1. U.S. Geological Survey Earthquake Hazards Program USGS Earthquake Hazards Program, responsible for monitoring, reporting, and researching earthquakes and earthquake hazards http://earthquake.usgs.gov/

2. Earthquakes earthquakes. An earthquake is when the surface of the earth is shaking because of rapid movement of the rocky outer layer of the earth. If energy that is stored inside the http://library.thinkquest.org/03oct/01027/earthquakes.html

Earthquakes An earthquake is when the surface of the earth is shaking because of rapid movement of the rocky outer layer of the earth. If energy that is stored inside the earth (strain in rocks is the usual form) is released suddenly, an earthquake occurs. When this happens, earthquake waves transfer the released energy to the surface of the earth. Seismology is the study of earthquakes, and the waves that they create. The focus (sometimes referred to as the hypocenter) is the point within a geological fault that is rupturing where the earthquake begins. The epicenter is the point on the surface of the earth that is directly above the focus. When the energy is released, the earthquake waves start at the focus, and then radiate out from there along the part of the fault that has ruptured. Shallow-focus earthquakes are created if the focus is near the surface of the earth (between zero and forty miles deep) while deep-focus earthquakes are created if the focus is deep within the earth (between forty and four hundred miles deep). Shallow-focus earthquakes are much more common than deep-focus ones, and they are usually larger, which in turn makes them more dangerous. Shallow-focus earthquakes usually begin near an area where the crustal plates of the earth are moving against one another. Deep-focus earthquakes usually begin in places where one tectonic plate moves under another one, or subducts.

3. Magnitude 7.0 - HAITI REGION Provides maps, a summary and detailed information on the magnitude 7.0 earthquake that struck Haiti on January 12, 2010. http://earthquake.usgs.gov/earthquakes/eqinthenews/2010/us2010rja6/

USGS Home Contact USGS Search USGS Earthquake Hazards Program ... Research Magnitude 7.0 - HAITI REGION 2010 January 12 21:53:10 UTC Details Summary Maps Tsunami ... Additional Info Earthquake Details This event has been reviewed by a seismologist. Magnitude Date-Time Tuesday, January 12, 2010 at 21:53:10 UTC Tuesday, January 12, 2010 at 04:53:10 PM at epicenter Time of Earthquake in other Time Zones Location Depth 13 km (8.1 miles) set by location program Region HAITI REGION Distances 25 km (15 miles) WSW of PORT-AU-PRINCE, Haiti 130 km (80 miles) E of Les Cayes, Haiti 150 km (95 miles) S of Cap-Haitien, Haiti 1125 km (700 miles) SE of Miami, Florida Location Uncertainty horizontal +/- 3.4 km (2.1 miles); depth fixed by location program Parameters M-type=teleseismic moment magnitude (Mw), Version=9 Source USGS NEIC (WDCS-D) Event ID Did you feel it? Report shaking and damage at your location. You can also view a map displaying accumulated data from your report and others. Earthquake Summary Earthquake Summary Poster 2/23/10-USGS Updates Assessment of Earthquake Hazard and Safety in Haiti and the Caribbean Felt Reports Tectonic Summary The January 12, 2010, Haiti earthquake occurred in the boundary region separating the Caribbean plate and the North America plate. This plate boundary is dominated by left-lateral strike slip motion and compression, and accommodates about 20 mm/y slip, with the Caribbean plate moving eastward with respect to the North America plate.

