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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 ...
Severe shaking from this earthquake was recorded from the Bōsō Peninsula in the northeast to the Kii Peninsula in the southwest. A tsunami was recorded in Suruga Bay and at Kamakura, where it destroyed the building housing the statue of the Great Buddha at Kōtoku-in, [9] although the statue itself survived and has remained outdoors ever since.
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 1611 Sanriku earthquake (慶長三陸地震, Keichō Sanriku Jishin) occurred on December 2, 1611, with an epicenter off the Sanriku coast in Iwate Prefecture, Japan. The magnitude of the earthquake was 8.1 M s. [1] [3] It triggered a devastating tsunami. A description of this event in an official diary from 1612 is probably the first ...
It was calculated by using tsunami run up from Honolulu, Hilo, and the average of stations in California. Even excluding the values given by Hilo (the highest M t ), the tsunami magnitude is at least 9.1. [4] The earthquake was originally thought to be a strike-slip earthquake, and later a strike slip earthquake with a normal faulting component.
Tsunamis affecting New Zealand are mainly due to the country being part of the geologically active Pacific plate and associated with the Pacific Ring of Fire. Tsunamis affect New Zealand's coastline reasonably frequently and tend to be caused by earthquakes on the Pacific plate both locally and as far away as South America, Japan, and Alaska.
The 2006 Kuril Islands earthquake occurred on November 15 at 8:14:16 pm JST with a M w magnitude of 8.3 and a maximum Mercalli intensity of IV (Light) and a maximum Shindo intensity of JMA 2. This megathrust earthquake was the largest event in the central Kuril Islands since 1915 and generated a small tsunami that affected the northern Japanese ...
The subduction zone is associated with at least two known ~9.0 M w earthquakes in the pre-instrumental period; 1737 and 1841. [6] The 1737 earthquake measured M w 9.0–9.3, and generated the largest known tsunami (60 meters) on the peninsula. [7] Another M w 9.0 earthquake struck the peninsula on May 17, 1841. It generated a tsunami up to 15 ...