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Analysis of tsunami earthquakes such as the 1946 Aleutian Islands earthquake shows that the release of seismic moment takes place at an unusually long period. Calculations of the effective moment derived from surface waves show a rapid increase with decrease in the frequency of the seismic waves, whereas for ordinary earthquakes it remains almost constant with frequency.
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.
Historical earthquakes is a list of significant earthquakes known to have occurred prior to the early 20th century. As the events listed here occurred before routine instrumental recordings — later followed by discoveries of Earth's tectonic plates, [1] seismotomography imaging technique, [2] observations using space satellites from outer space, [3] artificial intelligence (AI)-based ...
While it has generated large tsunamigenic earthquakes in the past such as that in 1899 and 1629, the fault is situated too far from Ambon to have caused huge tsunami run-ups. [ 1 ] Since the tsunami from the earthquake had an extreme run-up height of at least 100 metres (330 ft) observed locally on the northern shore of Ambon, researchers have ...
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 ...
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 ...
The tsunami crossed the Pacific Ocean and damaged the harbor at Crescent City, California. Post-tsunami surveys indicate that the local tsunami in the central Kuril Islands reached runups of 21.9 metres (72 ft) or higher. [4] [5] This earthquake is also considered a doublet of the 2007 Kuril Islands earthquake that hit the same area on January ...
The tsunami washed away a further 15,000 houses and a total of 3,000 people died from either the earthquake or the tsunami. [6] The death toll associated with the tsunami was less than would be expected in comparison to the 1707 tsunami , because many people had left the coastal area following the large earthquake the previous day. [ 7 ]