4. Earthquake - Wikipedia, The Free Encyclopedia earthquakes occurring at a depth of less than 70 km are classified as 'shallowfocus' earthquakes, while those with a focal-depth between 70 and 300 km are commonly termed 'mid http://en.wikipedia.org/wiki/Earthquake

Earthquake From Wikipedia, the free encyclopedia Jump to: navigation search For other uses, see Earthquake (disambiguation) Global earthquake epicenters Global plate tectonic movement An earthquake (also known as a quake tremor or temblor ) is the result of a sudden release of energy in the Earth's crust that creates seismic waves . The seismicity or seismic activity of an area refers to the frequency, type and size of earthquakes experienced over a period of time. Earthquakes are measured with a seismometer ; a device which also records is known as a seismograph. The moment magnitude (or the related and mostly obsolete Richter magnitude) of an earthquake is conventionally reported, with magnitude 3 or lower earthquakes being mostly imperceptible and magnitude 7 causing serious damage over large areas. Intensity of shaking is measured on the modified Mercalli scale At the Earth's surface, earthquakes manifest themselves by shaking and sometimes displacing the ground. When a large earthquake epicenter is located offshore, the seabed sometimes suffers sufficient displacement to cause a tsunami . The shaking in earthquakes can also trigger landslides and occasionally volcanic activity. In its most generic sense, the word

5. Earthquake - Simple English Wikipedia, The Free Encyclopedia An earthquake 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. http://simple.wikipedia.org/wiki/Earthquake

Earthquake From Wikipedia, the free encyclopedia Jump to: navigation search 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 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. 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. When the earth moves in an earthquake, it can cause waves in the ocean , and if a wave grows large enough, it's called a " tsunami ". A tsunami can do just as much death and destruction as an earthquake. Landslides can happen, too. This is a very important part of the earth's cycle. Earthquakes are measured with a seismometer . The magnitude of an earthquake, and the intensity of shaking, is measured on a numerical scale. On the scale, 3 or less is scarcely noticeable, and magnitude 7 (or more) causes damage over a wide area. The ancient Chinese also 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.

6. Earthquakes USGS Earthquake Hazards Program, responsible for monitoring, reporting, and researching earthquakes and earthquake hazards http://earthquake.usgs.gov/earthquakes/

7. Savage Earth: Restless Planet wNetStation, the Web site of Thirteen/WNET, presents SAVAGE EARTH ONLINE, the Web companion to the fourhour series on earthquakes, volcanoes, tsunamis, and other natural disasters http://www.pbs.org/wnet/savageearth/earthquakes/index.html

document.write(unescape("%3Cscript src='" + (document.location.protocol == "https:" ? "https://sb" : "http://b") + ".scorecardresearch.com/beacon.js' %3E%3C/script%3E")); Earth: All Stressed Out by Daniel Pendick To experience the drama of plate tectonics the jostling of the giant plates that carry continents and oceans try this experiment: Sit in a comfortable chair, hold your hand out, and watch your fingernails grow. That's about the average speed of a tectonic plate. But wait around long enough, and even the tortoise crawl of plate tectonics will have dramatic and deadly consequences. Though plate tectonics is a global phenomenon and virtually invisible to us in our daily lives, it introduces enormous stresses in the crust where we live. From time to time, stressed-out crust releases the stress in sudden fits: earthquakes. More frequently than time to time, actually. If you imagine the Earth as a giant bell, it's ringing with earthquakes every second of the day from the many imperceptible clinks of microquakes to the deafening gong of very occasional but "great" earthquakes (those of magnitude 8.0 or greater). The U.S. Geological Survey estimates that several million temblors, most undetectable, happen every day. The great earthquake of 1906 devastated San Francisco, killing 700.

8. The Global Earthquake Response Center -- A WebMagic Site earthquakes occur when the lithospheric plates that compose the surface of the earth shift in relation to one another. earthquakes are happening constantly all over the world, but http://www.earthquakes.com/

A WebMagic site Register Now! (free) News Games ... QUAKE DATA Our secure online catalog features a comprehensive line of durable, high-quality products designed to fortify your home and office in preparation for an earthquake. Catalog is offline today. Check back soon. Please pick from the following web site categories: Survival Supplies Survival Kits Disasters Earthquake Safety ... Seismic Testing Earthquakes occur all over the world every day, so we've created a page where you can track the most recent seismic activity. Due to high traffic, this link is down for repair and upgrading. PREPAREDNESS DID YOU KNOW? Are you ready for the Big One? Our checklist can help you gather the supplies you'll need to survive a major quake. To the checklist Could a powerful enough earthquake cause California to break off and fall into the ocean? The answer FOR KIDS FEATURED EARTHQUAKE LINKS Looking for easy-to-understand information about earthquakes and seismology? We can help! We've created a guide to some of the best material available for students and teachers to help understand why quakes occur and what's being done to make our world safer. Continue Hector Mine (California) Earthquake, M7.1, Oct. 16, 1999:

