Portal:Earthquakes

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Introduction

Earthquake epicenters occur mostly along tectonic plate boundaries, and especially on the Pacific Ring of Fire.

An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth, resulting from the sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in size from those that are so weak that they cannot be felt to those violent enough to toss people around and destroy whole cities. The seismicity, or seismic activity, of an area is the frequency, type and size of earthquakes experienced over a period of time. The word tremor is also used for non-earthquake seismic rumbling.

At the Earth's surface, earthquakes manifest themselves by shaking and displacing or disrupting the ground. When the epicenter of a large earthquake is located offshore, the seabed may be displaced sufficiently to cause a tsunami. Earthquakes can also trigger landslides, and occasionally volcanic activity.

Selected article

Tsunami strikes, Ao Nang, Thailand.
The 2004 Indian Ocean earthquake was an undersea (subduction) earthquake that occurred at 00:58:53 UTC on December 26, 2004, with an epicentre off the west coast of Sumatra, Indonesia. The earthquake triggered a series of devastating tsunamis along the coasts of most landmasses bordering the Indian Ocean, killing more than 225,000 people in eleven countries, and inundating coastal communities with waves up to 30 meters (100 ft) high. It was one of the deadliest natural disasters in history. Indonesia, Sri Lanka, India, and Thailand were hardest hit.

With a magnitude of between 9.1 and 9.3, it is the second largest earthquake ever recorded on a seismograph. This earthquake had the longest duration of faulting ever observed, between 8.3 and 10 minutes. It caused the entire planet to vibrate as much as 1 cm (0.5 inches)[1] and triggered other earthquakes as far away as Alaska.[2] The disaster is known by the scientific community as the Great Sumatra-Andaman earthquake,[3] and is also known as the Asian Tsunami and the Boxing Day Tsunami.



Did you know...

  • ...that the 1946 Nankaido earthquake caused a 5-6 meter (16-20 feet) tsunami that took out another 2,100 homes after the initial destruction of the earthquake?
  • ...that the 2003 Hokkaido earthquake was not given a cost in US dollars because it occurred offshore and did not cause as much damage as it would have on the mainland of Japan?

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WikiProject Earthquakes is the central point of coordination for Wikipedia's coverage of earthquakes, seismology, tsunamis, and related subjects. Please feel free to join and help!

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  1. ^ Walton, Marsha. "Scientists: Sumatra quake longest ever recorded." CNN. May 20, 2005
  2. ^ West, Michael; Sanches, John J.; McNutt, Stephen R. "Periodically Triggered Seismicity at Mount Wrangell, Alaska, After the Sumatra Earthquake." Science. Vol. 308, No. 5725, 1144–1146. May 20, 2005.
  3. ^ Lay, T., Kanamori, H., Ammon, C., Nettles, M., Ward, S., Aster, R., Beck, S., Bilek, S., Brudzinski, M., Butler, R., DeShon, H., Ekström, G., Satake, K., Sipkin, S., The Great Sumatra-Andaman Earthquake of December 26, 2004, Science, 308, 1127–1133, doi:10.1126/science.1112250, 2005