What was the earthquake duration for 26 December 2004 tsunami?
The earthquake was the third-largest ever recorded, the largest in the 21st century and had the longest duration of faulting ever observed, between eight and ten minutes.
Can a 3.5 magnitude earthquake cause a tsunami?
It should be noted that not all earthquakes generate tsunamis. Usually, it takes an earthquake with a Richter magnitude exceeding 7.5 to produce a destructive tsunami. Most tsunamis are generated by shallow, great earthquakes at subductions zones.
What are the magnitudes of tsunamis?
Generally, an earthquake must exceed magnitude 8.0 to generate a dangerous distant tsunami. The amount of movement of the ocean floor, the size of the area over which an earthquake occurs, and the depth of the water above the earthquake are also important factors in the size of a resulting tsunami.
What is the velocity of a tsunami?
Wave velocity is the speed of the wave. Velocities of normal ocean waves are about 90 km/hr while tsunami have velocities up to 950 km/hr (about as fast as jet airplanes), and thus move much more rapidly across ocean basins.
What happened in the Indian Ocean on December 26 2004?
A powerful undersea earthquake that struck off the coast of Sumatra island, Indonesia, set off the 2004 Indian Ocean tsunami, also known as the Christmas or Boxing Day tsunami, on Sunday morning, Dec. 26, 2004.
Can you swim in a tsunami?
“A person will be just swept up in it and carried along as debris; there’s no swimming out of a tsunami,” Garrison-Laney says. “There’s so much debris in the water that you’ll probably get crushed.” A tsunami is actually a series of waves, and the first one might not be the largest.
Is a 7.5 earthquake bad?
Intensity 7: Very strong — Damage negligible in buildings of good design and construction; slight to moderate in well-built ordinary structures; considerable damage in poorly built or badly designed structures; some chimneys broken. Intensity 6: Strong — Felt by all, many frightened.
Is a 4.7 earthquake bad?
Danger level 4 (high danger) Damage is highly likely to be caused by falling objects in buildings. The earthquake is felt strongly, people are alarmed and lose balance. These effects correspond to an intensity of VII*. This level of intensity may be reached with earthquakes with a magnitude of around 4.7 or greater.
What’s the biggest tsunami?
1958 Lituya Bay earthquake and megatsunami
Tsunami/Biggest
Lituya Bay, Alaska, July 9, 1958 Its over 1,700-foot wave was the largest ever recorded for a tsunami. It inundated five square miles of land and cleared hundreds of thousands of trees. Remarkably, only two fatalities occurred.
What earthquakes cause tsunamis?
The earthquake must be a shallow marine event that displaces the seafloor. Thrust earthquakes (as opposed to strike slip) are far more likely to generate tsunamis, but small tsunamis have occurred in a few cases from large (i.e., > M8) strike-slip earthquakes.
How fast was the fastest tsunami?
Last September, an earthquake triggered a deadly tsunami in Indonesia. Scientists now have clocked the speed of rupture at a blistering 9,600 miles per hour.
What is the farthest a tsunami has Travelled?
Tsunami waves can be very long (as much as 60 miles, or 100 kilometers) and be as far as one hour apart. The Indian Ocean tsunami traveled as much as 3,000 miles (nearly 5,000 kilometers) to Africa, arriving with sufficient force to kill people and destroy property.
Are there any other earthquakes with a tsunami?
Other tsunami earthquakes 1 1605 Nankai earthquake 2 1677 Bōsō earthquake 3 1907 Sumatra earthquake 4 April 1923 Kamchatka earthquake and tsunami 5 1932 Jalisco earthquakes 6 1946 Aleutian Islands earthquake 7 November 1960 Peru earthquake 8 1963 Kuril Islands earthquake 9 1975 Kuril Islands earthquake 10 1994 Java earthquake
Why are tsunamis so dangerous to the coastline?
They are particularly dangerous as a large tsunami may arrive at a coastline with little or no warning. The distinguishing feature for a tsunami earthquake is that the release of seismic energy occurs at long periods (low frequencies) relative to typical tsunamigenic earthquakes.
Which is a distinguishing feature of a tsunami earthquake?
The distinguishing feature for a tsunami earthquake is that the release of seismic energy occurs at long periods (low frequencies) relative to typical tsunamigenic earthquakes.
How big was the tsunami in Japan in 1896?
On 15 June 1896 the Sanriku coast was struck by a devastating tsunami with a maximum wave height of 38.2 m, which caused more than 22,000 deaths. The residents of the coastal towns and villages were taken completely by surprise because the tsunami had only been preceded by a relatively weak shock.