9. National Weather Service - NWS Eureka earthquakes are not a meteorological phenomena, but the Eureka NWS will use its communication capabilities to disseminate information on earthquakes felt in http://www.wrh.noaa.gov/eka/misc/eqr.php

10. Earthquakes In Chile Illustrated article explaining why Chile is particularly prone to earthquakes. http://www.earlham.edu/~bieriir/earthquakes/

Physical Geology 2003 Earthquakes in Chile Destruction after the largest earthquake of the century in Valdivia on May 22, 1960 T ime line of Earthquakes in Chile Earthquakes in Chile The violent eruption of the volcano Puyehue, which erruped two days after the earthquake, about 200km from the epicenter SILLY GEOLOGY JOKES Why don't mountains tell jokes? Because they might crack up! What do you get when a cow is in an earthquake? A milkshake! What did the earthquake say to the other earthquake? It's all your fault! You know you drink too much coffee when a nervous twitch registers on the Richter scale and the only time you stand still is during an earthquake! jokes cortesy of: http://awards.schools.nsw.edu.au/entry66/facts.htm The dock area of Angelmo in the port city of Puerto Montt before and after the Earthquake The disasterous destruction of a tsunami in the town Queule , slightly north of Valdivia, the town was completely wiped out Tsunami destruction in the town of Ancud, which was hit with waves as high as 50 meters

11. Earthquakes In 2010 - Wikipedia, The Free Encyclopedia The California Geological Survey studies earthquakes to help Californians plan and build earthquake resistant communities. We record the strong ground motion from earthquakes http://en.wikipedia.org/wiki/Earthquakes_in_2010

Earthquakes in 2010 From Wikipedia, the free encyclopedia Jump to: navigation search This article's factual accuracy may be compromised because of out-of-date information . Please help improve the article by updating it. There may be additional information on the talk page (April 2010) This article needs additional citations for verification Please help improve this article by adding reliable references . Unsourced material may be challenged and removed (April 2010) Earthquakes in 2010 Earthquakes in 2010 (Earth) Approximate epicenters of the earthquakes in 2010 (7.0–7.9 in green, ≥ 8.0 in red) Strongest Earthquake Chile Earthquake M w Total fatalities 7.0 Magnitude+ 6.0–6.9 Magnitude 5.0–5.9 Magnitude Earthquakes Earthquakes in 2010 have resulted in nearly 250,000 fatalities. Primarily, the 2010 Haiti earthquake caused an estimated 230,000 deaths to that country, making it the 6th deadliest earthquake in recorded history . Also notable, the 2010 Chile earthquake registered a 8.8 on the moment magnitude scale , ranking it the fifth strongest earthquake since 1900. The tsunami associated with the Chile earthquake caused tsunami advisories and warning across the entire Ocean rim, also known as the

12. Earthquakes In Washington More than 1,000 earthquakes occur in the state annually. Washington has a record of at least 20 damaging earthquakes during the past 125 years. http://www.dnr.wa.gov/ResearchScience/Topics/GeologicHazardsMapping/Pages/earthq

