.The earthquake, which was measured as high as 8.3 on the Richter scale, occurred 190 kilometres southwest of American Samoa. In the 2009 tsunami an estimated 5274 people lost their homes to the waves. It resulted in many deaths and left tousands of people homeless. "From research we know we can expect that if an earthquake is larger than magnitude 6.5 there may be a tsunami, but this is not directly or linearly related to size.
But by early Tuesday morning, residents and tourists were struck a devastating blow when a massive earthquake hit 120 miles off the coast of the islands, triggering a tsunami that killed hundreds.
As it bent, it snapped near its middle sending out shockwaves.Earthquakes and tsunamis are a common feature of the Pacific.
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