Earthquake

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Damage from the San Francisco, California earthquake in 1906.
San Francisco Bay earthquake prediction.
A replica of Zhang Heng's (78–139 AD) seismometer. It employed a pendulum sensitive to ground tremors; placed in Luoyang in 133, it detected an earthquake 400 to 500 km (250 to 310 mi) away in Gansu

An earthquake (also known as a quake, or tremor) is a violent movement of the rocks in the Earth's crust. Earthquakes are usually quite brief, but may repeat over a long period of time. They are the result of a sudden release of energy in the Earth's crust. This creates seismic waves, waves of energy that travel through the Earth.

There are large earthquakes and small earthquakes. Big earthquakes can take down buildings and cause death and injury. The study of earthquakes is called seismology.[1] Seismology studies the frequency, type and size of earthquakes over a period of time.

When the earth moves offshore in the ocean, it can cause a tsunami. This can cause just as much death and destruction as an earthquake. Landslides can happen, too. This is an important part of the Earth's rock cycle.

Earthquakes are measured using observations from seismometers. The magnitude of an earthquake, and the intensity of shaking, is usually reported on the Richter scale. On the scale, 3 or less is scarcely noticeable, and magnitude 7 (or more) causes damage over a wide area.

History[change | edit source]

The ancient Chinese used a device that looked like a jar with dragons on the top surrounded by frogs with their mouths open. When an earthquake occurred, a ball fitted into each dragon's mouth would drop out of the dragon's mouth into the frog's. The position of the frog which received a ball indicated the direction of the earthquake.

Causes of earthquakes[change | edit source]

Fault types

Earthquakes are caused by tectonic movements in the Earth's crust. The main cause is that when tectonic plates collide, one rides over the other, causing orogeny (mountain building), earthquakes and volcanoes.

The boundaries between moving plates form the largest fault surfaces on Earth. When they stick, relative motion between the plates leads to increasing stress. This continues until the stress rises and breaks, suddenly allowing sliding over the locked portion of the fault, releasing the stored energy.

Earthquake fault types[change | edit source]

There are three main types of fault that may cause an earthquake: normal, reverse (thrust) and strike-slip. Normal faults occur mainly in areas where the crust is being extended. Reverse faults occur in areas where the crust is being shortened. Strike-slip faults are steep structures where the two sides of the fault slip horizontally past each other.

Earthquake clusters[change | edit source]

Most earthquakes form part of a sequence, related to each other in terms of location and time.[2] Most earthquake clusters consist of small tremors which cause little to no damage, but there is a theory that earthquakes can recur in a regular pattern.[3]

Foreshocks[change | edit source]

A foreshock is an earthquake that occurs before a larger earthquake, the mainshock. A foreshock is in the same area of the main shock but always of a smaller magnitude.[4]

Aftershocks[change | edit source]

An aftershock is an earthquake that occurs after a previous earthquake, the mainshock. An aftershock is in the same region of the main shock but always of a smaller magnitude. Aftershocks are formed as the crust adjusts to the effects of the main shock.[2]

Earthquake swarms[change | edit source]

Earthquake swarms are sequences of earthquakes striking in a specific area within a short period of time. They are different from earthquakes followed by a series of aftershocks by the fact that no single earthquake in the sequence is obviously the main shock, therefore none have notable higher magnitudes than the other. An example of an earthquake swarm is the 2004 activity at Yellowstone National Park.[5]

Earthquake storms[change | edit source]

Sometimes a series of earthquakes occur in a sort of earthquake storm, where the earthquakes strike a fault in clusters, each triggered by the shaking or stress redistribution of the previous earthquakes. Similar to aftershocks but on adjacent segments of fault, these storms occur over the course of years, and with some of the later earthquakes as damaging as the early ones. Such a pattern occurred in the North Anatolian fault in Turkey in the 20th century.[6][7]

Tsunami[change | edit source]

Animation of the 2011 Sendai tsunami.

Tsunami or a chain of fast moving waves in the ocean caused by powerful earthquakes is a very serious challenge for people's safety and for earthquake engineering. Those waves can inundate coastal areas, destroy houses and even swipe away whole towns.[8]

Unfortunately, tsunamis can not be prevented. However, there are warning systems[9] which may warn the population before the big waves reach the land to let them enough time to rush to safety.

Earthquake-proofing[change | edit source]

Some places, such as Japan or California, have many earthquakes and many inhabitants. There, it is good practice to construct houses and other buildings which will resist collapse in an earthquake. This is called seismic design or "earthquake-proofing".

The Haitian National Palace after at the 2010 Haiti earthquake.

Earthquake-proof buildings are constructed to withstand the destructive force of an earthquake. This depends upon its type of construction, shape, mass distribution, and rigidity. Different combinations are used. Square, rectangular, and shell-shaped buildings can withstand earthquakes better than skyscrapers. To reduce stress, a building's ground floor can be supported by extremely rigid, hollow columns, while the rest of the building is supported by flexible columns inside the hollow columns. Another method is to use rollers or rubber pads to separate the base columns from the ground, allowing the columns to shake parallel to each other during an earthquake.

To help prevent a roof from collapsing, builders make the roof out of light-weight materials. Outdoor walls are made with stronger and more reinforced materials such as steel or reinforced concrete. During an earthquake flexible windows may help hold the windows together so they don’t break.

Notes[change | edit source]

  1. Earth Science. Austin, Texas 78746-6487: Holt, Rinehart Winston. 2001. ISBN 0-03-055667-8.
  2. 2.0 2.1 "What are aftershocks, foreshocks, and earthquake clusters?". http://earthquake.usgs.gov/eqcenter/step/explain.php.
  3. "Repeating earthquakes". United States Geological Survey. January 29, 2009. http://earthquake.usgs.gov/research/parkfield/repeat.php. Retrieved May 11, 2009.
  4. Gates, A.; Ritchie, D. (2006). Encyclopedia of Earthquakes and Volcanoes. Infobase Publishing. p. 89. ISBN 978-0-8160-6302-4. http://books.google.co.uk/books?id=b1sXfJCiCHQC&pg=PA89.
  5. "Earthquake swarms at Yellowstone". USGS. http://volcanoes.usgs.gov/yvo/2004/Apr04Swarm.html. Retrieved 2008-09-15.
  6. Amos Nur (2000). "Poseidon’s horses: plate tectonics and earthquake storms in the late [Bronze Age Aegean and Eastern Mediterranean"]. Journal of Archaeological Science 27: 43–63. doi:10.1006/jasc.1999.0431. ISSN 0305-4403. http://water.stanford.edu/nur/EndBronzeage.pdf.
  7. "Earthquake storms". Horizon (BBCtv series). 9pm 1 April 2003. http://www.bbc.co.uk/science/horizon/2003/earthquakestorms.shtml. Retrieved 2007-05-02.
  8. USGS Poster of the Near the East Coast of Honshu, Japan Earthquake of 11 March 2011 - Magnitude 8.9
  9. Pacific Tsunamy Warning Center

Related pages[change | edit source]

Other websites[change | edit source]