var MSOWebPartPageFormName = 'aspnetForm'; Contact Us Media Center Jobs Site Map ... Topics Earthquakes in Washington Earthquakes in Washington More than 1,000 earthquakes occur in the state annually. Washington has a record of at least 20 damaging earthquakes during the past 125 years. Large earthquakes in 1946, 1949, and 1965 killed 15 people and caused more than $200 million (1984 dollars) in property damage. Most of these earthquakes were in western Washington, but several, including the largest historic earthquake in Washington (1872), occurred east of the Cascade crest. Earthquake histories spanning thousands of years from Japan, China, Turkey, and Iran show that large earthquakes recur there on the order of hundreds or thousands of years. Washington's short historical record (starting about 1833) is inadequate to sample its earthquake record. Using a branch of geology called paleoseismology to extend the historical record, geologists have found evidence of large, prehistoric earthquakes in areas where there have been no large historic events, suggesting that most of the state is at risk. GEOLOGIC SETTING Washington is situated at a convergent continental margin, the collisional boundary between two tectonic plates. The Cascadia subduction zone, which is the convergent boundary between the North America plate and the Juan de Fuca plate, lies offshore from northernmost California to southernmost British Columbia. The two plates are converging at a rate of about 3-4 centimeters per year (about 2 inches per year); in addition, the northward-moving Pacific plate is pushing the Juan de Fuca plate north, causing complex seismic strain to accumulate. Earthquakes are caused by the abrupt release of this slowly accumulated strain.

13. Earthquakes Canada West - New Web Site / Séismes Canada Ouest - Nouveau Site Web Provides information on current earthquakes for British Columbia and Western Canada, seismographs and seismic data, large historic earthquakes, earthquake hazard and other earthquakes and seismological related information. http://www.pgc.nrcan.gc.ca/seismo/

Earthquakes Canada - West The Earthquakes Canada - West Web site has been relocated. The page you attempted to view no longer exists. New Web site: Earthquakes Canada home page Earthquakes Canada: Site map Contact us Nouveau site Web : Plan du site Contactez-nous Please update your bookmarks and links. Veuillez, s.v.p., mettre vos signets et vos liens à jour.

14. Earthquakes Introduction An earthquake is a vibration of the Earth produced by a rapid release of energy (Tarbuck 378). The main features include the focus, the location within the http://www.umich.edu/~gs265/society/earthquakes.htm

Earthquakes and Society by Courtney Brunious and Amanda Warner Introduction An earthquake is a vibration of the Earth produced by a rapid release of energy (Tarbuck 378). The main features include the focus, the location within the Earth where the earthquake rupture starts, and the epicenter, the point on the Earth's surface directly above the focus. Earthquakes have a greater effect on society than most people think. These effects range from economical to structural to mental. An earthquake only occurs for a few brief moments; the aftershocks can continue for weeks; the damage can continue for years. Scientific Aspects Locating Earthquakes Seismographs record the ground shaking that results from the release of energy from earthquakes and help locate the epicenter and focus of an earthquake (Yeats 60). They have a mass freely suspended from a support that is attached to the ground. When the vibration from a distant earthquake reaches the instrument, the movement of Earth in relation to the stationary mass is recorded. The greater the interval between the arrival of the first primary wave and first secondary wave, the greater distance to the earthquake (Tarbuck 384). Modern seismology uses P wave's first motions and the amplitudes of direct P and S waves, surface waves and waves reflected many times from the surface of the earth to understand the earthquake source (Yeats 67). An earthquake may be initially located by comparing the differences in arrival times of various phases with standard time-tables and curves (Doyle 42). From there, earthquake depths are estimated by the arrival time of reflected waves from the surface above the focus. Earthquake depths vary and are generally categorized as shallow, with a focus within 70 km of the surface, intermediate, with a focus between 70 and 300 km of the surface, and deep, with a focus greater than 300 km below the surface. Ninety percent of all earthquakes occur at depths less than 100 km and almost all of the very damaging earthquakes appear to originate at shallow depths (Tarbuck 387). The majority of earthquakes are "shallow," within the upper cooler crust and in the most brittle part of the lithosphere (Doyle 44).

