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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.
Lisbon earthquake and tsunami in November 1755. While Japan may have the longest recorded history of tsunamis, [23] [better source needed] the sheer destruction caused by the 2004 Indian Ocean earthquake and tsunami event mark it as the most devastating of its kind in modern times, killing around 230,000 people. [24]
The earthquake and tsunami combined killed 28 people, injured 287, and left five missing. Property damage included 815 houses completely destroyed, 1,324 half-damaged, and 6,395 partially damaged, with 20 lost to fire and 1,621 rendered uninhabitable. The tsunami swept away 91 houses, flooded 328 others, and damaged 451 ships and boats.
Earthquake and tsunami modelers are beginning to assess how the new data affects earthquake scenarios for the Pacific Northwest. Kelin Wang, a research scientist at the Geological Survey of Canada ...
A view of Pacific Coastline in Pacifica, California, United States on December 5, 2024 as tsunami warning issued after 7.0 magnitude earthquake reported off Northern California coast.
Earthquakes result in various effects, such as ground shaking and soil liquefaction, leading to significant damage and loss of life. When the epicenter of a large earthquake is located offshore, the seabed may be displaced sufficiently to cause a tsunami. Earthquakes can trigger landslides.
Japan is an extremely quake-prone nation, but a tsunami warning of the magnitude of Monday's had not been issued since a major quake and tsunami caused meltdowns at a nuclear plant in March 2011.
A seismogram recorded in Massachusetts, United States. The magnitude 9.1 (M w) undersea megathrust earthquake occurred on 11 March 2011 at 14:46 JST (05:46 UTC) in the north-western Pacific Ocean at a relatively shallow depth of 32 km (20 mi), [9] [56] with its epicenter approximately 72 km (45 mi) east of the Oshika Peninsula of Tōhoku, Japan, lasting approximately six minutes.