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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.
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 ...
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.
The 1605 Keichō earthquake (Japanese: 慶長地震) occurred at about 20:00 local time on 3 February.It had an estimated magnitude of 7.9 on the surface-wave magnitude scale and triggered a devastating tsunami that resulted in thousands of deaths in the Nankai and Tōkai regions of Japan.
The earthquake was assigned a moment magnitude (M w ) of 8.5–8.6 and caused a destructive tsunami of 1.5 m (4 ft 11 in) at the Kai islands. [ 1 ] [ 4 ] The tsunami expected for an earthquake of this size is much greater, such as of those in 1629 and 1852, however this earthquake occurred at a depth of 60 km which impeded much of the ocean ...
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 Yaeyama Great Earthquake The 1771 Great Yaeyama Tsunami (also called 明和の大津波, the Great Tsunami of Meiwa) was caused by the Yaeyama Great Earthquake at about 8 A.M. on April 24, 1771, south-southeast of Ishigaki Island , part of the former Ryūkyū Kingdom and now part of present-day Okinawa , Japan.
The Aleutian Trench, of the southern coast of Alaska and the Aleutian Islands, where the North American plate overrides the Pacific plate, has generated many major earthquakes throughout history, several of which generated Pacific-wide tsunamis, [22] including the 1964 Alaska earthquake; at magnitude 9.1–9.2, it remains the largest recorded ...