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An earthquake is the shaking of the surface of Earth resulting from a sudden release of energy in the lithosphere that creates seismic waves. Earthquakes may also be referred to as quakes, tremors, or temblors. The word tremor is also used for non-earthquake seismic rumbling . In its most general sense, an earthquake is any seismic event ...
In seismology, a tsunami earthquake is an earthquake which triggers a tsunami of significantly greater magnitude, as measured by shorter-period seismic waves. The term was introduced by Japanese seismologist Hiroo Kanamori in 1972. [ 1] Such events are a result of relatively slow rupture velocities. They are particularly dangerous as a large ...
Casualties. 227,898 dead [ 5][ 6] On 26 December 2004, at 07:58:53 local time ( UTC+7 ), a major earthquake with a magnitude of 9.2–9.3 Mw struck with an epicentre off the west coast of northern Sumatra, Indonesia. The undersea megathrust earthquake, known by the scientific community as the Sumatra–Andaman earthquake, [ 8][ 9] was caused by ...
A sufficiently large earthquake magnitude and other information triggers a tsunami warning. While the subduction zones around the Pacific are seismically active, not all earthquakes generate a tsunami. Computers assist in analysing the tsunami risk of every earthquake that occurs in the Pacific Ocean and the adjoining land masses.
The 1946 Aleutian Islands earthquake occurred near the Aleutian Islands, Alaska on April 1, 1946. The shock measured ( Mw) 8.6, Mt 9.3 or ( Ms) 7.4. It had a maximum Mercalli intensity of VI ( Strong ). [ 3][ 4] It resulted in 165–173 casualties and over US $26 million in damage. The seafloor along the fault was elevated, triggering a Pacific ...
Scientists recorded a slow-slip event in 2011 before the magnitude-9 Tohoku earthquake and tsunami in Japan, which killed more than 18,000 people and touched off the Fukushima nuclear disaster.
The first earthquake, which struck offshore Poverty Bay on 26 March 1947 at 8:32 am NZST, seemed like a minor earthquake in Gisborne, [2] but was 7.0–7.1 M w. [3] It generated a tsunami with a maximum measured run-up height of 10 metres that struck the coast from Māhia Peninsula to Tokomaru Bay , [ 3 ] swamping the coast between Muriwai and ...
684 Hakuhō earthquake, Nankai earthquake. Earthquake. The first recorded tsunami in Japan struck on 29 November 684 AD off the coast of the Kii, Shikoku, and Awaji region. The earthquake, estimated at a magnitude of 8.4, [ 40] was followed by a large tsunami, but there are no estimates of the number of deaths. [ 56]