15. Earthquakes : Woods Hole Oceanographic Institution The surface of the Earth is in constant, if slow, motion which is good for the planet, if not for those of us living on it. http://www.whoi.edu/page.do?pid=12463

16. Earthquakes | Define Earthquakes At Dictionary.com –noun 1. a series of vibrations induced in the earth's crust by the abrupt rupture and rebound of rocks in which elastic strain has been slowly accumulating. 2. something http://dictionary.reference.com/browse/earthquakes

17. Earthquakes: Natural Or Man-Made? New Dawn explores new ideas and ancient beliefs, while encouraging greater awareness and critical thinking. Each issue examines the hidden dimension of culture, history and http://www.newdawnmagazine.com/Article/Earthquakes_Natural_or_Man_Made.html

Earthquakes: Natural or Man-Made? By Jason Jeffrey Precautions against unconventional arms must be intensified as potential terrorists develop chemical and biological weapons and electromagnetic methods that could create holes in the ozone layer or trigger earthquakes or volcanoes. T he devastating tsunami created December 26, 2004 by a magnitude 9.0 earthquake that killed more than 300,000 people on the shores of the Indian Ocean caught the world off guard. It was the largest earthquake since the 9.2 magnitude Good Friday Earthquake off Alaska in 1964, and ties for fourth largest since 1900. The Egyptian weekly magazine Al-Osboa An Australian researcher, Joe Vialls, Natural Earthquakes Most people consider earthquakes to be natural in origin, but what if there was such a thing as man-made earthquakes? Well, there are. There is the official version of what constitutes a man-made earthquake, and then there is a body of suppressed research pointing to a more insidious agenda. Artificially-Induced Earthquakes Officially, there is an area of research devoted to man-made earthquakes. Geologists and seismologists agree earthquakes can be induced in five major ways: fluid injection into the Earth, fluid extraction from the Earth, mining or quarrying, nuclear testing and through the construction of dams and reservoirs.

18. FEMA For Kids: Disaster Connection - Kids To Kids are the shaking, rolling or sudden shock of the earth’s surface. earthquakes happen along fault lines in the earth’s crust. http://www.fema.gov/kids/quake.htm

Shake With The Quake Story Rumble Tumble Story are the shaking, rolling or sudden shock of the earth’s surface. Earthquakes happen along "fault lines" in the earth’s crust. Earthquakes can be felt over large areas although they usually last less than one minute. Earthquakes cannot be predicted although scientists are working on it! Most of the time, you will notice an earthquake by the gentle shaking of the ground. You may notice hanging plants swaying or objects wobbling on shelves. Sometimes you may hear a low rumbling noise or feel a sharp jolt. A survivor of the 1906 earthquake in San Francisco said the sensation was like riding a bicycle down a long flight of stairs. Earthquakes are sometimes called temblors, quakes, shakers or seismic activity. The most important thing to remember during an earthquake is to DROP, COVER and HOLD ON. So remember to DROP to the floor and get under something for COVER and HOLD ON during the shaking.

19. Earthquakes Topic earthquakes release stress which causes permanent change in the Earth's crust. Note For further reference on earthquakes, please see SCEC's Regional http://scign.jpl.nasa.gov/learn/eq.htm

Earthquakes release stress which causes permanent change in the Earth's crust. Note: For further reference on earthquakes, please see SCEC's Regional Seismicity Education Module. What are earthquakes? Types of earthquakes Forces What causes stress? ... Earthquake activities References Bolt, B.A.1993. Earthquakes. W.H. Freeman and Company, New York, 331 p. Montgomery, C.W. 1990. Physical Geology, Second Edition. Wm. C. Brown Publishers, Dubuque, Iowa, 555p. Tarbuck, E.J. and F.K. Lutgens. 1984. Earth: An Introduction to Physical Geology, First Edition. Charles E. Merrill Publishing Company, Columbus, Ohio, 594 p. Last modified on 8/14/98 by Maggi Glasscoe ( scignedu@jpl.nasa.gov

20. Earthquakes | Livescience.com earthquakes are the result of plate tectonics, or shifting plates in the crust of Earth. http://www.livescience.com/topic/earthquakes

A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z

Page 1     1-20 of 104    1  | 2  | 3  | 4  | 5  | 6  | Next 20