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A submarine, undersea, or underwater earthquake is an earthquake that occurs underwater at the bottom of a body of water, especially an ocean. They are the leading cause of tsunamis. The magnitude can be measured scientifically by the use of the moment magnitude scale and the intensity can be assigned using the Mercalli intensity scale.
Oceanic trenches are prominent, long, narrow topographic depressions of the ocean floor. They are typically 50 to 100 kilometers (30 to 60 mi) wide and 3 to 4 km (1.9 to 2.5 mi) below the level of the surrounding oceanic floor, but can be thousands of kilometers in length.
Megathrust earthquakes occur at convergent plate boundaries, where one tectonic plate is forced underneath another. The earthquakes are caused by slip along the thrust fault that forms the contact between the two plates. These interplate earthquakes are the planet's most powerful, with moment magnitudes (M w) that can exceed 9.0.
Multiple notable earthquakes have struck the United States this year, including a powerful quake in California and a historic event on the East Coast earlier in 2024.. Strong earthquakes can lead ...
A major earthquake measuring 7.4 hit Taiwan early Wednesday, killing 9 and injuring at least 1,000. A 7.4 earthquake is exponentially more destructive than the 4.8 quake that struck central New ...
Global multihazard mortality risks and distribution (2005) for cyclones, drought, earthquakes, floods, landslides, and volcanoes (excluding heat waves, snowstorms, and other deadly hazards). A natural disaster is a sudden event that causes widespread destruction, major collateral damage, or loss of life, brought about by forces other than the ...
Many researchers have chased clues of the last “big one”: an 8.7-magnitude earthquake in 1700. ... could cause shaking that lasts about five minutes and generate tsunami waves up to 80 feet ...
Initial earthquake and aftershocks measuring greater than 4.0 M w from 26 December 2004 to 10 January 2005 Aftershocks of 2004 Indian Ocean earthquake Numerous aftershocks were reported off the Andaman Islands , the Nicobar Islands and the region of the original epicentre in the hours and days that followed.